Not Ranked
The GM stop leak tablets for the Cadillac Northstar might be the best bet. We use the exact tool mentioned - a bolt head welded to a 1/2 drive deep socket, and we install them with teflon paste. Tried silicone but went back to the teflon. Still get a "weeper" on the dyno from time to time.
Seems like most OE ones I get in have signs of leakage too - rust stains from the plug...
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP
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