Camshafts and Compression
Thanks for the input. My comp tester is good quality, I have borrowed another off a mechanic friend. 210-220psi.
IMO, if you truly have that much pressure, then either;
>your Ica is not where it's supposed to be, aka the lifters have bled down, making your cam appear smaller, or the cam is outta time,
>or the Scr is not 10.7,
>or the cam is just not what you think it is.
Personally,
If I estimated the advertised close to correct, I would totally love that cam. The intake duration is only a couple more that I have, but the overlap is around 13% greater. I would run that straight up in my 367 and still have lots of pressure.
This is incredibly easy to solve.
Just put #1 piston on the beginning of the Compression stroke, then inject about 20 psi air-pressure into the chamber. Then Slowly, with a big bar rotate the crank CW until the intake just closes, and compression starts. When you find this point, Mark the Balancer next to the TDC index on the Timing Tab. Stop the test, release the air. Now go figure out where your mark is relative to BDC.
Using your numbers, which I grossed up from 050 to .008, as best as I could, this should occur near 64 ABDC. aka 116* BTDC.
If you have a calibrated Balancer, or a timing tape, this is so easy.
Caution;
At 20 psi, on a 4.04 bore, if you try to close that intake valve, the top of the piston will generate 250 pounds of force. You will need a long bar to fight that. If it slips, it can do serious damage to various body parts and/or your rad. You have been warned.
Most likely the bar will start bouncing, so be prepared.
As previously stated, if your lifter bleeds down, it will give you an erroneous reading.