Quote:
Originally Posted by Marv D
I'd suggest you insert it DRY into the head,,, I try to resist the temptation to use teflon tape and such that can be detremental to the GROUND. Brass fittings do a really great job at sealing without any tape / sealing compounds.
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Partially true IMHO. Yes, brass does a good job of sealing. I've also had them leak without using tremendous torque. It can go either way.
Teflon tape will not affect ground. The Teflon only fills the voids. There is enough metal-to-metal contact to shave off the tape around 90% of the fitting.
The only exception to this would be for knock sensors on modern engines. Tape can affect the those since these connections are more mechanical to the block than electrical.
If you still don't believe me, scroll to the last page of this document. They tested sensor readings with and without tape.
http://www.lbfun.com/warehouse/tech_...eCF-Thread.pdf