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jerryst

06-13-2018 03:13 PM

thread size?

On my ford 312 cylinder head on the driver side it is missing a screw in plug. This plug is located on the rear of the head near the intake port. Anyone know the thread size?

thanks

Jerry

bjmayberry2

06-14-2018 09:24 AM

It’s a course thread 1/2 or 9/16s. It’s not the thread size that’s the problem it’s the length. If the bolt is too long it hits the push rod. Leave it out and it will blow oil out of the hole.

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