What is the usual gain in horsepower by porting/polishing the head on an otherwise stock B16A2? Also, is a half point increase in compression noticeable?

TIA

 

Anyone with back to back tests with unported/ported heads?

 

.5 gain in compresssion wint really give you much.

you could gain some power by doing a nice valve job and doing some blending of the throats/top cut/ combustion chambers. pretty much just improving on the flaws

 

mmuller,

Shall clean up the casting flaws and perform some bowl work as you suggested.

I have a first gen B16A with auto cams and am planning to install a set of B16A2 manual cams and valve springs. Since the compression is 10.2 compared to the B16A2's 10.4, I was thinking of shaving the head 0.020" in order to increase the compression......what do you suggest? Should I leave the compression as it is?

TIA

 

pull the middle layer out of your new headgasket if you want to raise comp. dont mill unless it's your last resort to raise comp.

 

yes as hybridvteceg sayd, milling is the last resort for gaining compression.

.2 will not make a difference in power, i would just leave it as is.

 

OK I wont mill the head and go with a thinner gasket instead.

Thanks guys!