Ported GT40x bigger cam more compression pump gas help ?

[ByByC5]

Just a thought to keep in mind when trying to calculate compression and different cam combos.

Static compression is good for a relative mechanical starting
point, but the Dynamic compression is what will determine the streetable performance or being able to use pump gas.

The intake valve closing time (in degrees after bottom dead center) is where the Dynamic Compression is calculated from, and this ratio is critical. Seems alot of cams close the intake around 40*ABDC.

If you already have your long block built..before you buy a cam, Do a google search on Dynamic compression and figure out which cam will give you an exceptable DCR for the street. You should be able to find a DCR calculator from there.

HTH
Keith