Something else Bullet told me yesterday has me wondering if they know what their talking about. They say for p/v clearance that .060/.060 is ok. .060 sounds tight on exhaust from what I have been reading. Steve Morris says intake .050/.080 exhaust as minimums.I am way more inclined to believe Morris on this issue.

This.

Unless you put it in, measure it, test it, change it and test again, it is just a fruitless weedy discussion.

Thinking that the recommended centerline is actually the best centerline is a bit of a stretch, let alone argueing about 0.050", 0.200" or 0.050" over the nose methods, IMO.

My Com Cam instructions says to use over the nose equal amounts, fwiw.

Machine shop was busy, so i installed the exhaust valve, checking margin with blue dykem or whatever its called. Looked good to me as well as the install height being the same, so mounted the head back up and remeasured with checking springs. I get .051 on intake and .088 on exhaust. Cam is in at 105. Looks like the best i'm gonna do, but maybe a 1.5 rocker would get me a bit more clearance as Dwayne suggested. The valve events measured are as i stated before, intake open 29 close 57, exhaust open 71 close 29.5. The exhaust closing point is off by 4* not sure why as the other events are 1.5* different.

Intake atdc Exhaust btdc
0*-.082 0*-.120
5*-.057 5*-.097
6*-.056 6*-.092
7*-.051 7*-.090
8*-.052 8*-.088
9*-.052 9*-.088
10*-.054 10*-.089
15*-.070 11*-.090
I will install the roller springs and remeasure again with clay tomorrow.

Your golden with .050 intake and .080 on the exhaust, don't forget that the aluminum head will get taller when warmed up moving the valves further away from the pistons
Trust me on that, I know guys that circulate hot water through their engine builds that have seen and measure the difference It will get more clearance warm or hot, not less

Agree. The Comp lifter bore tool is good for centerline method where lifter diameter / roller size just needs to be the same on each side of max lift, but not good for open/closing events. For opening / closing events use the lifter that will be run.

The exhaust is closest before tdc. I don't understand the chart you posted. The piston chases the exhaust, it cant be closer after tdc. Once piston hits tdc they are going opposite directions. Are the ex number before tdc?

sorry for the confusion, i thought anyone would figure it out. the ex side should also be read from bottom to top to make things clear.

Interesting. I never saw a cam card with different rocker ratios. 1.6 on the intake and 1.5 on the exhaust.
0.430 x 1.6 = 0.688
0.430 x 1.5 - 0.645
Typically I had to calculate the lift for the ratio I am using if the cam card was for 1.5.

no problem just making sure.

Its cool, just want to be clear. The clay measure was kind of a bust. I measured .114 on intake and .122 on exhaust using clay. Not sure why, the clay is firm and not spongy at all. I'm done measuring. Its now time to get this back together. Thanks guys

So your radial clearance was good also?I know if the clay is laid too thick it will curl around the valve when pressed.

I had .060 radial. Didn't see any issues there.

That is exactly what I expected.

Those guys are sharp. I did try this last week, but my LSM spring pressure checker is too large to get a dial indicator in there. I will give that another try next week when i have some more time.

There is nothing wrong with clay, as long you don't over do it/ do it correctly. People use plastiguage don't they?