Need help Id'ing a cam

[70chall440]

I have this Purple Cam for my 426 Hemi but the box is not correct for it. I have measured it several times but am not finding anything matching. This is supposed to be a hydraulic cam but I am not sure, I am wondering if anyone out there has any idea.

The nose to heel measurement is 1.525 (intake) / 1/522 (exhaust) and the base circle is 1.160 (I used a digital caliper), the rocker ratio is said to be 1.5 to 1.56; therefore I am coming up with .569 / .564

Iv'e read through many forums asking essentially the same question and obviously Mopar doesn't number their cams. Any help would be appreciated.

 

[Lefty71]

No way to mock it up in a motor and just check it with the degree wheel?

 

[70chall440]

Well I dont have a degree wheel so there is that... That said, I probably need one. Like I said, this is supposed to be a hyd cam, but I cannot figure out if it is or isn't. That is why I was hoping to get close enough to the lift to ID it but no joy thus far.

 

[Lefty71]

It's really hard to measure the way you are to come up with anything. And it's also really hard to tell, just by looking at it. However, I can see what you mean from the pic, it does look like a really flat ramp, bump right up to full lift, just like a mechanical cam would. You would expect to see a more gentle rounded ramp up on a hydraulic. Sounds like your best bet is find someone nearby with a dial indicator and a cam wheel, and then you'll know every detail in a hurry. Good luck, lefty71

 

[70chall440]

Thanks, I've thought about getting a degree wheel for some time, perhaps this is a good excuse to do so.

 

[70chall440]

Well I have ordered a degree wheel so at least I will have that. While I am waiting I decided to measure the cam with a digital dial indicator, I made a cam stand and got everything aligned and positioned, I did several intake and exhaust lobes to make sure of my readings. I am getting .364 on the intake and .359 on the exhaust; well Mopar seems to list there cams with rocker ratio factored in, so using 1.5, this then comes to .546 and .538 respectively. I have an old Mopar Performance catalog which has a list of cams for the 426, but nothing that matches or is really even close. I am thinking (optimistically) that this cam is P4349257 which is 524/507 lift hydraulic cam but am probably wrong, I arrived at this because there isn't more lift than this and the next cam is 572/557 mechanical but as I say I might be using some wishful thinking here. I will install the cam into the engine soon and measure the lift there I suppose.

 

[70chall440]

So, I ordered a roller tip for my dial indicator and it arrived today, I remeasured the lobes and came up with some slightly different numbers which now have me thinking this is a mechanical cam (P4529344) which is .572/.557. I will mock it up in the engine and see what that says.

 

[70chall440]

After some reading and research I am now very certain it is a P4529344, now to determine if this is a good cam for what I am doing.

 

[Lefty71]

now to determine if this is a good cam for what I am doing.

What are you doing?

 

[70chall440]

Building a street motor, not intending on doing any racing with it whatsoever. This engine will be in my 70 RR which has a tilt front end and really be more of a hotrod, conversation piece. I will be running EFI on it to be sure.

 

[70chall440]

I should note that I am using stock heads, will be running headers, the intake will be a MP single 4BBL.

 

[Lefty71]

Definitely at the high end, size wise of what you would want for a street motor, i'd bet.

 

[70chall440]

Yeah I am kind of thinking that as well, however I am not sure how much. I don't care if it is rowdy/lumpy all that much so long as the engine will have some street manners or better said is reliable; I don't want an engine that is miserable to live with. I don't have all of the specs on the cam yet as it didn't come with a cam card, but I will be degreeing it soon. At first I was a little concerned with it being a solid lifter cam, but again this is not going to be a DD and given the tilt front end, getting to the valve covers isn't an issue, so I am willing to live with that.

 

[70chall440]

I was hoping some Hemi guys would jump in here with some comments/advice.