Re: Did Chevy consider Packard V8 BB Design?

Posted by Craig Hendrickson On 2008/10/12 12:25:32

Jack,

I think the unexpected difference is due to the way Dyno2K emulates camshaft ramp profiles when given 0.050 duration numbers. For instance, if I put the Packard 6480561 cam profile in the 348, it produces almost the same VE numbers (69.4@2000 and 77.1@4000) for the 348 as the 352.

As for the Isky CamDoctor, the duration was measured at what lift?

I've found that Dyno2K does OK with stock ramp profiles and hydraulic tappet, but requires solid flat tappet to get close on the aftermarket agressive ramp profiles.

Craig