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XfireZ51 · 07-27-2020

I tried Iridiums and regular copper plugs using a .045? gap. However, I found that I was getting knock retard showing up even w stock timing Installed a set of NGK BKR6E plugs gapped at ..035?, no knock counts w stock advance +3-4*.
Let me suggest that when u do install plugs on a pre-405hp motor using plugs gapped at .045?+, make sure u scan it for knock before declaring it to be OK.
It very likely could be knock you won?t notice, but occurs randomly and is picked up by your sensor.
I found the area in the 2800-3600rpm/45-60kPa to be particularly sensitive.

07-27-2020	#29
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Re: Which Brand of Spark plug do you run?? I tried Iridiums and regular copper plugs using a .045? gap. However, I found that I was getting knock retard showing up even w stock timing Installed a set of NGK BKR6E plugs gapped at ..035?, no knock counts w stock advance +3-4*. Let me suggest that when u do install plugs on a pre-405hp motor using plugs gapped at .045?+, make sure u scan it for knock before declaring it to be OK. It very likely could be knock you won?t notice, but occurs randomly and is picked up by your sensor. I found the area in the 2800-3600rpm/45-60kPa to be particularly sensitive. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX