Re: Spark Plug Protrusion into Head?
I've used Edmond heads on several of my builds. unfortunately they have a very small combustion chamber ofer the valves to give hi compression on the 239 block. True 8:1 CR milling the eads for .045" piston to head clearance and a power tip plug will make these small engines run quite well
As for the ignition systems, A high output coil isn't necessary. Considering the fact that we never exceed 9:1 a stock 12v ignition is all you need for complete combustion. However, when the spark occurs is important. I was afraid to cut the heads for the L-100 lift and used the Max #1, which also keeps low end torque. If your interested in a very good street engine a 259 with Edmonds head and Max #1, is one of them
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