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)
 
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.
 
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