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Old 10-06-2010, 03:27 PM
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Trying to identify an old fireball cam

hey i've got a 350 chevy and i am trying to find some info on the cam. almost positive it is a fireball. does anyone have an old catalogue that could tell me anything?
i've got some numbers:
3927141 and below that is g267m.
not sure which one will help you.
the engine is a 1978.
thanks alot!

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Old 10-06-2010, 03:34 PM
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An aftermarket cam is usually stamped with the grind number on the rear face of the rear journal. If you plan to re-use the cam, only use it in the block it has been runnin' in with the same lifters in the same lifter bore locations. Using it in another block may not work so well, although you may be able to use new lifters on the old cam in another block and slide by. If you are putting it back in the same block and you didn't keep the lifters arranged in order on disassembly, use new lifters and hope for the best.

With the cost of a new flat tappet cam being what it is today, I wouldn't take the chance of using a used cam. Because of the extreme pressure lubricants being removed from engine oils and because of all the precautions you have to take with flat tappet cams, it makes a lot more sense to switch to a roller arrangement. I know it looks expensive from the git-go, but the lack of having to tear the motor down to clean out all the shrapnel and buying another cam and lifters after this one frags might change your mind.

At the least, here's a list of things to consider with a flat tappet cam....
http://www.crankshaftcoalition.com/w...ips_and_tricks

Last edited by techinspector1; 10-06-2010 at 03:42 PM.
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Old 10-06-2010, 04:11 PM
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Post the cam lobe lift of one intake and one exhaust lobe, using a micrometer or dial caliper to measure the major and minor diameters of the lobes.

M diameter -m diameter = lobe lift. Lobe lift x 1.5 = valve lift

The number indicates a GM Z/28 first design off road cam.
Mechanical lifters 257-269 112 .494"-.512" .024-.026"
4000-7000+ rpm.

The old Crane fireball cams had "FireBall" and or the crane grind number stamped on the end. EG: FireBall 300H

Last edited by F-BIRD'88; 10-06-2010 at 04:41 PM.
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Old 10-06-2010, 07:10 PM
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can u give me a quick definition of major and minor diameters. if i put the dial caliper throught the lifter bore and turn the cam am i getting a major or minor? thanks
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Old 10-06-2010, 08:08 PM
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oh hold do you mean just measure the full height of the shaft and lobe and subtract if from the height of the lobe? i think i was making it alot more complicated than it needs to be. i was trying to use a dial indicator.

Last edited by 70' c10; 10-06-2010 at 08:14 PM.
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Old 10-06-2010, 09:54 PM
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Get your 5 year old to show you.
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Old 10-06-2010, 09:58 PM
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Get your 5th grader to show you.

if you don't have a 5th grader, borrow the neighbors'
Let the 5th grader read the cam degreeing directions
on the Lunati Cams site tech section and they will do it for you.

Last edited by F-BIRD'88; 10-06-2010 at 10:19 PM.
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Old 10-07-2010, 07:39 PM
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my little friend says thanks for the help.
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