When I got the new shortblock from keithcraft and got to install the rocker shaft I did come into problems.
This is what I wrote keith:
Quote:
Dear Keith,
I was trying to adjust the valvetrain today, and have noticed that the pushrods you sent me (Smith Brothers NH34A-EB) are too long and that I can not adjust them properly because they do touch the rocker body even when the set screw is all the way turned out. So the pushrods are allways under preload. I can not raise the Dove rocker arm assy because it allready touches the valve cover at both ends, needing some grinding down.
The only solution is to use shorter pushrods, something like 1/8 to 1/4 less.
The pushrods you did send me are unused so I can send them back to have them changed against some shorter ones.
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Keith did send me 0.250 shorter pushrods and all was well. For some reason the "correct" pushrod lenth is not correct and at least with the bulky aluminum rockers a shorter pushrod is the way to go.
I believe that this is one of the main issues when aluminum rockers break.