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Old 03-04-2009, 04:09 PM   #1 (permalink)
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390 compression ratio

I am helping a friend build a 390 for a 63 1/2 galaxie. The build is going to be pretty mild but with good heads, headers intake and carb etc. Can anyone tell me what piston I need to use to achive a 10 or 10.5 to 1 compression ratio, using Eldebrock 76cc aluminum heads? I would like to put flat top pistons in it, but don't want to end up with 11 or 11.5 to 1 compression. Also what would be a good cam for mainly street use? (C6 transmission, not sure of weight of car 3600lbs?) Thanks for any help.

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Old 03-04-2009, 07:23 PM   #2 (permalink)
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Re: 390 compression ratio

Silvolite has quite a few choices for 390's

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Old 03-04-2009, 09:00 PM   #3 (permalink)
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Re: 390 compression ratio

You may find this link helpful, it's a compression ratio calculator.

Engine Compression Ratio (CR) Calculator
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