Join Date: Dec 2000
Location: Monroe, WA, USA
ok i have vortec head's, GMPP recomend's you use MR43LTS or MR44LTS, you can also use the R43LTS or R44LTS. if you like the rapid fire plug's use the #3(inplace of the R44LTS or MR44LTS), use the #9 (in place of the R43LTs/MR43LTS).
here is the decode or the A/C Plug's so you know what you are getting.
M=Marine application plug, it has a silver plating on it and make's it easyer to read the plug. all rapid fire are silver plated non-marine plug's are black.
4= 14mm plug thread
the 4 and 3 are the heat range, larger the number the hotter the plug
L= long reach plug, this is for the long threaded plug hole in a vorted head.
T= tapered seat
S= Extended tip, best for performance and econamy. this is what GMPP and A/C Delco say's. so do other expert's on plug's.
hope this help's ya out.
[This message has been edited by ilbl8 (edited 04-22-2001).]