ReubenH

EJ207 Block + EJ20R heads

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Yup, sorry, another thread. I've been searching all night for this one though, cause I know it's been done, but I can't find ****. Call it mondayitis affecting my judgement...

So I'm buying a V7 EJ207 shortie from subaru, and slapping my 20R heads on it, I need to know the finer points

Are there issues with valves and pistons?

Are there issues with compression ratios?

Anyone know what thickness headgaskets I need?

The heads have been planed once, when they were rebuilt first time, I do not know how much has been taken off (I can't imagine much at all, they were only 100,000k old and died of big end, not head gasket)

Again, sorry for all the new threads and my ineptitude at search. I am continuing my search though.

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Gazzy bopped v3/4 sti heads on a ej207 v7 sti shortie 9 months or so ago and scottspeed/dwight had a few posts on it also. Guessing those heads would be similar but that sheet of head/block specs would set you right.

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The table reckons 8.3:1 compression, but I don't know to believe it or not. And yes, v3/4 STi and 20R heads are essentially the same bit of metal, the difference is only what's bolted into them. I'll hit gazzy up on it.

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I'd say you would be roughly 8.4:1 with the v7 sti head gasket and 7.8:1 with the v3-v4 sti head gasket. Try and find a 1mm head gasket to get you right about 8:1

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2500+ shipping, or upwards of 2500?

That's not a bad price if it is; considering what it is.

That's an assembled short block?

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Assembled short block with new oil cooler and oil pump. No shipping as I'm getting it down here on the dealers normal freight. I think that is trade though, I did mention where I work when I called up for it.

It's literally slap the heads on, and timing gear, and away you rock. This build will literally be half the price of my first PBMS build, and will offer better drivability. It won't be able to handle 25psi on the track like my PBMS block could though (not that I ever had a chance to do that (the 25psi part)), and that build also included things like ARP headstuds and a baffled sump. But this engines going in a GT, not a rally car, so woopty doo. And I'm swapping the baffled sump and ARP studs over anyway.

Edited by ReubenH

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On 18/10/2014 at 6:28 PM, ReubenH said:

e price of my first PBMS build, and will offer better drivability. It won't be able to handle 25psi on the track like my PBMS block could though (not that I ever had a chance to do that (the 25psi part)), and that build also included things like ARP headstuds and a baffled sump. But this engines going in a GT, not a rally car, so woopty doo. And I'm swapping the baffled sump and ARP studs over anyway.

 

Hi All 

  • I am replacing my EJ20R short block in my 1996 Legacy RSB because it overheated quite substantially. We currently believe the engine needs a new headgasket maybe more.
  • I have also placed an order at Winger Subaru for a EJ207 Short block kit (10103AB470K) however it is most likely the V8/9 STI one as I was informed that they weren't sure if they could source a V7 STI EJ207 Short block. I will chase them up to get a definitive answer.  
  • I am still hoping that I can get a V7 EJ207 short Block.
  • I know that the pistons are different between V7 and V8,Will the hypereuthectic pistons be reliable and suitable for my application below?
  • I am personally only going to keep it as a street car.
  •  
Edited by Bobby

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