1970 340 has the 1973 low compression pistons

RustyRatRod said
It's no problem. All "THAT" aside, I can tell you this for sho and for certain......

REGARDLESS of opinions, if you blueprint this engine to a measured ratio of somewhere north of 10:1 with iron heads and that small cam, you will very possibly end up with some detonation issues.

That's why I recommended the lower compression pistons.....well that and because you already have them. To me, on a street car, the almost two points of compression are not worth the possible detonation issues. .......PLUS with the lower compression pistons, 9.5:1 is within your grasp with some mild head milling. That saves dough from new pistons and keeps compression more friendly.

But hay, you seem intent on pushing the envelope, so push away! I wish you luck. You can do it. A lot of people do. Hell, I did it with my slant 6......but I won't do it again. LOL

Thanks RRR, alot of my reasoning is that I don't want to deck the block or shave the heads too much or at all if I don't have to. I don't want intake fitment issues and being a stock bore block that's been sitting around since 1975 it shouldn't have many miles on it or core shift like when the cam journals get crooked.
Thank you for all the input, its very appreciated and like I said I am waiting to talk to the machinist who just might tell me the same as you bud. He is very respected and puts out some really awesome stuff. S&S Performance in Farmingdale, Maine, look them up on facebook and check out Steve Clukey's duster 340 he built, it's a screamer. A little bit pricey though lol...........Thanks again