hey, after looking around at some of the N/A engines ive been contemplating doing the 086 head swap. But heres my question. Which would be better, a port & polished LD9 head running 10.5:1 forged pistons with a .020 overbore, or the 086 head swap running stock ratio pistons with a .020 overbore. I dont know much about the 086 swap so any and all feedback would be appreciated, thanks.

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What cr would stock compression pistons give you with the 086 head? I would like to know too. With 9:1 pistons a the 086 head with a final cr of 10:7:1 according to someones profile.

stock compression comes out to about 11.4:1 with an 086 head.



Cardomain|Myspace

whats better 9:1 with 086 head or stock cr with 086 head? Im going to be using nitrous in the future.

Daniel Noriega wrote:What cr would stock compression pistons give you with the 086 head? I would like to know too. With 9:1 pistons a the 086 head with a final cr of 10:7:1 according to someones profile.

I think I read that someone's profile too.


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"Youth in Asia"...I don't see anything wrong with that.

I'm not going through the math again, but I believe the 99+ pistons give an 11.7:1 CR and I do believe Minion is correct on the 96-98 pistons giving 11.4:1.


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"Youth in Asia"...I don't see anything wrong with that.

thanks for the info! Higher cr is better for n/a right? Im going to be using a nos in the future. Im going to run 93 octane.