i got a cam used off a member here and was wondering how i would check to make sure it is what i think it is. all i see on the back of the camshaft is "2307 4" and the 4 is kinda isolated by istelf. then in between the distributor gear and the first lobe it has "1578" on it and it has white paint over it. then more towards the front there is red paint right before the first lobe and it says "27" with a circle around it. idk what any of this means but im hoping someone can make shed some light on the issue. it is supposed to be a Comp Cams 503.

 

go to comp's website and you can look it up there

 

it has grind numbers but nothing that compares remotely with what i have on mine. the only thing im thinking is it has 230 in the one main number on the end and 230 is the exhaust duration number. otherwise i have no idea.

 

I have a Comp Cams 503 cam that I never installed in front of me.
It has the following grind numbers in the back:
LT1 3314S/3315S HR112.
These numbers identify the corresponding 224/230 lobes in their cam lobe master catalogue.

RG

 

Yeah my old XE cam had the lobe numbers ground right on it, same as my buddies.

 

hmmm, the only thing with those numbers tho is that on summits site and comp cams site, it says the grind number on the 503 is supposed to be this:LT1 XR276HR-12

whats the difference between the number comp and summit have listed and the one you guys say is on the cam?

 

The numbers listed on the back of the cam is usually the Lobe numbers while the number summit has is like the cam ID number or grind number i believe.

 

o gotcha. i read now in the comp master lobe guide thing. makes sense, but is the grind number that comp and summit have listed, actually ground into the cam itself or are only the lobe numbers like you guys have listed above?

 

Besides the information I listed before, there is also a serial number written down in the back of the cam. This serial number appears also in the spec card supplied with the cam.

RG

 

Sounds like a custom cam. Get a cam doctor for it and you'll be good to go.