Check My Cam Degreeing

yellow rose said

Are you checking your P/V with clay and the springs you are going to use? If not, you should be. You'll find the valves are closest at about 10 degrees ATDC. With clay you will also see radial clearance.

Running soft springs will show much less clearance than you actually have.

Click to expand...

If you have hydraulic lifters, if the lifters are not pumped up properly to take up all slack and to STAY pumped up, if you use even stock pressure springs then you will get larger P-V clearance readings than you will actually have once the lifters pump up in operation. In my mind, that is the worst of the 2 outcomes. So I would rather get a lower P-V clearance with light checking springs, and then if the number is satisfactory, then I would know that I will have at least that much. If I got too little with that method, then it is time to use another approach.

But hydrualic lifter behavior is a problem if it is not filled with oil first.....while in the engine, with the valve train assembled and the lifter on the base circle. (Man, what a PITB! If the P-V clearance is too little then there is oil all over the place!)

Regardless, with those pistons' valve pockets and the cam type with slower ramp, I would not expect an issue.