Updating an old thread for the new AC Delco plug link:go to this web page. AC Delco has posted there plug marking's for you to decode.
but here is a decode for you.
R - Resistor
4- 14mm thread
3- heat range
LT - Long reach, .715" (18.16 mm), Tapered Seat
T - Tapered Seat Shell Design
TS - Tapered seat with extended tip
LTS is a long reach tapered seat plug with a extended tip.
TS it a tapered seat plug with a extended tip.
you need the LTS as the TS plug will be too short. here is the link to the plug marking's. and the link to the AC Deloc home page. you can cross your plug over useing there on line catalog too.
hope this help's ya out buddy!
huck you dog, ya beat me! i guess i should have just not decoded the plug's for him!!! oh huck a 1/2", there is no 5/8th's, thread is marked like this-R23LS or R53LS.
2- 1/2" tapered seat
5- 1/2" gasket type
[This message has been edited by ilbl8 (edited 05-18-2001).]