Engine Porn: Os Giken Tc24-b1z

Granted this is not the first time we have looked at the OS Giken’s TC24-B1Z, but seeing it’s further been refined from last year’s Nostalgic 2 Days show, I thought I’d dedicate a little post to it as it’s simply, a work of art. It was back in the late seventies that Okazaki-san from OS Giken decided to convert what was then one of Nissan’s most popular engines, into a true high performance powerplant. High power and high rpm were two of the main goals for the project, which was all based around an aluminum twin-cam head design. Combined with a reworked bottom end of their choosing, customers would really tap into the true potential of the L-series. Only 11 OS Giken TC24-B1 heads were created, demand was low due to the high cost but it was quickly regarded as the ultimate modification for Nissan’s popular straight six.

But seeing the continuous growth in popularity of the kyusha in the last few years, Okazaki-san was persuaded to offer a few more of these special heads to his most demanding customer. So from the middle of last year OS Giken began taking orders for the TC24-B1 head, except Okazaki-san was not exactly going to be recasting a design he created over thirty years ago. What he did was go back to the drawing board and refresh the whole design of the DOHC head, using better materials and modern technology.

One of the main changes are the cam caps. These 2-piece items used in the newer “Z-version” not only reduce friction, but are shorter than the bulky 1-piece round items that were implemented in the original design. Furthermore for 2013 the whole lower structure of the caps has been changed with a more complex and rigid design. Valve adjusters have also been changed from screw type to bucket & shim, helping lower mass and make the engine rev more freely.  And since the new head allows more revs now, cam and rocker lubrication has been altered for better performance at all engine speeds. One of the options that is being offered is the gear conversion that replaces the chain drive distribution system…

…with a series of cams. This has quite a few benefits, first of which it eliminates the slack chain systems have, as well as guaranteeing reliability at high rpm. Seeing this engine spins to 10,000 rpm, that’s a good thing. Cams not only sound nice but as you can see are actually quite compact and OS Giken offers a very nice billet aluminum cover that, to those in the know, will hint something very special has been done to this motor.

This particular engine is one of their development motors and runs the best components and options that OS Giken offers like a forged and counter balanced crankshaft, H-section connecting rods and oversized pistons. The increased stroke, 86 mm over the stock 79 mm and the bigger piston diameter of 89 mm, bump capacity to 3,208 cc. For those that opt for this complete engine OS Giken will also revise the oil circulation with better jets and fit a crank case reinforcement plate to keep the internals from torquing the vintage block. On this latest version of the complete TC24 engine, an ATI crank damper is also fitted to keep harmful crankshaft harmonics at bay.

Drive is sent to the transmission via one of OS Giken’s clutches and lightened flywheel.

This engine breathes through Weber carbs but can also be converted to fuel injection if the customer so requires.

The TC24-B1Z of course also comes with optimally designed intakes…

…although these stunning dry carbon trumpets are still a prototype part. As it stands this engine can churn out 420 HP at 9,000 rpm and 392 Nm (289 lb/ft) at 8,000 rpm thanks also to the increased compression (11.5:1 vs 11.0:1). With the improvements in design the red line has been raised 1,000 rpm to 10,000 rpm compared to the original TC24 head.

Here is a quick look at the equal length stainless steel headers the complete engine comes with…

…a six-into-two design. All of this makes the TC24-B1Z one of the best sounding straight-sixes of all times!

The complete package is topped off with a large billet aluminum oil sump and extended pick up. Nine of these wonderful motors have been built so far and since Okazaki-san can’t ever stop fiddling around with this beast I am sure this isn’t the last iteration of the engine we will see. Dry sump lubrication next maybe?

OS Giken

Nostalgic 2 Days 2013 coverage on Speedhunters

-Dino Dalle Carbonare

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197 comments

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1

Oh.      MY.        GOD.

2

Oh.      MY.        GOD.

3

Oh.      MY.        GOD.

4

Oh.      MY.        GOD.

5

MY Z HAS TO HAVE ONE.  TAKE MY MONEY NOW.

6

MY Z HAS TO HAVE ONE.  TAKE MY MONEY NOW.

7

MY Z HAS TO HAVE ONE.  TAKE MY MONEY NOW.

8

MY Z HAS TO HAVE ONE.  TAKE MY MONEY NOW.

9

Oh Lawd. Love at first sight!

10

Oh Lawd. Love at first sight!

11

Oh Lawd. Love at first sight!

12

Oh Lawd. Love at first sight!

13

I don't think I even want to know the cost of this beast. It's gorgeous.

14

I don't think I even want to know the cost of this beast. It's gorgeous.

15

I don't think I even want to know the cost of this beast. It's gorgeous.

16

@butcher__51 Ez alul vezérelt felül szelepelt lenne?

17

@butcher__51 Ez alul vezérelt felül szelepelt lenne?

18

@butcher__51 Ez alul vezérelt felül szelepelt lenne?

19

@klarky75 Hát mindig keverik hogy mi az alul/felül vezérelt, szerintem a szelep nyomó excenterek felül vannak ezért felülv. de tökömtudja :D

20

@klarky75 Hát mindig keverik hogy mi az alul/felül vezérelt, szerintem a szelep nyomó excenterek felül vannak ezért felülv. de tökömtudja :D

21

@klarky75 Hát mindig keverik hogy mi az alul/felül vezérelt, szerintem a szelep nyomó excenterek felül vannak ezért felülv. de tökömtudja :D

22

@butcher__51 Én úgy látom lent van a vezérműtengely és fent a szelepek, abból gondolom.Minden esetre szép nagyon,szobadísznek is beillik :-)

23

@butcher__51 Én úgy látom lent van a vezérműtengely és fent a szelepek, abból gondolom.Minden esetre szép nagyon,szobadísznek is beillik :-)

24

@butcher__51 Én úgy látom lent van a vezérműtengely és fent a szelepek, abból gondolom.Minden esetre szép nagyon,szobadísznek is beillik :-)

25

So are they planning on making more parts???  This and the twin cam L20 where amazing sounding engines.

26

So are they planning on making more parts???  This and the twin cam L20 where amazing sounding engines.

27

So are they planning on making more parts???  This and the twin cam L20 where amazing sounding engines.

28

so remember when you guys did the weekly survey of NA or Turbo...?         now THIS is NA!!!  :D      and that compression ratio is getting awefully close to modern sportbike ranges!

29

so remember when you guys did the weekly survey of NA or Turbo...?         now THIS is NA!!!  :D      and that compression ratio is getting awefully close to modern sportbike ranges!

30

so remember when you guys did the weekly survey of NA or Turbo...?         now THIS is NA!!!  :D      and that compression ratio is getting awefully close to modern sportbike ranges!

31

Pinnacle of the L-Series right here. This is what I wish to have in a Hakosuka

32

Pinnacle of the L-Series right here. This is what I wish to have in a Hakosuka

33

Pinnacle of the L-Series right here. This is what I wish to have in a Hakosuka

34

tell them the price son!!!id pay just to hear this thing run , would sound amazing

35

tell them the price son!!!id pay just to hear this thing run , would sound amazing

36

tell them the price son!!!id pay just to hear this thing run , would sound amazing

37

Curious as to why they didn't use a tri-y setup on the headers. What's the firing order of the motor?

38

Curious as to why they didn't use a tri-y setup on the headers. What's the firing order of the motor?

39

Curious as to why they didn't use a tri-y setup on the headers. What's the firing order of the motor?

40

@JSequoia Just to play devils advocate: the torque of the TC24-B1Z is ~289 lb/ft tq from what I could find. To compare the two out of curiosity I found a page with an SR20 that used a turbo to produce similar peak power levels as the TC24 and found this:
 
 http://www.evans-tuning.com/dynos/2010/11/s13-nissan-built-sr20det-400whp355tq-powerfc/
 
From 4750-6000 that motor (SR20) is capable of producing over 350 lb/ft tq and the overall curve of both power and torque look really nice. All the mods plus the motor would come out to around the same I would guess when all is said and done. This is definitely a badass NA motor and I would be interested to know the weight of it compared to a turbo SR20 and how low it could be mounted in a car like the 240Z. Either way, I want to hear the sound it makes.

