Originally Posted by Bad66
I'm going to build a .060 over 350. I should hopefully have a set of federal-mogul .060 over flat tops coming real soon. I would like to get at least 9:1 out of this engine, BUT all I have right now is a set of those crappy 462624 76cc sbc heads. The pistons are rated at about 9.35:1 with 64cc. I know it's not alot at all, but if I used a thinner head gasket with the 76cc heads, how much do you think I could get out of it? Anyone have a gasket recommendation?
I plan to use the lunati 60103 cam. I have had awesome results with voodoo cams in the past, but I know this cam is going to need a little more than my usual 8:1. Please note, I am still in the market for a good set of 64cc heads, but my budget is a little tight on this one and using the 76cc heads is definatly not set in stone, but a possibility. Also I'm getting the pistons on a trade (they are brand spankin new and they are free), or else I would go with a domed piston. You guys give out some good info, even saved me from blowing money on something that wasn't going to work. Thanks for your opinions and bearing with my noob questions!
You're far better off to use a small chamber head with D dish piston and tight squish of about .04 to .06 inch. Big chamber heads have poor combustion, and domes make it worse. You can get power but it comes at the expense of a lot of 4 dollar gasoline.
As a short term fix you could run a .016 thick Fel Pro gasket which would deliver 9 to one if the block isn't decked, 9.5 if it is at zero.
I wouldn't start out to build an engine this way, but for free parts, there's plenty that can be done with a little added milling of the block deck and/or heads to make this work pretty good.
I didn't run a dynamic cr on this as it takes time to look up all the cam specs and run the calculator that I just don't have at this moment but go here with the data and get some results you want somewhere around 8 to 8.5 to 1. http://www.kb-silvolite.com/calc.php?action=comp2