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Originally Posted by Half-Inch Stud
I owned a set of 7M5s and had the screw-in stud KEEN-SERTs installed. Nicely done & affordable.
Drill &Tap the EXH Flange end-holes (4 places) gets the 7M5s to Ram Air III casting parameters (aside from compression). Mine were the 2.11/1.77 combo. Good blower head.
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There are studs made with 1/2" X 7/16" to fit the press in style heads without using heli coils.
I have a set of the 7M5 heads for sale. Take offs of a 455. Hav the big valves with press in studs. No outer exhaust bolt holes.