What the highest possible Compression ratio possible using 91-94 octane.. and still being reliable... What can be done do increase compression.. and still keep it as reliable as possible.. What else can be used other then a thinner headgasket....

 

u can run 12.1-12.5 depending on how much timing u run. it depends.

 

you can shave the head, swap the pistons, or use a thinner gasket.