Re: Heli-Coil Usage

Posted by Owen_Dyneto On 2010/10/19 10:33:00

Many years ago I stripped a stud thead in a 1954 359 block because I didn't realize the aluminum head was thicker than the replacement cast iron 327 head. I had a friend who worked for United Engine Rebuilders and their advice was a device called a Tap-Lock as I remember. It required drilling out the damaged thread quite large, perhaps 5/8 or 3/4, tapping with an NPT pipe thread, screwing in the adapter, and finish filing flush with the block. Whether it was the best or correct solution, it was a permanent repair.