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old Purple shaft identification #2701068
09/26/19 10:31 AM
09/26/19 10:31 AM
Joined: Mar 2007
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Finally a HUSKER again
Moparnut426 Offline OP
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Moparnut426  Offline OP
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Finally a HUSKER again
Im going through Dads old 440 from his charger, Im trying to identify the cam, ZERO markings on it, but the entire shaft is purple, and there is a single yellowish/white stripe on the butt end of it.

I dont know how to measure it to spec it out, I cant remember from college how to do so, that was like 20 years ago LOL


any info is appreciated...

Re: old Purple shaft identification [Re: Moparnut426] #2701072
09/26/19 10:45 AM
09/26/19 10:45 AM
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Posts: 17,801
S.E. Michigan
ZIPPY Offline
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The very oldest ones like yours really need to be measured.

The paint dot/stripe markings on them, although documented by Mopar many years ago (never
published publicly) have been proven wrong time and time again. By the time I came across the 6th or 7th
one that had specs that didn't match the paint codes, that was enough for me.

Later ones have engraved markings and are easier.

The easiest way to do it is put it back in the motor, with one lifter set up a degree wheel and an indicator,
and measure lift and duration.


Rich H.

Esse Quam Videri




Re: old Purple shaft identification [Re: ZIPPY] #2701078
09/26/19 11:04 AM
09/26/19 11:04 AM
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Finally a HUSKER again
Moparnut426 Offline OP
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Excellent info

Thank you

Re: old Purple shaft identification [Re: Moparnut426] #2701095
09/26/19 11:46 AM
09/26/19 11:46 AM
Joined: Jan 2003
Posts: 14,479
So. Burlington, Vt.
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fast68plymouth Offline
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Usually just knowing the lift is all you need to figure out what you have, since they all have different lifts.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: old Purple shaft identification [Re: fast68plymouth] #2701099
09/26/19 11:50 AM
09/26/19 11:50 AM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
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Originally Posted by fast68plymouth
Usually just knowing the lift is all you need to figure out what you have, since they all have different lifts.

iagree Just throw a dial caliper on the lobe...measure the base circle and then the top of the lobe. Subtract the base from the lobe, then multiply by 1.5 = lift.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: old Purple shaft identification [Re: an8sec70cuda] #2701108
09/26/19 12:11 PM
09/26/19 12:11 PM
Joined: Feb 2005
Posts: 20,116
PA.
pittsburghracer Online work
"Little"John
pittsburghracer  Online Work
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PA.
How can you distinguish between a hydraulic cam and a solid cam. I have a couple purple shaft small block cams I plotted out in a old block that I would like to sell then moved on to another project I never finished


1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time




Re: old Purple shaft identification [Re: pittsburghracer] #2701111
09/26/19 12:12 PM
09/26/19 12:12 PM
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
an8sec70cuda Offline
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Like Dwayne said...if you could figure the lift on it, it'd be pretty easy to determine which cam it was.
As for looking at a cam and telling if it was a solid or hydraulic...I dunno. I'm sure some may know a way, but I don't.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: old Purple shaft identification [Re: an8sec70cuda] #2701266
09/26/19 10:40 PM
09/26/19 10:40 PM
Joined: Sep 2017
Posts: 335
Red Deer, Alberta
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Greenwood Offline
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Red Deer, Alberta
Once you determine the lift, you'll know whether its a solid or juice cam. Measure across the nose of the lobe, then the base circle. Multiply the difference by 1.5. Every purple shaft grind has a different lift, so just match the numbers and you'll be golden.







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