plug hole blow by

[smitty476]

After a recent blown piston I swapped out oem for 10-1 forged .01+ Pistons. Now I'm getting blow by on the front plug hole. So far I'm looking at save-a-plug helicol. Anyone ever tried this or should I just say fuck it and get a new head?

[RetroRob]

I'd try the helicoil, cheap and usually pretty reliable

[docmel]

Done a heli coil fix on spark plug hole. No probs

[farmall]

Remember to use the full barrel insert style and not any old "coil" insert kits on spark plugs in aluminum heads. I refuse to use "coil" inserts in my motorcycles and haven't since the 1980s. I like TIME-SERT but would use a modern Heli-Coil kit like below, You can find some on Amazon.

Example Heli-Coil bushing style kit.

http://www.stanleyengineeredfastening.com/news/heli-coil-launches-new-sav-thread-repair-kit