it appears my edelbrock 6089 performer heads have had an attempt made at one of the header bolts to be retapped, is there a certain method anyone knows of to repair/retap safely ?

The best method of repair is to have a Helicoil installed.

Put one of these in. A permanent repair that can accept continuous re-use of the fastener like tightenening headers when they leak and replacing gaskets. http://www.timesert.com/
Jim

I thought they were factory Heli-coiled when new from Edelbrock. I had a set that were.

-Mark.

mine definatley are not factory helicoiled, bare aluminum all the way


anyway, got a deal on a thread/tap set from the mac tools guy at my work.

smile.gif hopefully fixed soon

If the original alum threads are damaged, rethreading them will not let them hold the same amount of torque as if in original condition.

Therefore, you may have to install a thread coil, ie, Helicoil, or a threaded insert.

When drilling/tapping alum, there is an alum tapping oil one can use to prevent binding and breaking the tap. Makes working with alum like a hot knife in butter.

The Helicoil set includes the drill bit of the correct size, the Helicoil tap, the installing tool, and a set of thread coils. You supply, and must, a small punch and hammer to knock off the installing tab. By not doing so will damaged the bolt being used and the thread coil.