Longer pushrods to get rid of tapping?

[ascdesigns]

So I've read somewhere on TRS that since our rockers aren't adjustable, the only way to take out slack in the valvetrain is to replace pushrods with very slightly longer ones. I believe it may have been Big Jim M. He also suggested that it's rare that a hydraulic lifter would go out at 120K miles therefore the pushrod replacement may be the logical route.

Given that, I was contemplating the possibility of doing just that: lifting the valve covers and replacing the pushrods that had clearances. Or maybe all of them.

My questions to the Vulcan 3.0 experts are: how long are the stock pushrods (5.340" ? or 5.328" according to NAPA) and what length are the slightly longer ones I should get. Big Jim M suggested the longest ones that Ford offers, but when I called a few dealerships all of them only stocked the, well, stock length whatever that is.

Can anyone help?

Thanks,

Al

 

[kryptonitecb]

You could just measure the gap at tdc or your preferred method. Then pull out the rod to determine what the total length is.

Sent from the road while ignoring traffic

 

[McCormack]

Hydraulic lifters are mechanical items and thus they can fail at any time. To me it seems bazaar to be considering installing longer push rods to correct a lifter problem - if it were me I would isolate the offending cylinder and replace the lifters and be done with it before I'd go messing around with longer push rods.