Just received my replacement cam from Summit/ Comp Cams & noticied something kinda odd. First observation was that the grind # serial numbers were engraved by hand on the end of the cam,whereas the one that failed was done by a machine. the second thing I noticed was on the cam card just below the grind # it says

Special Instruction 1:
Special Instruction 2:

Do you suppose they cut replacement cams out of a different core or something?? What do you guys think? :confused:

Hand processed, ground like a custom cam except with a off-the-shelf pattern, probably Rockwell tested.

It's their way of making sure you get a part that's known to meet specs. If this one wipes you (and they) can be fairly sure it isn't the cam's fault.

Thats pretty much what I was thinking --or actually hoping... ;)

Don't mean to be a snit, but cam is one area I wouldn't cheap out in. It's the brains of the motor. You put some generic low-buck grind in there, you acheive generic performance. You wnat an upside surprise, like I did ( 118mph was a surprise) you get the correct grind.

427,Are you saying the comp xe grinds are no good,or do not make good power?? & what would you suggest with the following combo?

Combo:

· 396 Bored .040 over
· 9.7 : 1 Compression
· 702 Heads with 3 angle grind.
· Speed Pro Forged Pistons (part # L-224ONF)
· Eagle SIR I Beam Rods
· Comp Cams XE274H-10 - .552 .555 / 230 236
· Comp K-kit (matching valve springs ect.)
· Harland Sharp Roller Rockers (1.7 Ratio)
· Holley 700 Double Pumper
· GM HEI Distributor
· MSD 6AL Ignition Box
· Hooker Super Comp. Headers (with jet coating)

As for the XE cams... read this post and LOOK at the graphs yourself

http://www.chevelles.com/cgi-bin/forum/ultimatebb.cgi?ubb=get_topic;f=4;t=019621

There is definatly something wrong with the cams other than the 250 and maybe the 262.

Though I bet cyl size/compression has some to do with the differences.


On a side note, my comp cam was not engraved at all. Bought from summit, came in a comp box it looks like they used a fine tip paint pen to label the grind on it.