Short block swap

[Tourer V chaser]

Hi guys im kinda new here. i drive a toyota chaser Tourer V JZX 100 from 1997. i am now running a 2.7 litre custom forged stroker ($9000) custom order from jun. a big T51H HKS turbo with custom equal length headers and 50mm HKS SS external wastegate. A huge FMIC with 100cm lenght 45 cm height and a 4inch core thickness. A HKS F-CON fuel computer and a AEM engine management. i am tuned in at abou 500 WHP. i have a verry interesing question. will the supra shortblock (the 2JZ GTE) fit on my head, the supra utilizes the same stock bore. i have my stock head available but i want to go 3l. but my 1 JZ GTE wont permit me to go that far since i dont like a stroke increase. is is possible that the stock 1JZ GTE head would bolt straigt onto a 2JZ- GTE shortblock. please advise me cuz my aim is 1000HP on my chaser. and achieving that would be way easier with a 3 litre engine.

[bgrieger]

Many parts are interchangable, and the block is one of them. Also commonly refered to as a 1.5JZ. There's no one here running it that I'm aware of, but there are a few on supramania.com and supraforums.com.

Bob

[SuprAdam]

Yes it will bolt on.

[kamesama980]

wait...you want to go from 2.7l to a 3l without changing the stroke or bore???? please tell me i missed something and this isnt what youre saying

[TcmaBoy]

Originally Posted by kamesama980

wait...you want to go from 2.7l to a 3l without changing the stroke or bore???? please tell me i missed something and this isnt what youre saying

He has a 1JZ which is normally a 2.5L I6 that has been stroked out to 2.7L. He wants to use his 1JZ head on a 2JZ block. The 2JZ is a 3.0L I6 block. As Bob said this is called a 1.5JZ.

I have always wondered if the 2JZ crank can be used with a different rod to stroke out the 1JZ.

The qusetion would be why would you swap a 1JZ head to the 2JZ block rather than simply swaping over the whole motor? The only thing I can come up with is that he wants to keep his current turbo set up. The 2JZ head has different porting than the 1JZ head, so his manifolds will not fit the 2JZ. Rather than starting from scratch he can swap the 1JZ head over and continue to use his current turbo set up.

[SuprAdam]

Most people say the 1jz head flows better than the 2jz.

Whether or not that is true I don't know. That is why the whole 1.5jz thing started.

[bgrieger]

As I've been told by one of the most knowledgable 1j owners, the head thing turned out to be a myth, but not a significant one.

[Tourer V chaser]

The reason hy i want to keep my current head is because of my extensive head work. and the thing that the 1JZ head flows better than the 2JZ head is not a myth. I college it was my final stidie project. the thermal effeciency, flow characteristics flow speed, turbulence of the flow all exeed the 2 JZ engine. the only thing in wich the 2JZ is more superior is a amount it can flow in a calculated time. I also want to keep my turbo setup beacause my T51 BB turbo can easily make a 1000 on a high boost setting. what injectors would you guys advise on a 1000HP setup and should a ditch my MAF and run MAP and what other usefull advise can i get from you guys o make my tourer V one of the worlds most powerful.

[Jeeves]

Originally Posted by SuprAdam

Most people say the 1jz head flows better than the 2jz.

Whether or not that is true I don't know. That is why the whole 1.5jz thing started.

Originally Posted by bgrieger

As I've been told by one of the most knowledgable 1j owners, the head thing turned out to be a myth, but not a significant one.

Actually, it was very significant. According to recent testing the 1JZ head barely flows better than the 7M head. Simple comparison of the 2JZ head -vs- the 7M easily shows where the 2JZ has some of it's gains. The intake and exhaust runners are huge, the valves are (IIRC) 2.5mm oversized from our own, and so on and so forth.

I wish I could strap a 2JZ head on my 7M.

Originally Posted by Tourer V chaser

The reason hy i want to keep my current head is because of my extensive head work. and the thing that the 1JZ head flows better than the 2JZ head is not a myth. I college it was my final stidie project. the thermal effeciency, flow characteristics flow speed, turbulence of the flow all exeed the 2 JZ engine. the only thing in wich the 2JZ is more superior is a amount it can flow in a calculated time. I also want to keep my turbo setup beacause my T51 BB turbo can easily make a 1000 on a high boost setting. what injectors would you guys advise on a 1000HP setup and should a ditch my MAF and run MAP and what other usefull advise can i get from you guys o make my tourer V one of the worlds most powerful.

No, it's a HUGE myth. Recent flow testing slapped it into the faces of all those that believed it.

/goes digging for the proof.

[Tourer V chaser]

today i purchased my 3.0l 2JZ GTE short block that allready has a 3.2l JUN Stroker with cosworth rods ( abopu $11000) with polishing and porting competition bearings etc. i think ill preform the install tomorrow. are 1000cc injectors with 2 bosch 200 psi fuel pumps, a AEM fuel pressure regulator, AEM high flow fuel rail and a HKS F-CON fuel computer enough to supply my 1000HP fueling needs??? The head im putting on is fully tuned with high lift camshafts (11.3) lift and a 272 deg duration IN and a 285 deg EX profile. Mainly gen oversize valves the head is ported polished. HKS adjustable cam pulley's. and im going to drop compression to 8.7 via a thicker gasket. and what type of spark plug would you advise since ill be running a 200 shot of direct port NX.

[SuprAdam]

Originally Posted by Jeeves

I wish I could strap a 2JZ head on my 7M.

Thats for sure..

Stock 7mgte stock valve size:
int. 197 cfm @ .400" valve lift
exh. 141 cfm @ .400" valve lift

Key to the 7M is porting the valve seat. Really the only spot for gains...