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Old 05-16-2012, 06:39 PM
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I agree with cobalt, narrow pattern is best with some regard to pattern position. I'ts ok to have it on the outboard side of the valve tip providing its not too close to the edge. Shortening the pushrod in this case to get it to the center will only widen the pattern and increase outboard sideloading of the guide, create a bad pushrod and cup alignment when the valve is on the seat, and also not transfer the proper cam lobe action to the valve during the lift cycle. The problem is the position of the angles of the stud and valve. There is no industry standard. Even rocker arm distances from fulcrum to pushrod cup and fulcrum to roller tip is different between companies. Think about this, when you change the valve angle say from 23* heads to 17* and the stud angles stays the same the rocker roller tip with move on the valve stem.
Lou

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Old 05-16-2012, 06:46 PM
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Quote:
Originally Posted by Cobra720
The problem is the position of the angles of the stud and valve. There is no industry standard. Even rocker arm distances from fulcrum to pushrod cup and fulcrum to roller tip is different between companies.
Well said.
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Old 05-16-2012, 06:48 PM
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I dont like that roller so close to the edge. I would opt for a .050 shorter pushrod and give it a try. Not so worried about side load with a roller rocker, but would like that roller closer to center. You will also need to recheck rocker to spring retainer clearance, looks pretty close in your pictures. Keep messing with it, you'll get it!
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