41

@JSequoia Just to play devils advocate: the torque of the TC24-B1Z is ~289 lb/ft tq from what I could find. To compare the two out of curiosity I found a page with an SR20 that used a turbo to produce similar peak power levels as the TC24 and found this:
 
 http://www.evans-tuning.com/dynos/2010/11/s13-nissan-built-sr20det-400whp355tq-powerfc/
 
From 4750-6000 that motor (SR20) is capable of producing over 350 lb/ft tq and the overall curve of both power and torque look really nice. All the mods plus the motor would come out to around the same I would guess when all is said and done. This is definitely a badass NA motor and I would be interested to know the weight of it compared to a turbo SR20 and how low it could be mounted in a car like the 240Z. Either way, I want to hear the sound it makes.

42

@JSequoia Just to play devils advocate: the torque of the TC24-B1Z is ~289 lb/ft tq from what I could find. To compare the two out of curiosity I found a page with an SR20 that used a turbo to produce similar peak power levels as the TC24 and found this:
 
 http://www.evans-tuning.com/dynos/2010/11/s13-nissan-built-sr20det-400whp355tq-powerfc/
 
From 4750-6000 that motor (SR20) is capable of producing over 350 lb/ft tq and the overall curve of both power and torque look really nice. All the mods plus the motor would come out to around the same I would guess when all is said and done. This is definitely a badass NA motor and I would be interested to know the weight of it compared to a turbo SR20 and how low it could be mounted in a car like the 240Z. Either way, I want to hear the sound it makes.

43

Taking the valve cover off this beast is like removing the top off your favorite stripper. It just brightened up your day!

44

Taking the valve cover off this beast is like removing the top off your favorite stripper. It just brightened up your day!

45

Taking the valve cover off this beast is like removing the top off your favorite stripper. It just brightened up your day!

46

@SPEEDHUNTERS That's a different, smart feature. Like it.

47

@SPEEDHUNTERS That's a different, smart feature. Like it.

48

@SPEEDHUNTERS That's a different, smart feature. Like it.

49

Piece of art !

50

Piece of art !

51

Piece of art !

52

You wouldnt want to get your tie caught in in those gears when your leaning over checking the timing!

53

You wouldnt want to get your tie caught in in those gears when your leaning over checking the timing!

54

You wouldnt want to get your tie caught in in those gears when your leaning over checking the timing!

55

@urpleCigarillos Damn...

56

@urpleCigarillos Damn...

57

@urpleCigarillos Damn...

58

Guys what are the springs attached to the exhaust pipes for?

59

Guys what are the springs attached to the exhaust pipes for?

60

Guys what are the springs attached to the exhaust pipes for?

61

just to hold the parts of headers together, it's fairly common in motorcycles.

62

just to hold the parts of headers together, it's fairly common in motorcycles.

63

just to hold the parts of headers together, it's fairly common in motorcycles.

67
speedhunters_dino

No need for flanges...

68
speedhunters_dino

No need for flanges...

69
speedhunters_dino

No need for flanges...

70
speedhunters_dino

No need for flanges...

71
speedhunters_dino

There are covers of course....

72
speedhunters_dino

There are covers of course....

73
speedhunters_dino

There are covers of course....

74
speedhunters_dino

There are covers of course....

75
speedhunters_dino

@danjapan13 Porn or art, or both LOL

76
speedhunters_dino

@danjapan13 Porn or art, or both LOL

77
speedhunters_dino

@danjapan13 Porn or art, or both LOL

78
speedhunters_dino

@danjapan13 Porn or art, or both LOL

79
speedhunters_dino

@hanablemoore Good thing I categorized this as engine "porn" haha

80
speedhunters_dino

@hanablemoore Good thing I categorized this as engine "porn" haha

81
speedhunters_dino

@hanablemoore Good thing I categorized this as engine "porn" haha

82
speedhunters_dino

@hanablemoore Good thing I categorized this as engine "porn" haha

83
speedhunters_dino

@scibO I have no idea...I was afraid to ask!  Same as 2-3 new FR-S? Or 4...;)

84
speedhunters_dino

@scibO I have no idea...I was afraid to ask!  Same as 2-3 new FR-S? Or 4...;)

85
speedhunters_dino

@scibO I have no idea...I was afraid to ask!  Same as 2-3 new FR-S? Or 4...;)

86
speedhunters_dino

@RyanKuan They do a gear conversion for the S20 too.  But year, 420 NA HP in a hako would be sweet!

87
speedhunters_dino

@RyanKuan They do a gear conversion for the S20 too.  But year, 420 NA HP in a hako would be sweet!

