Yep, had one of those in 1980. It was too small. So I went to the 292/509 cam. It was a bit small but I didn’t have adjustable rockers so I settled.
Then I went to roller cams.
Purple Shaft Cam Specs??
- Thread starter mopowers
- Start date
-
Yep, had one of those in 1980. It was too small. So I went to the 292/509 cam. It was a bit small but I didn’t have adjustable rockers so I settled.
Then I went to roller cams.
only 1 for the big or small block. 284d, 471 and 474 lift and 110 lc.
that's the thing... there's conflicting reports.
street, race, "old", "new"
there's no single clear cut consensus
I’ll look and see if I still have one from the 70s. I used the Street Hemi grind in most of the 340 builds. I bought 10 at one time. They were $37.50 for just the cam.
PRH
Well-Known Member
Wow!! What year was that?
My first cam purchase was in 1981.
It was a Crower Monarch 280H for a 440……. It was like $65 at a local speed shop in Sacramento, Ca.
PRH
Well-Known Member
M & M
1977. In 1983 i bought my first 284/484 can and lifters for $188.00
I've only ever seen ONE camshaft called a Hemi cam that was from Mopar. There were several aftermarket grinds. Mopar made one of each for the small block, big block and Hemi. Too bad they left the slant 6 out.
lilcuda
Well-Known Member
- Joined
- Apr 15, 2006
- Messages
- 1,140
- Reaction score
- 153
I put a 280/474 cam in my 340 back in the early 90s. I had a local can grinder measure it before I installed it. It came out to 238@.050”. I also had it parkerized since MP was too cheap to do it.
James Clews
Well-Known Member
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.
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.
What lift is it?
BSB67
Well-Known Member
The 280 .474 will measure 234 @ 0.050”.
If you have time take a measurement at 0.006” and 0.008”. You’ll be surprised at those numbers too.
mopowers
Well-Known Member
Thanks. It's all boxed up and on the shelf now. What are the .006/.008 numbers?
BSB67
Well-Known Member
290, and 280-ish, respectively
I have known Jim [ James, post #38 ] for more than 50 yrs. In the 70s, his brother went to the US & bought some cams. Some at least were from Racer Brown. He got me a custom grind from Racer for my 440, the 292/292 Direct Connection cam, but ground on 114 LSA. I suspect Jim is referring to a similar cam.
James Clews
Well-Known Member
Rusty you are probably correct as I meant to say 106 but as my memory is fading it may have been 108 but all I know is that last one was way more rowdy than the 114 cam I had many years earlier.
Bewy I ran you many times and my car was a surprise to many on how mild it ran but was very quick.
See I always remembered that 114 292 was with a 510 lift but I stand to be corrected!
I threw in the oval track cams because they were routinely ground on a more narrow LSA, plus, as many Mopar cams as were available, it could have been several grinds. I have the fading memory syndrome too. Kitty says it's sometimes selective.
In 1975 those purple cams were 29.95 and 39.95 with lifters and never had much luck with them.I would always go with the Cam Dynamics 15007 and 15010 for a hyd lobe made way more power but they were 69.00 no lifters.
Direct Connection was a great place to buy gear sets 99.00 when Schafer and Dana were 249.00 and Dist. were 39.00 and 49.00 with the chrome box and wiring when Mallory YL's were 49.00 and 59.00 ...
Direct Connection was a great place to buy gear sets 99.00 when Schafer and Dana were 249.00 and Dist. were 39.00 and 49.00 with the chrome box and wiring when Mallory YL's were 49.00 and 59.00 ...
-
Similar threads
- Locked
