The Ford Barn - View Single Post - Question for the guys running aluminum heads

jeepguy1948 · 07-08-2023, 07:32 PM

Actually I had done a measurement exactly as described above but forgot to include it. I came up with .60” .0625 being 5/8” that would be my guess. I found some information indicating that back in the day Edlebrock recommended a Champion plug (I’ll find the number somewhere and post it later) with .75” of threads. I bought a set of those plugs. I may be dumb but I’m not stupid so I screwed the plugs in 1/2 turn at a time and then rolled the motor over. The plug gap started to close before the plug was all the way in, so those plugs are a no-go.

07-08-2023, 07:32 PM	#8
jeepguy1948 Senior Member Join Date: Jan 2022 Posts: 721	Re: Question for the guys running aluminum heads Actually I had done a measurement exactly as described above but forgot to include it. I came up with .60” .0625 being 5/8” that would be my guess. I found some information indicating that back in the day Edlebrock recommended a Champion plug (I’ll find the number somewhere and post it later) with .75” of threads. I bought a set of those plugs. I may be dumb but I’m not stupid so I screwed the plugs in 1/2 turn at a time and then rolled the motor over. The plug gap started to close before the plug was all the way in, so those plugs are a no-go.