spark plug question
Thread Starter
Joined: Dec 2004
Posts: 607
Likes: 1
From: Winter Haven, Fl.
spark plug question AFR suggests starting with an ac delco 41-974 spark plug. newer ls1's come standard with 41-985 plugs. question is, can anyone confirm these are the same plug, I think that the 985 replaces the 974? thanks in advance
