Mopar Cam specs

[john h]

how do we know if the max lift on the Mopar cam is listed as @.050" timing or seat to seat timing?  it seems to make a really big difference in Torque and Hp curves on computer dyno programs.

John

[Strawdawg]

Normally both the advertised duration and the lift at .050" is shown on the cam card and in the cam description

[Chryco Psycho]

lift is lift from seat to full open  max lift doesn't vary
Duration varies a lot , advertised duration is 8* , .050 is more accurate & will make a big difference in fast ramp cams as you can get more duration between seat & .050 lift

[john h]

I'm putting my exact combo in the computer to see how close the numbers match to the dyno numbers for Mopar performance on a 360 crate motor.  I want to see what difference good or bad a single plane intake makes over a dual plane, and I can't match the numbers unless I know what value to use.  Seat to seat timing or @.050" timing.  the cam I have is listed as 274/264 .433"/.430"  using this cam and the 2 different ways of timing yields an increase of 30+ hp and 70+ ft/# torque for a seat to seat measurement.  neither are that close as to what Mopar claims on their Dyno but the seat to seat is closest.

Of course I need to figure out my spark issue before messing with anything else.  Just playing around with combos right now.

John

[Chryco Psycho]

using a Lunati cam you should be around .480 lift with similar duration @ 50