[Holeshot71]

Originally Posted by Jay S

That Edelbrock cam is going to be pretty much the same cam with identical performance as an Melling, Summit, Comp, Lunati and probably a couple others. I don’t know if CMC grinds it, it could be ground in house at Comp on a standard EPC core. You can look and see what you have if you want, find where the cam has CWC cast into the core, roll it over to the other side and see if it says “EP”. If it says EP it was either ground at comp or at EPC instead of CMC. If it says nothing there, it is likely a RA4 cam from CMC, and is ground on the same machine as the Melling and Summit cams.


Often all flat tappets are grouped together for failures, they really shouldn’t be. Mechanical flat tappets don’t have the problems that HFT cams have. They are ground on better cores, with better material. At least they have been, I don’t know what the future looks like. I think when the lash is taken up it promotes lifter spinning also. They are just plain more rugged(unless you go nuts with an aggressive profile).

Here is a photo of a Bullet SFT and a current melling SPC-8 I checked in my friend shop (2018 SPC-8) which is the same as the current CMC cams, .477” was the nose width of the lobe on the SPC-8. Which isn’t bad, I have seen some Pontiac HFT cams that had .455” width lobes. The Bullet UD grind has .564” width over the nose, and the base circle is over .625”. Mild SFT’s are pretty rugged, especially with face oiling.

Out of curiosity I checked the cam to see what it has cast. Underneath the Cosmoline it has CWC/CMC on each side and also B4/180. On the other end by the gear it has D2 and USA. Also the lobes are .589” wide.

[Jay S]

Originally Posted by Holeshot71

Out of curiosity I checked the cam to see what it has cast. Underneath the Cosmoline it has CWC/CMC on each side and also B4/180. On the other end by the gear it has D2 and USA. Also the lobes are .589” wide.

That looks like an older Eddy cam ground by CMC. One of those letter and numbers cast into is probably the lobe class (D2). That should be what the RA4 cam is suppose to look like.

With the Post Covid era sketchy metallurgy and machining, the narrower lobes are not helping. About have to have the cam nitrided these day just to get past the break in.