The Ford Barn

Charles Brock · 08-06-2013, 01:38 PM

I have a set of Edmunds 8ba heads with the large spark plug hole. What plug fits this? Thanks

Ol' Ron · 08-06-2013, 04:05 PM

These heads came with 14mm plugs, so some one fixed the stripped plug problem by using 18mm plugs, They should have 7/16 threads These heads have a relocated plug which allow the use of a power tip plug. Unfortunately that won't help you now. They also have a very high compression ratio about 8;1 on a 239 engine. The quality of the castings is very poor (Hard to weld)

James Phillips · 08-07-2013, 04:50 AM

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If I remember right, didn't they used to make 18mm adapters the 14mm plugs would screw into. I had a flathead Harley that had them. I pretty sure.

08-06-2013, 01:38 PM	#1
Charles Brock Senior Member Join Date: May 2010 Location: Rome, GA Posts: 120	Edmunds 8ba heads I have a set of Edmunds 8ba heads with the large spark plug hole. What plug fits this? Thanks

08-06-2013, 04:05 PM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,862	Re: Edmunds 8ba heads These heads came with 14mm plugs, so some one fixed the stripped plug problem by using 18mm plugs, They should have 7/16 threads These heads have a relocated plug which allow the use of a power tip plug. Unfortunately that won't help you now. They also have a very high compression ratio about 8;1 on a 239 engine. The quality of the castings is very poor (Hard to weld)

08-07-2013, 04:50 AM	#3
James Phillips Junior Member Join Date: Feb 2012 Location: Hartman AR Posts: 20	Re: Edmunds 8ba heads Sponsored Links (Register now to hide all advertisements) If I remember right, didn't they used to make 18mm adapters the 14mm plugs would screw into. I had a flathead Harley that had them. I pretty sure.