Originally Posted by MoonshineMattK
https://www.amazon.com/Time-Sert-M1...&hvtargid=pla-307461692358&psc=1

Spark plugs don't get heli coils. They get one piece threads. This is one style.


iagree If you're gonna replace the threads, use something like this. I wouldn't be replacing anything until it HAD to be done though.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax