Hello again. I've begun the assembly on my engine, and I need some cold hard facts on my camshaft. Story is, one of our local car club members have this cam in his 402 for less than a week. It was so rough that with the stock converter, the car would stall if idling in gear. On the top is stamped comp cams, and the only other thing is 270 Y, the Y is slightly lower than the 270. I cannot find any cam with a Y grind number on comp cams site. I phoned comp cams, and they sorta never heard of a cam with a Y grind number, and just assumed it was the 270 H. Problem is the 270 H is a mild idle that works with the stock converter, and from what everyone is saying, this cam rediculously rough. Could this have been on old cam, just laying on the shelf at the shop for a while and have gone by a different numbering system? The guy on the other end of the phone asked if it was stamped CC, mine is stamped "Comp Cams", with the two words horizontally offset. I just assumed what he was talking about and what I was, was the same thing. Any help would be greatly appreciated. Thanks

A 270 deg advertised duration cam (not 270 deg @.05 dur cam) is very mild for a 402 and you should be able to idle decent in gear with auto trans with proper dialing in of carb,intial timing at approx 16-18 deg btdc, total timing @ 36-38 deg btdc,along with limiting vac adv to approx 10-12 deg advance max.

Now if that 270 dur is really @ .05 then thats a huge cam for a street 402 but you need to know what cam you have and specs to get proper advice from us before we can assist you in dialing the motor in to idle/run better.

Scott

The problem is, that I cannot find any specs on the cam what so ever. The box which the cam was in, had the specs for the mild cam which replaced this one. I have been trying to use the what ever number I can find to find out exactly what this thing is. My car is a 4-speed, so the bigger the better! Thanks

Not idling in gear could be a number of things. Valves adjusted too tight, cam in far too advanced, incorrect timing, vacuum leak, carb adjusted wrong, carb needle& seat are dirty - to name a few.

The cam was probably retarded about 18*.......
If the crank gear has the keyway lined up with the dot on the cam gear, the cam is retarded at least 2 teeth. The dot on the cam gear is supposed to be lined up with a mark on a tooth a couple of teeth counter-clockwise from the keyway.
A severely-retarded cam exhibits the characteristics that you have. The cam probably is the CC 270H, just retarded.....

UDHarold

If the cam in question was made by the Comp Cams company, then I would think that Comp cams can asnwer your question. They might very well have grinds that are NOT listed on their website, as well as ones that they do NOT produce anymore, but still can tell you the specs on.

BTW, you installed a used cam in your engine? If that's the case, then I hope it was broken in right. This is a flat tappet cam you're talking about, right?

I think as well, that it's a 270H. That is what the the comp cam employee said anyway. I havn't installed it yet, I was trying to find the information on the cam that was already in before the rebuild started. The engine has little wear since it was just rebuilt, but by fault of the shipping company I had to rebuild with some machine work. This cam is stamped C D with three numbers, which I can't remember off the top of my head. One of these numbers matched up with a crane cam part number with advertized duration of 282* and lift of 533. If I am not mistaken, this doens't seem all that more radical than the comp 270 H (270 and 510). However accodring to the crane site the cam merrits a 2500+ stall converter and 9.5-11.0 compression ratio. Can anyone confirm what company " C D " is, incase just by coincidence crane's part number matched one of the stampings?

Yes, they are both flat tappet cams. As this is my first build, a mentor of sorts from the club is helping me with the entire ordeal. He was mentioning that there is a farily expensive head job done, however for some reason the only thing left unchanged were the rockers. I am looking for a cam that would give a nice 'lumpy' idle. Would this 'C D' cam, if indeed it is crane's, provide it? I doubt comp cam's would, but in any case, is there any other suggestions? The car is a 4-speed, 3.55, and will have approx. 11.25:1.
Thanks again for your help.

Phil, I believe there is a cam company called "Cam Dynamics", and I know for a fact there's one in Florida called Cam Technique. I hope that helps you. I'd call them if I were you. I had a Cam technique brand cam in my 73 Vette a few years ago, and it was great!

Cam Dynamics is now a brand name inside Crane Cams, as they acquired Cam Dynamics in the early 1980s. It is just like UltraDyne is now a brand name within Bullet Cams, as Bullet acquired UltraDyne's equipment, etc.
The initials 'CC' almost always mean 'Competition Cams'. I think the cam is a garden variety 270H, and mis-installed in the original car.

UDHarold

The initials 'CC' almost always mean 'Competition Cams'. I think the cam is a garden variety 270H, and mis-installed in the original car.

UDHaroldBut I think he said that the initials on his cam are "CD".

The opening post says the cam is stamped "Comp Cams".....

UDHarold

Can anyone confirm what company " C D " is, incase just by coincidence crane's part number matched one of the stampings? ...........

Would this 'C D' cam, if indeed it is crane's, provide it? I doubt comp cam's would, but in any case, is there any other suggestions?
Thanks again for your help. The above quote is taken from post #7. :confused:

why in the world would you put an engine together with an unknown cam(used) that had idle problems-cams are to cheap(non roller) to even have those headaches
as noted, it could be a cam on the mild side, not installed correct, if thats the case, mat not have been broken in correctly also-save yourself some headaches, throw it away-your gonna have to buy new lifters anyway, so your 1/2 way there

I'm begining to think the same way, I guess its gonna have to be a new cam. To fix the confusion, I started by asking about the comp cam I had. Then last night, I took the original cam and was trying to find out who made it, and decided to ask the question in this thread. Thanks again for all your help.

I can see the confusion right away. By original cam I mean the cam that was already in the engine before I took it apart.

BillyGman,

Sorry, I missed that post.....

UDHarold

BillyGman,

Sorry, I missed that post.....

UDHaroldThat's okay. No foul. I kinda agree that there's no reason for him to mess with a used cam anyway. Because as it's been stated, flat tappet cams aren't very expensive. So why not just get a cam that's new, and it will also be one that atleast he knows exactly what it is, and what the specs of it are w/out any guessing.