Crane cam ??

I have a hemi with a crane cam. Can somebody explain these numbers on this cam?
R296/500 16x-bb4750 98-3-02 on end camshaft
296 lift?
500 duration?
Centerline????
4-7 swap??
Install what degree??

Thanks randy

 

296 is duration at .050" lift.
500 is .500" lift at the lobe. Multiply by rocker ratio to get max valve lift.
16x is 116 degree centerline.
Not sure but BB4750 may be .475" base circle of cam.
98-3-02 ? Maybe manufacture date.
Never understood the need for 4-7 swap on a Hemi, but rotate the engine by hand and watch intake valve sequence if unsure.

 

BB is for the 2.125" diameter journals. 47.5 denotes the lifter bank angles are inclined 47.5 degrees from vertical. A number of earlier aluminum blocks have lifter bores that were supposed to be inclined at 48 degrees, but were off a bit, causing cam timing differences from left side to right side. It's always advised to degree in cylinders 1 & 6 to make certain that the block is what it's supposed to be. Regards, Chase

 

thanks guys that was the info i needed!!!
randy

 

Well you couldn't get much better info than from Chase Knight......he is/was the man at Crane for several decades.

 

...that'd explain why sometimes when timing in #1 & #6 they are at times off from eachother 3 or 4 degrees?

 

did u want to sell that cam shaft

 

What do you do if they are off from each other ?