colder plugs

[02fbody35th]

just wondering if any one is running a colder plug on a stock ls1 and if it would be ok to do so. I have been having a detonation problem at high rpms on hot days and was considering a cooler plug to get temps down. do you think this will help. i know i risk fouling the pluggs but it might be worth a shot if it will get rid of the horrible ping.

[JRENIGAR]

shorten the gap some ( 2-5 thousandths ). Maybe richen it up a lil, pull some timing, or get a colder t-stat.

[Firebirdjones]

shorten the gap some ( 2-5 thousandths ). Maybe richen it up a lil, pull some timing, or get a colder t-stat.

I do all of the above along with colder plugs.

Just be aware that ACdelco changed their part numbers around as well as deleting some. They no longer carry a part numbered plug for LS motors that signify a heat range. More of a one plug fits all crap so I avoid AC plugs anymore.

The NGK's never showed any significant heat range changes with EGT's on a dyno last time we played with those so I avoid those as well.

About the only plugs on the market that I care for and that actually offer various heat ranges that work (aka: showed consistent EGT changes) are Autolites. For a stock heat range on LS1's they call for APP104's which is a double platinum stock heat range.

Going one step colder would be APP103's. If you don't want the platinum plug and would rather have a copper core, then look at AR103's.

[mark21742]

I'm running the autolite AR103's gapped at .040"