Join Date: Mar 2012
Location: Axton VA
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i dont beleive adj. push rods are needed for this cam...typicaly they are only needed when you are installing the bigger cams,,,
Let's clear a few things up.
Are/can OEM pushrods be used: Yes, with what's called a "bolt in cam". Usually a cam less then .515-520" in lift.
Are OEM pushrods recommended: No.
Adjustable pushrods are recommended for 2 reasons:
1.) When installing an aftermarket cam, the ramps have sharper drop-offs due to higher lift and duration, which equates to more valvetrain noise. Setting the pushrods to .140-.150" into the tappet bore keep them quieter then just the .100" adjustment OEM rods are set at, preventing this. As well, the tappet bore can change with different head gaskets or cam cone bushing placement. Anything less then a .100" depth in the bore is gaurenteed a tappet making a ticking noise.
2.) It's easier and cheaper to cut the old stock pushrods out and put in EZ-install pushrods, then it is to yank a gas tank(s), and pull apart 2 rocker boxes and regasket them, just to remove and reuse OEM pushrods.
The cost of the gaskets is half the price of the pushrods in most cases, and if the person is paying labor to have the job done, it'll far exceed the cost of the pushrods just in the added labor.
Without adjustable pushrods, you'll be pulling rockerboxes every time you need to undo a pushrod, for any reason. Waste of time....and money.
The tappets on Evos commonly will see the front cylinder, exhaust tappet ticking first as they get older, as it's the farthest from the oil pump, and on a harder angle then all the others. Replace the the tappets if installing a new cam, AND the INA inner cam bearing with a Torrington B-138 bearing. The ticking can also be a failing tappet, or worse yet, a failed INA inner cam bearing, allowing the inner cam race to drop, causing the front exhaust tappet to start to make noise, due to lack of proper lash/depth.
It's important to check and clean your tappet screen as well.
i have a question and it may sound silly i suppose but you are saying to seat the pushrods deeper in the lifter to advoid tick correct....but from my understanding at higher rpms where you get pump up on the lifter (where the oil pressure builds to the point where the lifter pumps up and by doing so holds the valve open not allowing it to close fully) wouldnt you want the pushrod on the shallower end of the lifter??
Yes, but only in high RPM situations. Especially for what you're looking to do, you can add limiters if that's the case.
S&S makes them, as do a variety of other companies.
A high percentage of the people don't need them and never will. Running the tappets at .140-.150" depth is pretty much industry standard, with no ill effects.