Joel & netters Aluminum is not too soft to hold onto plugs if they are torqued properly. I have completed more tune-ups on aluminum head engines than I can remember, and never had a properly torqued plug back out. The secret is to use Permatex Antiseize on the plug threads, and install at the recommended 20 ft# of torque. Only if the threads are worn out, or some of the original threads have been pulled out by removing plugs in the past will you run into problems. To properly helicoil threads is alot of headache, aggravation, and possibility of getting metal into the engine if done with the heads installed. Protect and prevent, is better than repair.
Colin & Bev Rainey KR2(td) N96TA Sanford, FL crain...@cfl.rr.com http://kr-builder.org/Colin/index.html
