Cams choice, Low CR vs VE%

Did you perhaps check the Dcr using the Ica @.050 numbers? That will inflate the number impossibly high.
You have to use the advertised numbers ........ and your intake valve is NOT closed at even that number. So your calculated Dcr is always higher than your real-world Dcr.
Your Dcr can NEVER be higher than your Scr, and is usually near 1.5 or more points lower, with a typical street cam.
At 9.6 Scr, I would be looking for a Dcr near or less than 8.1, so if my calculator spit out a number too far from that, I would call bs and start over.


here is an LA318+.020 example;
Static compression ratio of 9.6:1.
Ica of 59*/600 ft elevation
Effective stroke is 2.68 inches.
Your dynamic compression ratio is....................... 7.95:1 .
Your dynamic cranking pressure is 159.01 PSI.
V/P (Volume to Pressure Index) is 124

I grossed up your 216*@.050 cam to 262 advertised. and installed it at 108 to come up with that Ica of 59*; I have no idea if that is accurate; it's just an example.
Also I guessed at 600ft elevation.

Notice that 7.95 is ~98% of my estimated 8.1.

Wallace Racing: Dynamic Compression Ratio Calculator

If you had used the .050 numbers, you might have got;
Static compression ratio of 9.6:1.
Ica of 36* @ sealevel
Effective stroke is 3.08 inches.
Your dynamic compression ratio is ....................... 8.99:1 .
Your dynamic cranking pressure is 190.34 PSI.
V/P (Volume to Pressure Index) is 171
And that would likely be impossible to drive if true. Thankfully it is not correct.