Quote:
Originally Posted by 77 TRASHCAN
Jay, didn't you build a 455 recently with V-Pro's? Could you tell us about how and why you set up your V-Pro's on that engine?
THanks
Jeff
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When starting from a pushrod that is a set length, adding .020” (as Rhaod’s said) to the length then checking the pattern with a pushrod checker is correct. If you’re starting out using a pushrod checker with no idea what the length may be, to get the actual pushrod length you subtract the .020” from the pushrod checker length. What Rhaods was suggesting was not wrong, they were just starting from a set pushrod length, versus starting with a checking tool. In other words, for finding what the operating contact pattern of the rockers with V series Rhoad's, one way you add lash to the length, the other way you subtract it.
Vpro’s have an extra shim in them to raise the plunger so they can be set with less lash than a Vmax. If you follow the instructions for Vpro and Vmax with their corresponding recommended lash settings the plungers operate at the same height for both the Vmax and the Vpro. With the combination of the shim under the plungers and adding the .020” lash on a Vpro the position of the plunger is pretty close to the same as a regular standard lifter with 1 turn from zero preload. In other words the pushrod length for a Vmax or a Vpro is the same as standard lifter. I never seen that a different length pushrod was required on a Vpro versus a standard regular lifter. A Vmax running a ton of lash to pass a vacuum rule of a racing class might take a different length pushrod than a stock lifter, but for most street stuff the pushrod lengths will not change from a standard lifter. You can switch to V series lifter and use all the same valve terrain parts as regular lifters use.