Quote:
Originally Posted by 69a
When the exhaust valve is fully open there is less than 1/16" gap between the valve and the cylinder head. This means the entire plug is up inside the thread. I have seen some heads where a recess is cast into the combustion chamber. The Edelbrock combustion chamber pictured in my previous post has a CNC machined recess to allow for the electrode to extend into the combustion chamber without hitting the valve. The Edelbrock combustion chamber looks great, the other one, not so much.
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Only the latest Edelbrock are like that all earlier versions are more like the Navarro. I try to get the valve at .040 clearance to the cyl head. 55 plus years building these gems.
So what did Mike say about your plug fouling issues if he built the engine???