508 or 509 Purple Shaft cam

[Bad Sport]

I know I'm a little late to this but I spent 30 years working at Mopar dealerships, even running a Mopar speed shop out of one. Anyway from Mopar there was a mechanical camshaft designed for oval track that was a .509 lift. The specs that momoparnut described are correct. Part # was P4529969. However it was not very common.

You say the .509 isn't common. I'm not sure what the OP has, but mine is in fact the .509 (oval track) I have it brand new in the box w/solid lifters.

I have no idea how it well it would work in a smallblock.

 

[crackedback]

for some people .001 can make the difference.......lol

Difference between a **** career and being just a dumb dick... LOL

Please get over the .001 difference people call these cams.

I find the 114 LSA cam they made for these to be a complete turd.

Even at 10.5 compression, I wouldn't be afraid to install a 108LSA .508-.509 cam at 100-104 ICL... if you want some more low end grunt. Just make sure you have Valve to Piston clearance. Ignition timing will make a HUGE difference in how the cam reacts/runs.

 

[K.O. SWINGER]

The old 508 hyd cam was ground in two profiles p4529961 on 108 c-line and 76 deg.of over lap and the p4529962 on A 108 c-line and overlap of 80

 

[RustyRatRod]

I think the 509 solid would lend itself well in a small block. Remember, comparing hydraulics to solids, the solid will act about 10* smaller. So, you can imagine that cam as a 270 @ .050 on a 106 hydraulic if that gives you some perspective. It'll probably be badass in a small block.

 

[skrews]

I've profiled a few MP cams. None of them were what the cam card says they are. My ol' 284* adv / 241*@.050 / .484 lift PurpleShaft actually measures 290* adv / [email protected] / .480 lift. There are much better cams out there these days. If you just gotta have the "509 cam" get the Comp Cams version.

 

[longarm]

Don't know if this will be of any help to you as
I only have the top part of the card, but here goes:

P4120233 - A-Engine

Hydraulic Lift .508
Duration: 292
Overlap: 76
Centerline: 108

That's all I have left of the card,
hope it helps.

 

[gtsdude]

This post is a bit old, but I ran the solid 509/280 oval track cam in my 68 340 GTS, stock replacement pistons, 273 rockers, with X heads bone stock, headers, air gap, 750 holley DP, 3800 stall 727, 410 rea. ran best of 12.80 @ 105 in 1/4. Had it installed at 102. Nice radical idle and would idle down to 750rpm.

 

[71duster340x]

I've been trying to find the specs on the Mopar Performance Purple Shaft Cam for a smallblock. I found specs on a 508 cam but I thought they made a 509 for the smallblock and I can't find anything out there on it. Can anyone help me out here?
Thanks,
Frank

its a 508 on a 108 lobe sep.... i just bought one a buddy had sittin on a shelf since he bought it new from DC back in 1980... i have the original cam specs i'll post a pic of it in a day or so.....:burnout:

 

[MY340]

The book has a misprint. My God, what difference does it make? You're worrying about a .001" on an inch difference, do you realize that? ONE THOUSANDTH of an inch. You've already been told by more than one reputable person that the .509 was the big block grind and the .508 was the small block. It's a great cam but it's REALLY big for a hydraulic. You need at least 10.5:1 compression for it to run properly and give the power it was designed to give. It has 248.5* of duration @ .050" lift ground on a 108 LSA so don't expect a vacuum signal worth snot and expect a VERY rough idle. It will need a 3000-3500 converter and at the VERY least 3.91 gears and prefferably 4.10 or 4.30. It is a race bred hydraulic cam and runs that way, but it's a damn goodun.

I'd say it's a very rough & mean sounding idle. Ran the MP508 in my 340-4psd-4.10 SpaceDuster.

 

[abodyjoe]

here is how the 508 sounded in my dart..

[ame="https://www.youtube.com/watch?v=f7f9x4FKO6I"]dart exhaust - YouTube[/ame]

 

[Aussie Charger]

A guy I know just last night pulled out a brand new 280/280 .509"/.509" mechanical purple shaft with matching lifters and springs that have all been sitting in their boxes for years. He wants to sell it. It's a pretty rare cam - first one I've seen - and no longer listed, but they're out there!