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I ran the Shelby heads for a number of years. I've had a rocker stud pull out on two separate occasions. One of the heads always weeped a tiny bit of coolant from one of the screw-in plugs. Now those heads are in the corner of my shed. One day I'll take them to a scrap dealer and cash them in.
Keith Craft built a set of Stage II Edelbrock heads for me and shipped them to the engine builder I've used for years, Leggett Engine Research. Mr. Leggett liked the combustion chamber of the CNC'd Edelbrock's quite a bit more than my Shelby heads.
I also changed over from Shelby roller rockers to a set of Erson rockers. I just fired the engine with this new set-up about 8 weeks ago. Life is good again.
David
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