Profiler27'

I have a 502 Mag MP that we freshened up a few moths ago and I went with a bigger cam , Crower lifters, and had the ecu re-flashed as well. My question is, how will it effect the valve lift and the valve timing if the push rods are a little on the long side? We marked the top of the valve and rolled the motor over and roller seemed to be traveling on the bottom side of the valve stem and when we checked the fulcrum (spelling) the push rods were top long according to the tool we used! Another question I have is how will this effect the over all performance of the motor, will I get the max lift of .542 on the intake valves and the .535 on the exhaust valves?

Thanks for the help,

blue thunder

It will side load the valve which will cause the guides to wear quickly. Your lift will be fine as long as its staying on the top of the stem.

Profiler27'

I was told by running a long push rod I would lose some valve lift, didn't know if anyone has run into this problem or not, thanks

jeffswav

Here is a article RMbuilder sent me when I adjusted mine. http://www.popularhotrodding.com/eng...variables.html

fbc25el

Go to www.mid-lift .com and that will explain everything.

Young Performance

The only way that you will change the amount of lift of the cam is to physically change the cam. If the pushrod is to long or to short, you will prematurely wear the guides as Blue Thunder said. You will still have the same amount of lift with the right pushrod or the wrong one. You really need to get it fixed.
Eddie

Panther

Or a 1.8 rocker arm instead of the regular 1.7, it will give slighly more valve lift. Gotta check clearances though.

I know some guys who are running 1.8's on the exhuast side to give a little more flow and act like a split duration cam on crappy heads.

Rookie

iTrader: (4)

I run 1.8's on my intake side for more lift, and 1.7's on the exhaust. This was done on a dyno and there were only gains for my setup on the intake side.

DORaymond

I believe if the geometry is too far off, you can change the effective lift of the valve due to the angle the rocker makes with the valve stem. Remember the rocker tip moves in an arc.

Panther

Nice!!