[mike pratola]

Hi all, I bought a 350 crate motor from an individual who inherited it years ago and had no paperwork on it. It was still wrapped in a Summit bag, 4 bolt main roller cam block, GM 10088113 fast burn aluminum heads, Mahle 101V13 pistons, so it's got good bones. I'm planning on running a 4L60 and need to know what stall speed converter I will need, so I pulled the cam to see what the power characteristics would be. Well the cam doesn't have any manufacturer's info on it. The only characters etched on the cam are 506 CPC BC 16, with a pink paint stripe in front of the distributor gear. I've called Comp Cams, Camshaft Performance, Jegs and Summit, to no avail. I'm not aware of anyone close to me with a Cam Doctor or similar analyze (I'm in SE Pa) . I made an attempt to profile it but don't trust my set up or findings, I'll attempt it again now that I've got a better set up but was wondering if anyone might recognize these markings. Thanks - Mike

 

[Georgia69]

Honestly, in your shoes I would pick a cam that suits my needs and just replace the existing cam.

 

[Malibu ss 64]

Sounds like a zz4 engine? Zz4 cams can have a pink stripe But think those cams have 071 stamped in them.

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[68Chevele]

I think I have like 4 mystery cams on the shelf. Never understood why cam makers don't stamp their cams better.

 

[Lew540]

Depends what you want to do here you could ship it to a place that has a cam DR. The question is at what cost and do you want to get your own cam for your needs. You either Cam DR it or just buy a new cam you don't want to put it in only to find out its a cam that you don't want. You can estimate the lift easy but the duration which in some ways is more important you will just be guessing if you try to measure it yourself. I guess if its in the motor and you have all the tools you can do a cam wheel and degree test also.

 

[BillK]

Mike,
Do you have or can you borrow a degree wheel ?? It would probably take less than an hour to put the cam back in, stick the degre wheel on the crank and see exactly what it is.

 

[mike pratola]

Mike,
Do you have or can you borrow a degree wheel ?? It would probably take less than an hour to put the cam back in, stick the degre wheel on the crank and see exactly what it is.

I've got a degree wheel and a proper dial indicator but didn't have a good way to watch the degree wheel while turning the flex plate. I've since bought a tool to turn the crank that slips over the crank snout, can mount the degree wheel to and turn with a 1/2 breaker bar, that should make it much easier. I hesitated to pull the heads but feel it's probably worth the effort to accurately check compression ratio and TDC. I have a feeling this is a ZZ4 clone, as mentioned earlier. I don't mind buying another cam if this one doesn't suite what I have in mind but just want to be sure.