Purple Shaft Cam Specs??

James Clews said
I had a 292/509 purple shaft cam in my 340 back in about 1976.it idled great at about 650rpm with a nice lope and reved cleanly to seven five as this was in a manual with six pak carbys it would pull cleanly from any revs. fast forward to about 2005 and I bult my 410 and installed what I thought was the same cam and I hated it. It didn't smooth out until over two grand and was a pig to drive.
What was different? The early one was on a 114 lobe sep and the new one was on a 105 lobe sep.
thats when I learnt that the tighter lobe sep may make more power but is very rowdy especially in a manual car.
I now have a roller hyd cam with 238/242 @ 50 with a 112 lobe sep and this cam is really well behaved in my 5 speed manual and does low eleven sec passes and gets 23 mpg on a run with a 3.91 diff ratio .
Yes a tighter lobe sep would probably make more power but in a manual drivability is far more important.

I only know of 2 of those cams that Mopar actually offered. Both had the same specs except one had the 114 like your first one and the other was on a 108, not 105. Now, there MIGHT have been an oval track cam with the 105, I don't have the complete list, so I don't know. The 108 508 cam was .508/292 on a 108 and it had 248.5 degrees duration @ .050". It was rowdy. I've run a few. I liked them though, because I always ran pretty loose converters and deep gears like 4.30s.