What's Up With My New 296 .557 Mp Cam.....

[CL440]

JUST GOT DONE CHECKING MY ACTUAL LIFT AT THE CAM LOBE ON MY .557 SOLID MP CAM. HERE ARE MY FINDINGS:

LOBE CROSS SECTION: 1.189
LOBE TOP TO BOTTOM: 1.552
(YES I DID TAKE INTO CONSIDERATION THE LOBE TAPER)

1.552-1.189=.363
.363X1.5=.545(WHAT THE HELL HAPPENED TO MY .557 LIFT?)

THEN FIGURE IN THE .028 VALVE LASH:

.545-.028=.517 VALVE LIFT!!!

I NEVER WORRIED ABOUT THE .028 LASH BEFORE, I FIGURED MOPAR TOOK THIS INTO ACCOUNT WHEN THEY GROUND THE CAMS AND ADDED ENOUGH LIFT TO GET THE LIFT THEY ADVERTISED. GUESS NOT.

LOOKS LIKE I WILL HAVE TO USE A 1.6 ROCKER JUST TO GET CLOSE TO THE ADVERTISED .557 LIFT! AND THAT WILL ONLY GET ME TO .553 VALVE LIFT!

[Jims451]

You really need to measure the lift with a dial indicator while rotating the cam. When I measured a small 260/270 duration cam the way you described, the lift came out way too small also, so I put the cam in "v" blocks and measured with my dial indicator while rotating the cam and got the correct cam lobe lift numbers.

[CL440]

I WILL TRY THAT. THANK YOU

[CL440]

THANK'S!! TOOK YOUR ADVICE (AND MY DAD'S) AND CHECKED THE CAM IN THE BLOCK WITH A DIAL INDICATOR HERE ARE THE RESULT'S:
.370 LIFT AT THE LOBE!!

MUST HAVE BEEN INTO THE ACCEL. RAMP WHEN I USED THE MICROMETER.

.370X1.5=.555 LIFT(CLOSE ENOUGH!)

I PLAN TO USE THE CRANE 1.6 GOLD ROLLERS WITH THE CAM SO I SHOULD HAVE .564 VALVE LIFT AFTER SUBTRACTING THE .028 LASH.

THANK'S AGAIN!!