<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by 68blkbrd:
Picked up a Comp Cams pushrod checker. I would like to know when to go longer or shorter with the pushrod length depending on the contact pattern on the valve tip. Example: if contact pattern is towards rocker arm do I go shorter or longer? vice-versa? My former engine builder screwed up and put two differnt sizes in my engine .050 difference. I have H.S. 1.5 roller rockers. Thanks for your time. </div></BLOCKQUOTE>
That may or may not be a screw up by your previous engine builder. If the cam lobes are different (not a single pattern cam) then it is possible the intake and ex. pushrods are different lengths.
The roller tip needs to be on the inside 1/3 of the valve stem at 0 lift. Throughout the lift you need to inspect the roller tip and see where it rides. It should go about to the same position on the outside 1/3 of the stem at about 1/2 lift, and at full lift it should come back towards the center of the stem.
If the tip of the rocker is too close to the inside, them the pushrod is too short. If it starts too close to the outside edge, the it is too long.
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