360 timing

RustyRatRod said
Dynamic compression in the 9s AIN'T pump gas friendly. Also, camshafts do not "bleed off" cylinder pressure. That's not how it works. It all depends on when the intake valve closes. The later the intake valve closes, the later in the compression stroke the cylinder starts to build compression. To say the camshaft "bleeds off" pressure, insinuates that it is done at the end of the compression stroke, which is not true.

Perhaps I stated what I was trying to convey incorrectly. Let me explain my statement, and I am by no meens trying to invite an argument on engineering, cam theory and all other things mechanical. I am just explaining what worked for me
I built a lowly H-D sportster engine. Originally an 883cc . I converted it to 1200ish . I replaced the 3" cylinders and pistons for 3.560's . Now I didn't try to cram all that extra volume into the same tiny combustion chamber. I used heads with higher cc combustion chambers. It was still too much compression for the factory cams. I installed a set with greater overlap which "bleed off" some of the static compression
Allowing me to step down from 105 to much more affordable pump premium 92 without retarding timing and without melting plugs and scoring cylinders. Keep in mind this is an air cooled engine that ran mufflers and sat in traffic quite often. I'm not totally "ignorant" to theory and application. And more often than not I do agree with you.
Perhaps 9.08 :1 is a bit extreme. So..... what is factory compression for 5.9 magnum engine out of the box truck engine?.
I await the ridicule and name calling..... Rant off.