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Old 03-01-2013, 03:26 PM
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BBC Piston I. D.

I'm changing out an older Herbert F/T for a retro roller cam in my T-Bucket, with no information on an earlier rebuild. Other than pulling the motor and dropping the pan to I.D. the pistons, I have no way of calculating my static c.r., if I can avoid pulling it, that would be nice.

It's a '67 396 passenger block, 3902406, stock bore and I was told stock pistons for that motor. The numbers have been milled off the front pad. The heads aren't anything to get excited about, 3904390's, I believe oval port 98cc, but I can measure them to verify that.

Crazy as it sounds, can anyone I.D. these pistons, and the volume, assuming they are stock '67's?

Thanks!
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Old 03-01-2013, 04:10 PM
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How tall are the domes?
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Old 03-01-2013, 04:45 PM
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Stock cast pistons. All 396 were dome. -17cc.
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Old 03-01-2013, 07:17 PM
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Thanks for the quick reply Bob.

Bowtie, the dome is about .188, which is probably .21cc, the piston has one valve relief, so I think Bob is right on at -17.

Great help, thanks again.
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