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efnfast · 05-01-2015

I hope Marc doesn't mind me quoting him. - In an e-mail he sent me.

"For high load operation I recommend a spark plug that is one AC heat range cooler than the OE plug. The best spark plug is the NGK TR7IX. Part number 3690.

It has a tapered seat. All LT5's are machined for both tapered and flat seat plugs. Carefully open the gap to .050"

Best of luck.

Marc"

05-01-2015	#3
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,580	Re: 1990 Spark plugs I hope Marc doesn't mind me quoting him. - In an e-mail he sent me. "For high load operation I recommend a spark plug that is one AC heat range cooler than the OE plug. The best spark plug is the NGK TR7IX. Part number 3690. It has a tapered seat. All LT5's are machined for both tapered and flat seat plugs. Carefully open the gap to .050" Best of luck. Marc"