Reply to "Header Bolts"

rockyMember

These aren't the stock bolts (of which I think I have a couple sets - PM me if you are interested... Also have NOS original headers in Ford Boxes). but... Here's an article I wrote for POCA newsletter...

Anti-Loosening Header Bolt Modification:

An easy way to keep your header attachment bolts from loosening up is to chuck them up on your lathe, and to machine the bolt heads so as to form an insert that fits into the header bolt hole but retains the flange on the bolt for seating.

Take your 3/8"-16 x 3/4" header bolt, and machine the lower half of the flange down from .550” to .430”. This reduced diameter will slip securely inside your header exhaust mounting hole.

The combination of the installed friction on the head, and additional friction on the newly reduced diameter head inside the header mount hole keeps the bolts snug. See the pictures below.

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11/24/248:41 AM

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