660 high compression

[hypersnyper6947]

those of you who run high compression pistons in your 660's is there any need for HD studs or anything like that, also what is stock compression ratio

[raptor686boi]

hey, I run a stock bore high comp piton in my Raptor 660 and no you dont have to have better cylinder head bolts, I have been using my stock cylinder bolts with it and its been doing just fine.

& the stock Compression Ratio is 9.2:1

chris.