Accessory Bolt size - BBC

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10-31-2005, 04:22 PM

72Shark

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Accessory Bolt size - BBC

What size bolts do I need for BBC cylinder head accessory bolt holes? Thanks.

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10-31-2005, 05:30 PM

BBShark

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St. Jude Donor '05-'07

I think some are 3/8-16 and some are 7/16-18. Mine are 7/16 but they are aftermarket heads.

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10-31-2005, 05:44 PM

PolishMike

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Quote:

Originally Posted by BBShark

I think some are 3/8-16 and some are 7/16-18. Mine are 7/16 but they are aftermarket heads.

yep, on my zz502 3/8 16 for some and 7/16 for others. Stock aluminum GM heads.

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