Valve stem hight question????
Valve stem hight question???? I have a set of ported 799 heads that I installed some 2.00/1.55 Manley Race Flow/Pro Flow valve in. After the install I noticed that all of the intake valve stems are about .025 lower than the exhaust valve stems. I know I will need to measure for pushrod length again. Should I just make make up the difference in pushrod length to retain correct lifter preload?
Last edited by poltergeist 02; Mar 23, 2013 at 01:32 PM.
no, it's a factory valve job. I think I figured out what is going on though. the 45* cut on the stock valve is much closer to the bottom of the valve head than the manley valve. I may have to take pics to better explain.
Last edited by poltergeist 02; Mar 23, 2013 at 10:24 PM. Reason: missing info
Just use different pushrods, it won't hurt anything. The pushrods do not change rocker geometry like it would in a stud mount rocker system. I did the same thing with my engine.
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Verdad Gallardo Thanks KCS for the responses. I just didn't want to bolt the heads on only to find out I have to pull them back off and buy new bolts and gaskets. How far off were your valves from intake to exhaust?
Not 100% sure, but I used pushrods .025" different to get the preload right.
The pushrods won't change that, moving the rocker's fulcrum is what would though. The LSx stuff has a shaft mount rocker system that's bolted down, so the only way to move the rocker's fulcrum is shims or milling the stands.
Just curious but if you run into a problem like this couldnt you just grind the valve tip down a bit to make them all level? I just had some heads done at a shop and was curious to know what you usually do when you encounter this...
this topic nearly ever comes up so I think its interesting..
this topic nearly ever comes up so I think its interesting..
Yes I have heard of thiss but it can be limited by the hight of the retainer to the tip of the valve stem.