8.2:1 is way too low of compression in my opinion. We just had a car that was on the dyno with an si kit that was 10:1 and made some silly power too much for the stock block lol. I would ideally like to see your compression at 9:1. If you don't want to go with a custom piston which adds alot of expense then you could opt for the 9.5:1 piston and use a thicker cometic head gasket to lower to compression. With a .041 gasket my motor would have been 10:1 but with a .066 gasket I'm at 9.6:1 In my 91GT I have .120 gaskets to get the compression down to 9.5:1 since the heads have been milled so much.
It's all in the tune up. Higher compression just leads to more cylinder pressure which yields higher hp. You will make the same power with less timing with higher cylinder pressure. You will surely be able to make enough power with this combo to split a stock block so timing will be conservative anyway. Any good tuner will know and recognize the detonation thresehold and keep you safely away from it. At 9.4:1 you will be fine however I wouldn't mind it being a bit lower. If you don't already have the headgaskets just look to spend a few extra dollars on a better set of Cometics or MLS type gaskets to dial in the compression right to 9:1 if possible.
Jeff mine has the stock lower block stock pistons with almost 100,ooo miles sure im sure I push it but hell I push it on a stock block anyways I would re-ring you stock block..i mean like Nick said your going to make enough HP to split that block into pieces why spend extra money on really good pistons and still have a stock block..im no one to tell anyone what to do being im running 14 psi with my turbo set-up...yes I do run meth injection I use ARP studs and fel pro 9333 pt1s the reason I went with them was when doing my build I heard people saying the cometic gaskets were stronger then the blocks...lol..I wanted a fuse...if you know what I mean....
Oh Yeah Jeff I run the TFS 170 heads also mine are not out of the box ones tho..mine are fully worked bowl blended,better valves,ported and polished...etc etc...I bought them that way I got a great deal on them...I like these heads..they do have a tendency to make more noise at idle sounds a little like a sewing machine..lol..but that's ok..thats because the stud mounted not shaft style...I still even run the stock cam...lol...car makes tons of power and drives mostly like stock until you hit the go pedal....
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