dmiz0420

iTrader: (8)

Given: stock cam, if I mill my heads .040, would I need .040 shorter push rods?

would PR's that are too long cause ticking/oiling problems? What problems would they cause?

I know the way to be certian is to check wipe pattern and use an adjustable PR tool, but off the cuff or from anyone's experience....

Thanks!!!!!

experience and knowledge = wisdom
+ =

brad8266

iTrader: (23)

Yeah the rods would have to be .040 longer. I dont think long pushrods will cause oiling problems but it could possibly cause extra noise as well as too much preload on the lifter, which could lead to lifter failure which would then become noisy.

BriancWS6

iTrader: (18)

Theoretically, yes.

A noisy valve train is associated with in-adequate pre-load, which would be too short a PR. But remember, the stiffer valve springs commonly ran with aftermarket cams utilizing fast ramp rates will be noisier. It's just the nature of the beast.

Why are you thinking of milling heads without a camshaft swap?

FYI, the Comp XE-R grind cams have a base circle ~.050 smaller in diameter vs the stock camshaft, which would take away ~.025 pre-load. This would also come into play with PR length if you were doing a cam swap on top of milling.

dmiz0420

iTrader: (8)

do you mean 7.4 is .040 too long?

.040 shorter, ie 7.36 because the head gets closer to the cam, no?

am I not thinking of this right?

I do not have a cam .... yet.... but I'm trying to get my understanding correct to see if it's contributing to a noise.

actually the shims from the rocker arms are .050 so would that put it up to 7.41 from 7.36(from 7.4-.040) +.050shim?

Does .010 shorter 7.4 pr (if I'm thinking of it correctly)really make a difference?