340 with 302 cast head for pickup

It takes all the info you put in, calculates it, and spits out an answer based on the input. If you have accurate data, it'll give a good answer.

I just used what I thought to be an accurate valve relief volume...if you have better numbers, please put them out.

EDIT: I think I see what's up with the calculator you're using...when it ask for valve reliefs, it expects you to put the valve reliefs as a negative number, but a dome is a positive number...the calculator I use is the reverse...so...