"If I were to have 7.35 ratio, it's no wonder I can advance the ignition timing to the moon (not literally, but I can go more than I have now) and get no pinging."

BINGO! This shows me that you are worth teaching!

"How is the dynamic compression ratio different than normal CR, and how did you calculate that using the information I gave?"

Static compression ratio is the comparison of the volume of mixture that is drawn into the motor through the intake valve to fill all available spaces and crevices with the piston at bottom dead center compared to the volume of mixture that it is all compressed into with the piston at top dead center.

Dynamic compression ratio goes a step farther by factoring in the stroke of the motor, the length of the rod and the intake closing point of the cam. The intake closing point is the most important event in the total cycle of cam timing and determines whether you have a motor or you don't.

In the case of your motor, the intake valve is closing about 17 degrees too late to trap the proper amount of mixture to make any power. Although I couldn't find the actual intake closing point of your cam in any of the Lunati information (that's why I use Crane Cams, they give me the info on their website without having to call anybody), I figured that it is about 48 degrees after bottom dead center (ABDC). The cam I suggested for you has a closing point at 35 degrees ABDC, so it will trap more mixture in the cylinder instead of the piston pushing fresh mixture back up the intake tract with the intake valve still open. By advancing the cam another 4 degrees, you will be closing the intake valve at 31 degrees ABDC. That would make the DCR about 8.169:1 and you should be able to see a significant difference in the low rpm performance of your motor.

In order to properly spec a cam for a motor, you don't have to be an Einstein. You just need a few tools and enough intelligence to use them.

The first thing you ABSOLUTELY MUST know is the static compression ratio of the motor. There are online calculators you can use, but I want you to know how to do it yourself. This paper I wrote has had 936 hits since I posted it.....
http://www.streetmachinesoftablerock...opic.php?t=124

Continued on next post.....