Originally Posted by AndyF
Originally Posted by sam64
Originally Posted by fast68plymouth
That’s a really small cam for a 12.5:1 505.

Shift point is dependent on a lot of variables....... but I’d say with an appropriate gear and converter....... somewhere in the low 6000’s.
Just experiment and see what goes quickest.
What would you recommend ? It is a 3300lb bracket racer,2" Headman Hustler headers,4.30 dana 60,727 rmvb,4800 Dynamic foot brake conv.9x29.5x15 m/t slicks.I like to stage at 2100 rpm.


Is the car running now? If so how fast does it go? 650 hp will put you right at 10.0 and 135 mph. With your tires and gear you would be going thru the lights at 7000 rpm if you run 135 mph. So I think you have too much gear in the car for your engine combination since your cam is too small to pull to 7000 rpm.

How fast do you want to go? Once you know how fast you want to go then you can figure out where the engine should peak at and then you can pick the cam.
I took the car to the track for the first time with this motor and 6.73 @ 101.37 shifted @ 6500, same as the 11.1 SR headed 499,.580 solid ft. I pulled out .I was hoping for 6.40 with the 505 as setup.seems like I am missing about 75 hp.