5speed GT

as usual you are a great sorce of information. so there is no real need to pull the heads off to have them cut to 64cc if they are 65ish now.

AdderMk2

think of it this way. you have a lower than stock compression.... why not boost?

threeg502

The .2 point of comp is a tiny amount. Have you played around with your ignition timing? Differant
(newer) cylinder heads offer faster burn rates than past designs. You may have to run LESS spark advace to optimize the combo. Given to choice I'd take better airflow over that small amount of comp. My point is I wouldn't take the heads off my car for .2 compression.

88blackgt

boost it, 8.8 is almost ideal

2 kwik

it's not 30% use the total hp total it will be like 5%

JD1969

Did you have the heads rebuilt before you put them on? New valve job etc.? Also remember that judging if there was a performance gain "by the seat of your pants" is not going to tell you anything.

5speed GT

yea, I had a full valve job done with new FMS high lift prings

88blackgt

if you're going n/a, you're going to want it higher than 9:1. if you're going boosted you're going to want to stay way you are or go sliiiiiiightly lower. either way, i dont really think 9:1 is worth changing things for