Re: old Purple shaft identification
[Re: Moparnut426]
#2701072
09/26/19 10:45 AM
09/26/19 10:45 AM
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Joined: Jan 2003
Posts: 17,841 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,841
S.E. Michigan
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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
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Re: old Purple shaft identification
[Re: Moparnut426]
#2701095
09/26/19 11:46 AM
09/26/19 11:46 AM
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Joined: Jan 2003
Posts: 14,493 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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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
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Re: old Purple shaft identification
[Re: fast68plymouth]
#2701099
09/26/19 11:50 AM
09/26/19 11:50 AM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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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. 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
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Re: old Purple shaft identification
[Re: an8sec70cuda]
#2701108
09/26/19 12:11 PM
09/26/19 12:11 PM
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Joined: Feb 2005
Posts: 20,164 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,164
PA.
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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
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Re: old Purple shaft identification
[Re: pittsburghracer]
#2701111
09/26/19 12:12 PM
09/26/19 12:12 PM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,357
Marion, South Carolina [><]
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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
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