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Head Bolt Head Size


James_Douglas

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Can anyone tell me what the original head bolt head wrench size was on the flathead six ?

I have an engine with head bolts with head sizes in 11/16, 5/8 , and 1/2. They are all head bolts with the under cut shaft and all the original 2-13/16 inch length.

I ran across a guy that has some 7/16 -14UNC head bolts that are three inches long with the OLD Chevy 5/8 head on them. I will be getting a price later today. They are not making them anymore and they are not in their catalog. But they are sitting on 1000 of them...and I may be able to get some cheep.

Thanks, James

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Thanks guys.

The '49 head bolts are a mess and a mix of types. I guess Automotive Engineering did rebuilds in the early 1960's and played mix and match with the head bolts.

The folks that sell the Chevy bolts, Pioneer Auto, stopped making the 5/8 head size bolts some time back for the SBC and just do the 1/2 head size bolts now and that is the part number you will find in the forum archives.

They have about a 1000 of the 5/8" head version but it is not in their system. I contacted them about selling me about a 100 of them. I should have flathead head bolts for the rest of my days !

If anyone else wants any when they tell me how much and how to pay for them, I will let you know.

Best, James

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