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Old 01-31-2013, 01:58 PM
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Whenever I convert early Dbl Hump heads to screw-ins I touch off and remove .400 from the bosses.

The other thing to look at are rockers with a wider slot below the trunion area.

I've also seen rockers where people have chamfered the inside edge of the slot slightly to clear the radius of the stud to avoid tearing everything back off the motor.
BSE Racing Engines
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