Topic: Crane AU RPM and U RPM cam specs

[Turbogrimace]

I have a couple cams thati can't find info on.

One is marked Crane AU RPM. Under the washer it's marked G3982 J2344

The other is Crane U RPM with H1061 underthe washer. Both look to be stamped over other info.

I attached a few pictures.  I'd like to find the specs on them. This forum had some cards for other Crane cams, but I haven't run across any other info for Crane cams made for cb750s.

Any help is greatly appreciated. I tried measuring the lift, but got numbers lower than stock with my calipers. The lobe might be so wide I can't get a good measurement of the base circle.

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[corky]

Hi there,
I emailed my Crane cam card expert (who works at Crane cam) and he didn't have anything in the database with those codes. I'm thinking that is truly a one off cam grind.

Sorry I didn't have some better information!
Thanks,
Daniel

[scottly]

Hey Daniel, would your expert know the specs of a Crane Fireball cam for a big-block Mopar? I seem to remember it had an advertised duration of 29x degrees, but nothing else like lift or the actual timing; I don't think it even came with a card...

Sorry about the thread-jack, Grimace..

[corky]

Hey Scott,

Here are the specs for the only Fireball cam they made for a big block mopar with a single bolt cam.  He said if it is a 3 bolt cam he will need some numbers off of the cam.  It looks like it matches your guess on the advertised duration!

Thanks,
Daniel

[Turbogrimace]

Corky. Theres two of them. Labeled slightly differently. Perhaps they're custom regrinds from a larger off the shelf cam?

[scottly]

Thanks to you and your friend Daniel! That is the cam I had back in the early '70s in a 413, mounted mid-engine in a VW bus. The lift sure seems low, but I guess the thought back then was to keep the lift low to reduce the stress on the valve-train and make up for it by increasing the duration?