88
speedhunters_dino

@RyanKuan They do a gear conversion for the S20 too.  But year, 420 NA HP in a hako would be sweet!

89

Un-frickin'-believable. I'm almost glad I don't own a 240Z anymore; I always want the best for my cars, and I couldn't afford this in my wildest dreams! I'm glad they're building them again, and that it's a fresh new design to boot!

90

Un-frickin'-believable. I'm almost glad I don't own a 240Z anymore; I always want the best for my cars, and I couldn't afford this in my wildest dreams! I'm glad they're building them again, and that it's a fresh new design to boot!

91

Un-frickin'-believable. I'm almost glad I don't own a 240Z anymore; I always want the best for my cars, and I couldn't afford this in my wildest dreams! I'm glad they're building them again, and that it's a fresh new design to boot!

92
speedhunters_dino

@JSequoia It's all about character I think :)

93
speedhunters_dino

@JSequoia It's all about character I think :)

94
speedhunters_dino

@JSequoia It's all about character I think :)

95
speedhunters_dino

@zackspeed333 Well they make pretty much everything lol, but you never know. Love OS Giken!

96
speedhunters_dino

@zackspeed333 Well they make pretty much everything lol, but you never know. Love OS Giken!

97
speedhunters_dino

@zackspeed333 Well they make pretty much everything lol, but you never know. Love OS Giken!

98

@speedhunters_dino  @scibO  I read somewhere that it was at least the cost of an FR-S, yes.

99

@speedhunters_dino  @scibO  I read somewhere that it was at least the cost of an FR-S, yes.

100

@speedhunters_dino  @scibO  I read somewhere that it was at least the cost of an FR-S, yes.

101

Thanks for the porn, I mean, pictures Dino!

102

Thanks for the porn, I mean, pictures Dino!

103
speedhunters_dino

LOL

104
speedhunters_dino

LOL

105

it's a six cylinder motor....

106

it's a six cylinder motor....

107

Perhaps i didnt read well enough, but is there a sump system that keeps the gears lubricated? id imagine theyd get pretty warm at 10k RPMs

108

Perhaps i didnt read well enough, but is there a sump system that keeps the gears lubricated? id imagine theyd get pretty warm at 10k RPMs

109

@speedhunters_dino  is there proper video of this engine installed in a car & on track somewhere?

110

@speedhunters_dino  is there proper video of this engine installed in a car & on track somewhere?

111

Who wears a tie when checking timing?

112

Who wears a tie when checking timing?

113

@Bridges
 Barney Stinson of course

114

I used to have a gear drive set-up in my 383 SB Chevy, sounded fantastic. I wonder if there's any whine or noise similar with this gear-driven set-up.

115

@JSequoia  That sounds like the old power output from the original project.  From what Dino was saying they redesigned the whole thing and I would not be surprised at all if it churns out big numbers. I think Dino needs to keep up with this so we can see a dyno video or even in a car. Want to hear this thing.

116

That is just perfect !!

117

@speedhunters_dino
 clear covers be a dream! :D   ...though the whole engine is so purposeful, i'd have hard time adding vain aesthetics... (queue the internal battle)

118

@speedhunters_dino  DId they have pricing on this particular motor?

119

I want one of these! Birthday please!

120

@speedhunters_dino Engine porn is just like the other porn . It gets you going and most women dont understand it or its purpose.

121

What is the tooling cost to create your own head. I mean molds, foundry cost, the materials used, and even the prototype. I wonder how much did it cost him from the first 1 he made to the most recent version?

122

oh my lord. everything on this engine is just beautiful, the carbon stacks, the huge fuel rail, and by god those headers are so sweet.

123

So how many are they planning to make? And will the head be available as a standalone?
 
Jesus Christ that is awesome.

124

Come on lottery!!!

125

@Sumo_Power Engine-gawping. Good for our collective health

126

I'm aware of that, but you can't make a tri y for a straight 6? I know they are used in V8s and I had trouble finding information about header design for 6 cylinder motors. Figured I'd ask.

127

@zackspeed333  @JSequoia No doubt Dino. This motor is something special and it's rarity makes it something to be collected as well as a performer on track. I was just bringing up the point since it was relevant to the NA v. Turbo discussion. 
 
