header torque
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Joined: Dec 2004
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From: Hemet ca.
header torque
What is the proper torque for headers on a 64 f100 with a 292 y-block? are headers the same torque as exhaust manifolds? what is torque for both? Thanks in advance.
Robert
Robert
More Turbo
Joined: Nov 2003
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From: Peoria, IL (more or less)
The factory spec for exh. manifolds is 23-28 ft. lbs.
That would be a good starting point for header bolts as well, as they are the same diameter & thread. The biggest issue with headers is to retorque them several times during the first week or two. If they are allowed to loosen & warp it will be very difficult to make them ever seal. Eventually they will take a set & stop loosening up so much.
I like to run a large flat file over the inside weld beads on the flange to true them up, & also make sure the ground weld bead is complete. Y headers are kind of a limited-build item by nature, but a lot of mass-production headers have gaps and/or pits in the ground bead.
If possible, it never hurts to run the file over the head port flanges too, or actually have a machine shop true them during a rebuild.
Hope it helps.
That would be a good starting point for header bolts as well, as they are the same diameter & thread. The biggest issue with headers is to retorque them several times during the first week or two. If they are allowed to loosen & warp it will be very difficult to make them ever seal. Eventually they will take a set & stop loosening up so much.
I like to run a large flat file over the inside weld beads on the flange to true them up, & also make sure the ground weld bead is complete. Y headers are kind of a limited-build item by nature, but a lot of mass-production headers have gaps and/or pits in the ground bead.
If possible, it never hurts to run the file over the head port flanges too, or actually have a machine shop true them during a rebuild.
Hope it helps.
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