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George Maz · 02-07-2017

Pointed completely open to the exhaust valve. The curvature pointed as much toward the intake valve, it "shields" the plug from intake mixture for a supposedly better spark.
I've been considering "side-gapping" a set of plugs for my next change. It's a lot of work for a minimal gain of 2-3hp. Side gapped plugs will need to be changed much sooner as only the one side of the electrode gets consumed, thus drastically reducing plug life.

Also, came across some information on wide gaping the plugs...just for reduced emissions testing. No idea if it actually works. In NY, we are emissions exempt for 1990 cars, but other states differ.

02-07-2017	#2
George Maz Join Date: Dec 2014 Location: Long Island, NY Posts: 295	Re: Indexing LT5 spark plugs Pointed completely open to the exhaust valve. The curvature pointed as much toward the intake valve, it "shields" the plug from intake mixture for a supposedly better spark. I've been considering "side-gapping" a set of plugs for my next change. It's a lot of work for a minimal gain of 2-3hp. Side gapped plugs will need to be changed much sooner as only the one side of the electrode gets consumed, thus drastically reducing plug life. Also, came across some information on wide gaping the plugs...just for reduced emissions testing. No idea if it actually works. In NY, we are emissions exempt for 1990 cars, but other states differ. __________________ 1990 ZR-1 #1587 1990 ZR-1 #1727