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*rage'nrat638* · 05-02-2007, 07:31 PM

yes vortec heads require a longer threaded plug or the plug is firing in the threaded hole and
not in the chamber where it's supposed to be

check the vortec's what to know in the FAQ section for the correct plug from AC DELCO that may be your problem

http://67-72chevytrucks.com/vboard/s...ghlight=VORTEC

Special Spark Plugs For The Vortec Heads
R44LTSM, set of 8
MR43LTS, set of 8
P526S Accel U-Groove “SHORTY” Double Platinum Header Plugs approximately 3/16" shorter then R44LTSM plugs, set of 8

05-02-2007, 07:31 PM	#19
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: could cam be wiped but are lifters ok? yes vortec heads require a longer threaded plug or the plug is firing in the threaded hole and not in the chamber where it's supposed to be check the vortec's what to know in the FAQ section for the correct plug from AC DELCO that may be your problem http://67-72chevytrucks.com/vboard/s...ghlight=VORTEC Special Spark Plugs For The Vortec Heads R44LTSM, set of 8 MR43LTS, set of 8 P526S Accel U-Groove “SHORTY” Double Platinum Header Plugs approximately 3/16" shorter then R44LTSM plugs, set of 8 Last edited by rage'nrat638; 05-02-2007 at 10:40 PM.