toolmanmike said

I haven't read through this whole thread yet but aren't the open chambered 360 heads going backwards? Wouldn't #302 or a closed chamber 273 head be easier to build compression and quench? I think porting small chamber heads is a better idea than milling open chamber heads to get your 9-1 ratio. You mill the heads and the intake won't fit without milling and the two will always have to be used together.

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• on the heads: You wouldn't mill heads to get 9-1 compression ratio. You would mill to get some of what your loosing back. If the op wants 9-1, better do all the measurements and math or you won't know.
• Next, and I am saying by experience, I've never, ever put cut 360 heads on a 318 and lost performance. Flow trumps compression any day of the week and twice on Sundays :D . Bigger valves and ports would be a sure win.
• Also, from my personal experience, I've never cut an intake when cutting heads .040 or less. Never. And, I've never had an issue or leak.
• 302 heads will do compression justice only because they are closed chambers. Never, in stock form, will they have a chance with flow vs. 308. Yes, you can fully port the 302's and add bigger valves and get some good flow.