Help Choosing the Right Headgasket

[Croustibat]

Originally Posted by Dillinja666

No that small of a bump in CR will not be noticeable in spool and will just hurt your timing to control knock later on.

also stock pistons are 86mm not 83. the 87mm gasket will be fine.

It is a CA, bore is 83mm.

If you are going big turbo, get LESS CR right from the start. The important thing about HG is how clean and flat ALL surfaces are. If the block is not flat either, then you are just throwing money in the bin.

[Rustys14]

Originally Posted by Croustibat

It is a CA, bore is 83mm.

If you are going big turbo, get LESS CR right from the start.

Response is more important to me then power because of what I want to use the car for, which is why I was thinking about upping the compression a bit. I'm not going to be running a huge turbo or a lot of boost so I figured a small bump would be fairly safe. Based on some of the responses I think I'm going to stick with the factory CR though.

[Kingtal0n]

Originally Posted by Croustibat

It is a CA, bore is 83mm.

If you are going big turbo, get LESS CR right from the start. The important thing about HG is how clean and flat ALL surfaces are. If the block is not flat either, then you are just throwing money in the bin.

This, and, the inverse also applies to some extent, low-rpm small turbo daily drivers should get higher compression ratios for better fuel economy.