Need ideas to raise compression

[BigBoy]

I want to raise it slightly since i will be on 91 pump gas

jdm b16
P30 pistons
1 layer HG

so according to the c-speed calculator..im at 11:1

How much will it increase if i throw in some flat valves like skunk2 or supertech?

Since ill have to remove the head, should i go with an oem 1 layer again or a mugen/spoon gasket? I want to be at 11.5 max compression.

 

[reikoshea]

personally i wouldnt go higher than 11:1 on 91 octane...i dont think the valves will get you any extra compression...the only thing i got is shave the head (i think thats what the process is called)...but its not advisable.

 

[powerdriverh22]

flat valves will only yeild you about .3 if ur lucky. if your oging to spend that kind of money just buy some high compression pistons....if you have a standalone you can go higher than 11:1 compression, im going to run 12.1:1 on 93...higher octane is better, so really i wouldnt go above 11:1 if you dont have access to 93

 

[CiViC_SOHC]

My buddy has 12:1 I think on his b-series...he runs pump gas as well runs strong except for his blown HG right now lol.