If you are comfortable with pulling the heads, timing belt, oil pan, and various other things, then installing pistons is a snap .
I'm not sure how much power the increased compression would give you. My guess is 20-25 hp. A S-AFC might be necessary to tune the car more on the safe side.
I can get you forged pistons at 11:1 compression, rings, and pins for less than $800.
The non turbo cars are not extremely difficult to work on. You will have to go to an auto machine shop and have the rods removed and installed on the new pistons. This will run you around $100.
i think that jeff lucius worked the compression issue out once before... his formula said that the gain would be very negligible (7 HP). however, the bore increase might help a bit, too.
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