Stroker specific cams?

nm9stheham said
IMHO.... A lot of what is being missed here is that you are going to use EFI. One key on the cam used for that 351W EFI build is that the LSA is wide... in the 112-114 range.... to keep the MAP sensor stable at the lower RPMs for stability in the EFI system. The lobe shape has little to do with that, so don't get hung up on ideas about the XFI lobe being particular in that regard.

Your desire to not give away a broad performance envelope will drive you smaller durations, not larger ones. Your car driving description wants a very broad torque curve that reaches well down towards 2K RPM, and puts much less emphasis on peak HP. (But you will get good power from your breathing parts on your engine anyway. 'Drag race' grinds are not what you want.

The duration spread has more to do with the valves and ports in the engine and little to do with RPM range or being EFI or carb.

All good points, and something I was aware of. Below is a dyno sheet from ATK's 408 create engine, the cam specs are 229/233 @050 .520in/.515ex 110LSA. I found it to be a shelf Howards Cams grind with using a 1.5 ratio rocker. Their website states a 1.6, so maybe they have a custom grind? Anyway, by using the 1.6 on the shelf cam the lift goes to .555/.549 which would be fine with the extra flow from the TFS heads. With the springs being rated at .650ish lift, not a spring killer, as long as the pressures match up. I have considered using this cam, but like many wondering if there is something better. The torque curve on it is very street friendly, and I would think, a blast to drive. The counter part to this cam would be the custom cam that Brian at IMM recently used. It used [email protected] on the intake with 580ish lift IIRC. I'll have to talk to him about that one though.

Dyno Sheet.jpg