noob valve spring question

The simple way to see if the cam is even close is pull the drivers side valve cover and roll the engine over until you are on OVERLAP of number 1. That is 180 degrees from TDC on the compression stroke.

Click to expand...

My apologies to YR for misinterpreting his “180*”.

I read this as him saying the overlap was 180* from TDC.

I know when I saw this, it sure seemed like he was saying, turn the crank 180*.

The overlap isn’t at 180* from TDC, it occurrs while the piston is in the vicinity of TDC.

So, The answer to my post 31 is...... if all those conditions are met(timing set dot to dot, single pattern cam, symmetrical lobes, installed with no advance/retard), the cam is exactly at split overlap at TDC.
Both valves are open exactly the same amount(well..... actually, both lobes are at the same amount of lift).

The pic of the T-set was to illustrate that when the dots are lined up correctly, the crank key is pointing towards the piston being at TDC(not 180* from TDC).

One possible issue with trying to gauge the accuracy of the cam timing by looking at two valves on a hyd cam is....... you’re assuming both lifters are going to be bled down the same amount.

If you do it based on only the centerline of the intake valve....... you’re not trying to compare it to another valve.
It’s just where the one valve is relative to the mark on the damper.

In theory, either method would answer the question about whether the cam was at least “close”...... or not.