Fit the biggest diameter pushrod you can, on any application, regardless of cam specs. This is the race section, not street.
We run a 7/16, double taper, .135 wall pushrod with our Tigers, and we still do not get full lift (could also be the aluminum rockers, but that is another issue)
Yes, it takes a while to clearance the pushrod hole. You must check it through the entire range, rotate the engine twice to make sure it clears every where. .010 - .020 clearance is good.
Even though the pushrod is not breaking it IS flexing, which means you are not getting all the lift out of the cam, thus, losing power.
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1978 Pontiac Grand LeMans.......out next year
Previous - 2001 Jerry Haas-built P/S Grand Am - former WJ car, Hoffman Racing 535" IA2, Tiger Heads/Intake, Single Dominator, PG
Best ET: 7.776 @ 175.94, 1.096 60', 2375 lbs.
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