318 pistons

txstang84 , tanks!!

No, I do not intend to be na 11 sec terror!
lol

Just want a nice and "fair" 318 to go on roadtrips to meetings and ocasionally burn some rubber.

You calculated the EXACT same CR than the guys at Summits "help desk" (they just responded), I must be using their calculator the wrong way.
The calculator you used, is it available on the web?

I'm measuring my entire engine, as we have a lot of uncertainty and "guessing" down here.
For exemple, Brazilian Chrysler shop manual states deck height is of 0,01" with stock pistons, but up to now, I haven't found a single deck on my engine that measures less than 0,152"!!
That 9.6" blueprint height you mentioned, is it from the bottom of the cylinder to the top?
I guess thats an important measurement I must get, but haven't removed my pistons yet.

Would you mind showing me the data you put on the calculator, just so I can check what I'm doing wrong?

8,5:1 is already a lot better than our advertised stock CR, of 7,5:1, but is still a bellow the 9 - 9,2:1 I would like.

The cylinder pressure you mentioned, is it just because of the low CR?
Or there's something wrong with my parts selection?

Thanks again!