[Coloradocobra]

Hi Jim,

The cam is 224 and 232 degrees @ 0.050. This seems fairly typical for a hydraulic flat tappet cam. This may be good reason to go with a solid lifter cam as the duration at 0.050 is wider, as you mentioned in your post. Although I might improve throttle response some with a 600 or 650, I don't think this is limiting my higher RPM performance. The mixture measured during the dyno test was good. The shop I went to engineers a 600 Holley that they generally recommend for 428's in Denver but based on the results, they felt that they could not improve on my carbs performance.

I currently run a 14" X 3" round air cleaner. I put on the S&H for shows. The carb sits on a 1/2 inch phenolic spacer with a 1/4 inch heat reflective gasket. At our altitude, the fuel vaporizes much easier than at sea level, so I need to keep the bowls as cool as possible. They dyno runs were conducted without an air cleaner.

Wayne - can you elaborate more on timing?