EJ20G heads on an EJ22T

[drewriviera]

I was looking at putting my 91 Liberty RS EJ20G heads on my EJ22T block. I know that it drops the compression quite a bit (from the compression chart on the website) Is it easy to get compression out of these heads by shaving them? I know some heads are easier to get a point or two out of than others. I am about to have the engine out and would rather not dive into the short block if possible. I thought I saw where someone had put these heads on without doing anything else to them and I thought they got a power increase, but I could be wrong...could anyone that has actually done this swap tell me? I also would think you would have to get adjustable cam gears to degree in the cams after doing this.

[PhyrraM]

There were posts many years ago about this swap. Yes, the compression would be really low. Some posters said that it was hardly noticeable. I, personally, would try it - all you lose is time and a set of head gaskets.

If the engine is being rebuilt, a set of custom pistons would put your compression anywhere you want. If the motor is not being rebuilt, a swap/trade for an EJ257 shortblock would yield both more power and a better compression ratio.

Yes, shaving the heads would move the cam timing. It would move it 3 times as far on the left bank - leaving a 'unbalanced' motor.

[cj91legss]

I did the swap with 20H heads, stock pistons oem gaskets, I honestly feel like I have no off boost power at all.

[Legacy777]

These would help. Depending on how much the heads have been shaved, you still may not get everything back in alignment.

http://store.crawfordperformance.com/store/products/566