[82 GT]

Originally posted by Rev
There is some leeway in the way manufactuors measure "advertized duration". I think the best way is to compare duration at .050" lift. Sometimes, advertized duration is manipulated to give higher numbers because that seems to be what some people want. What some manufacturers do is to start the ramp earlier and end it later, but at miniscule amounts to artificially raise the "duration".

The 224/234 @ .050" numbers tell me this is exactly what Crane did. As a comparison, my 268 HE from Comp Cams is 218/218 @ .050". So I'll bet your still OK if a max street cam is what you're after. It might compare to another cam advertized as 280/290 or something like that.

Rev

Rev , made an interesting statement there. How can two cams with similiar lifts @.050 have very different advertised durations?
Do you mean it's possible that my duration isn't really 298*/304*
only because Crower Cams and other cam companys are trying to sell people what we think we want in terms of duration?
In other words, are two cams with the same duration @.050, the same lifts and the same same lobe centers actually the same cams regardless of "advertised" durations?
I guess it's best to pick a cam based on specs @.050 and ignore advertised durations and lifts.
If that's true then that's how people get confused when it comes time to pick a cam because "adertised" specs and .050 specs are like the Metric system and English system.
Mosy people relate better to "advertised" specs(English system) better than the .050 specs(Metric system)
Would that be an acurate analogy?

This is an interesting class we are having here!