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russcc · 08-19-2020, 06:58 PM

What I used in the Navarro heads were Champ L78Cs with a 1/2"reach. It left about 1 & 1/2 threads exposed which I countersunk to eliminate them. They don't hit the exhaust valves with a 1007B cam, that has about a .350 lift on the exhaust & .365 on the intake.
I used old stock Autolite plugs washers as they were thinner than Champs to position the plug so less thread were exposed.

08-19-2020, 06:58 PM	#5
russcc Senior Member Join Date: May 2010 Posts: 2,871	Re: AutoLite 216's in Offy heads What I used in the Navarro heads were Champ L78Cs with a 1/2"reach. It left about 1 & 1/2 threads exposed which I countersunk to eliminate them. They don't hit the exhaust valves with a 1007B cam, that has about a .350 lift on the exhaust & .365 on the intake. I used old stock Autolite plugs washers as they were thinner than Champs to position the plug so less thread were exposed.