Thanks, I did use that but my results are quite different. For example, that calculator indicates that I should be running 2830 at 65 mph but my tach only reads 2150. I have a 3 speed on the column. What are others seeing at that speed?

~Denny
1953 Chevy 3100
w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter
In the Gallery Forum
1998 Chevy Suburban 350 ci awd/4wd