Hello folks back again for another question For basically a stock 455 rebuild to 1970 Stage 1 specs (adding a TA 212 Cam), what pistons would be best? stock manifolds stage 1 heads, 69 cc stock Qjet stock intake Currently i have Speed Pro Hypereutectic (4 relieve notches) Pistons 30 over, or should i just stick to stock cast pistons 30 over? If your going to be rude and disrespectful, please dont reply, just looking for some honest help from a first time BBB guy.
Nah, we don't do that here... A stock rebuild will do just fine with cast pistons. For performance, we want to bump the compression up to where the factory really wanted it. Do a search on "actual 455 compression ratio" on the board here and should find some interesting reading. For a Performance, you want a forged piston, with a compession height (aka compression distance) of at least 2"... All the budget forged stuff and cast stuff is built off factory specs, which were purposely conservative, and leave the pistons way down the hole, in relation to the deck surface. JW
I hope that wasn't aimed at me as I did apologize for that. http://v8buick.com/index.php?threads/piston-and-rod-alternatives.346948/#post-2948182
Rob, grab a set of autotec pistons they can be custom made to suit your needs to get to zero deck for better compression. I think JW sells them or you can find them online and order them yourself. They are not much more than an off the shelf set and you get way better results. www.buyracingparts.com
What is the compression distance on those? More specifically, how much do you have to remove from the block deck to get to "zero deck"? Given that you already own them, it seems to me that cutting the decks (if within reason) to get proper squish/quench is perfectly acceptable. If you didn't already have 'em, my recommendation might be different.
