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tubman · 09-18-2021, 10:29 AM

There is one exception in aftermarket heads. Edmunds (at least the three sets of 8BA's I have) have the sparkplug relocated just enough so that it clears the exhaust valve and allows the use of extended tip plugs. I have had a set of them milled and machined down to have .050" clearance over the piston on the '51 Merc in my club coupe for the last 5 years and am very happy with them. The car has required no maintenance and runs fine. I am very satisfied with the performance (it also has a 2G and a Mallory dual point). One of these days, I may get around to installing a set of seat belts so I can take it to "Run what ya' Brung" at BIR to get an actual time.

I believe "Ol' Ron" has touched on the relocated spark plug in the other thread currently running.

09-18-2021, 10:29 AM	#9
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,320	Re: combustion chamber design There is one exception in aftermarket heads. Edmunds (at least the three sets of 8BA's I have) have the sparkplug relocated just enough so that it clears the exhaust valve and allows the use of extended tip plugs. I have had a set of them milled and machined down to have .050" clearance over the piston on the '51 Merc in my club coupe for the last 5 years and am very happy with them. The car has required no maintenance and runs fine. I am very satisfied with the performance (it also has a 2G and a Mallory dual point). One of these days, I may get around to installing a set of seat belts so I can take it to "Run what ya' Brung" at BIR to get an actual time. I believe "Ol' Ron" has touched on the relocated spark plug in the other thread currently running.