I wouldn't be so quick to say this thing is churning out huge power figures like 600-700bhp, but I would like to know what it is making / see a dyno video and chart. Very cool motor and an interesting story none the less.

128
speedhunters_dino

@aussieANON I think nine is what they were shooting at.

129
speedhunters_dino

@zamm333 There is no fuel rail, it's got carbs.  You mean the water pipe on top of the headers?

130
speedhunters_dino

@hanablemoore No idea on costs but it can't bee too cheap!  Castings are the same as the old head but head processing, squish all of that is new design

131
speedhunters_dino

@voloeverto787b Nope but if you are interested all you have to do is mail them for a quote.

132
speedhunters_dino

@FunctionFirst There is

133
speedhunters_dino

@ericbauer Not that I know of

134
speedhunters_dino

@Ben Scales Yes they are lubricated once the covers are closed

135

this. must. sound. Like heaven itself...Wow, that amazing work. I've heard of retrofits and restorations. But seeing new technology complimenting old technology is quite cool

136

@JSequoia Though i think the numbers the tc24 are posting are using carbs. Many L series guys have found more power switching to EFI. With a set of OER ITB's im sure its simply a matter of tune.

137
speedhunters_dino

http://www.youtube.com/watch?v=2LC_4J1MmRU
 
This is what the original TC24-B1 head conversion sounds like...

138
Nick_Suruga_Performance

Awesome writing!!!

139

I believe the original TC24 engine was tested (one fitted to an S30) against a 911 and beat it in everything except top speed.  Which gearing was set low to begin with anyway.  I wonder why they didnt use O.E.R. carbs?
 
 
perpetualroad.wordpress.com

140

More HQ pics please

141

@speedhunters_dino  @scibO  IIRC, according to Z gurus, this head was never technically out of production, but was built by request only and had a price tag of $12,000 back in the 1990's.  So, the cost of an FR-S is a fair estimate.

142

@speedhunters_dino I don't know shit about economics but wouldn't it make it more cost effective to make more of them?
They're still going to make a shedload of money whatever they do.

143

I think you mean a series of gears instead of cams.

144

@SPEEDHUNTERS time well spent!

145

@speedhunters_dino oh shit, haha yeah that is what  I meant. its my background and i was staring it it for like a solid minute before i was like oh wait, carbs. and its on the hot side of the head ... thats not a fuel rail. okay well then its by far the best looking water pipe ive ever seen.

146

@kanandasurya itu bukan bokep jirr -_-

147

1-5-3-6-2-4.

148

That thing is absolutely sexy! :)
I'd love to see more tech-related aritcles in the future :)Greetings from Germany!

149

@speedhunters_dino  @hanablemoore I imagined you don't need tooling like you used to, you could cnc machine it out of a lump? I think as it's a supply and demand issue they can charge what they like due to the rarity :)

150

Love, love, love the way you shoot man. It's decided, first chance I get I'll have to get another Z.

151

@Zeus That is a tri y design, of sorts. Every straight six goes 1-5-3-6-2-4. 15-too young. 36-too old. 24-just right.

152

p0rnormously awesome

153

p0rnormously awesome

154

p0rnormously awesome

155

mechanical art

156

mechanical art

157

mechanical art

158

Karts use them too.

159

@MannyManiac  @Zeus Yeah it is, but in the sense I was thinking of. I was wondering why they don't combined the two pipes into 1 to help scavenging. I'm familiar with the design in V8s and I know NASCAR engines work best with the Tri-Y design, but obviously thats a V8 not a straight 6.

160
speedhunters_dino

@MannyManiac Thanks man!

161
speedhunters_dino

I'm trying to bring more each month. Glad to know they go down well!

162
speedhunters_dino

@aussieANON Well as basic economics would tell you its all about supply & demand. While people love these things there aren't many out there that would fork out quite so much for them so for most it's just a bit of a dream :)

163
speedhunters_dino

@shconer Cam gears?

164
speedhunters_dino

@zamm333 You aren't wrong there. Not wanting to sound like a weirdo but I actually fondled that pipe for a while and I was blown away at the quality of weld and how smooth it is inside. Only OS Giken can make a damn pipe look and feel so sexy!!

