If you have AFR 185's and big cam please read

ZarnAutomotive said:

I got a 347 with a nitrous cam and 185's I need to know what length pushrods are you running, the stock ones are to short, I also have stud mount rockers

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Michael Yount said:

Zarn - what we're trying to tell you, gently, is to stop 'guessing' and get (or make) an adjustable pushrod so you can optimize the length for proper valve train geometry. You want the tip of the rocker to stay as close to the center of the valve stem throughout it's travel as possible. A light test spring on the valve for the mock up makes things easier - and use grease or dye/ink to see exactly where the tips are hitting. There has to be some movement from center - the arc of rocker movement requires that - ideally it should start slightly inside of center, swing to slightly outside of center at mid lift, ending up back slightly inside of center at peak lift. Other's pushrod lengths won't help your combination - when you get to this level of dimensional detail, every combo - including those with 'identical' parts, is different. With your symptoms, you clearly have something that is way wrong - measure and work the problem. No need to guess at it.

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