502 rebuild questions ,,,, AGAIN !!!!!
02-21-2003, 08:20 AM
#21
Registered
I like the idea of the slower ramp speeds as Dennis Moore has mentioned. Slower ramp speeds equates into a longer living engine/valve train. It's just much easier on parts. I have the Crower hyd rollers, but I once had Ultradyne cams which usually have VERY aggressive ramps speeds. Both the Ultradyne and Crower have the same duration @ .050" numbers 236*/244*. However, the advertised duration numbers are different between these two cams though.
Ultradyne
(advertised duration) 288*/296*
Crower
(advertised duration) 300*/307*
The Crane 139741 hyd roller is very close 236*/242* as Mcollinstn has posted, but I don't know what the advertised numbers are on the Crane---I'm not real sure on this, but I heard they're not too aggressive.
All in all, I would rather sacrifice some HP and Torque for a little more reliability and I can see why GM designs their cams profiles this way---not a bad idea in my opinion.
Ultradyne
(advertised duration) 288*/296*
Crower
(advertised duration) 300*/307*
The Crane 139741 hyd roller is very close 236*/242* as Mcollinstn has posted, but I don't know what the advertised numbers are on the Crane---I'm not real sure on this, but I heard they're not too aggressive.
All in all, I would rather sacrifice some HP and Torque for a little more reliability and I can see why GM designs their cams profiles this way---not a bad idea in my opinion.