165
speedhunters_dino

@zamm333 You aren't wrong there. Not wanting to sound like a weirdo but I actually fondled that pipe for a while and I was blown away at the quality of welds and how smooth it is inside. Only OS Giken can make a damn pipe look and feel so sexy!!

166
speedhunters_dino

@RussTaylor  @hanablemoore Yep and they do. However I'm pretty sure they don't have a CNC machine there

167

@speedhunters_dino For sure, but things get cheaper to make when there's more of them around.  Recouping R&D costs is difficult but if lots of units are sold (lots comparative to 9) then the R&D cost per unit drops dramatically.
I just want more produced so I can possibly hear some

168

Great shoot and article thumbs up! amazing engine.

169

What an engine! When you see a harmonic balancer especially an aftermarket unit you know whoever built this knew what they were doing...reliability is key.

170

@hanablemoore  @speedhunters_dino Right...

171

@speedhunters_dino  @shconer These are called scissor gears

172

Perhaps I am confused. "One of the options that is being offered is the gear conversion that replaces the chain drive distribution system with a series of cams." Should the last word in that sentence not be gears? As your suggesting their scissor gears not cams. @r0taryh3ad @speedhunters_dino

173

@shconer  @r0taryh3ad  @speedhunters_dino Shconer is right.  What Mr. Carbonare was referring to are "gears," or more specifically "timing gears", but not "cam gears" and certainly not "cams".  A cam is something that turns rotary motion into linear motion (e.g. the cam lobes on a camshaft).  A gear is a toothed wheel.

174

Gorgeous... but all those tiny bits are terrifying.

175

@speedhunters_dino  @voloeverto787b 
 
 
Pricing is about $30,000
 
 
When you consider an LY series crossflow motor (which is actually the most sought after, not the S20) would be literally impossible to buy, that's quite cheap. LY motor is super cool, if you could do an engine porn on one of the ~11 ever made you'd make my 2013.
 
Just for reference, one of the Z guys in Japan (mats- something, memory escapes me), had bought a complete LY motor ~30 years ago for $60,000 USD from a private racing team running them.
 
 
So this motor really is a bargain. You'd spend about that trying to make 340whp out of an L series.

176

@speedhunters_dino  @voloeverto787b 
 
If anyone wants some names or sources to back that up i'll spend a while trying to find them..

177

whats the advantage of having a all the headers an equal length apart from not only looking amazing and sounding great?
ive had many explanations but not a proper one!

178

@shconer  @r0taryh3ad  @speedhunters_dino  I actually work for a company that produces these ETG for F1 teams. They are very good as there is little backlash in the teeth so it allows for very precise timing with the added bonus of no slippage so can be run at higher speeds. Very expensive though...

180

@thriller  @speedhunters_dino  @voloeverto787b 30 grand. WoW i thought it was gonna be around 17 or 20 grand. If thats true about it being 30 grand im mounting that engine next to my couch in my living room, behind 3 inch bulletproof glass, with my two kids doing twelve hour shifts guarding it. I understand why people pay that much because of the rarity. i just cant take a chance on putting in my Z because these people out here where i live cant drive and are accident prone.

181
HeathvanderWaerden

Water outlet manifold above the exhaust ports? These guys have done their homework. There is a lot of over-the-top fiddly stuff that is just mechanically impressive (engine porn) and doesn't really need to be there, but this is DAMN good none-the-less.

182

Cams are the things driven by those gears. They're called "gear-driven cams"
 
Difference.

183

@BSFL89 #MechEng #FTW #EnginePorn

184

@jenny_hinton Stuff like this is what I thought I'd do.

185

@BSFL89 then do it

186

@jenny_hinton Haha I am working on it.... well add it to our beer discussion. Built a motorcycle that was featured in a mag before.

187

this is the kind of stuff i could read all day

188

Anyone know where to get carbon trumpets like these from?

189

That's very, very sexy. If I built that I don't think I'd ever be able to stop looking at it...

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420hp !!!… any sound and / or vision of this ( the NEWER version) engineering artwork running in a an appropriate vehicle? This is just gorgeous !

191

love the idea! but im shure it would suck to adjust the clearance between the gears if you ever had to resurface the head or deck the block.

192

Yeah, great! HTF do I buy one??

193

So how do I buy one of these?

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I want a 2JZ version :)

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Hi I need some this Engine please contact to me 00968 95729559

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How much did this build cost?

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