Planning for 408 - Possible Solid Flat Tappet cams

If you care more about autocross than drag race, then bigger is going to not work well. Re-read post #8 several times. Once you talk under 12 ET's, then folks naturally think what will work best for drag racing...and the emphasis on low RPM torque heads out the window. Note the comment in post #17 about not giving up mid-range power... that info is correct but is not autocross-focused talk.

Once you fall off the main mid-to-high RPM torque band of the cam, where the exhaust draw-through is going full tilt, then you lose the torque building effect of that exhaust draw-through and you can only depend on cylinder pressures for your low-to-mid RPM torque. Too big of a cam duration hurts that, and too much overlap makes the lower RPM torque drop off even faster. With a 4 speed car in autocross, road race, or rally, that becomes even more critical; you don't have the torque converter as a way to 'adjust' around that; bogging off of corners starts to happen and you can only address that with more gears and/or close ratio gear boxes.

So IMHO this is kinda at a point where you need to choose the engine/car use emphasis. Great drag racer or a great autocrosser? I am seeing a lot of awesome drag racing info.

If for autocross and therefore not sacrificing low-to-mid RPM, my first instinct is that this going a bit too far the wrong way IMHO. I am only guessing at the advertised number that the Jones cam has... did they give you that number?

What RPM range did you spec for this cam with Jones? How did you characterize the application? The stroker inherently will be more limited at the high end of the RPM range, and too big a cam and narrow LSA will make the torque fall off too quickly at the low end of the RPM range and you end up with a limited RPM band that does not work with the gearing.

BTW, my racing background is rally.... BTDT that with too limited an RPM range... it sucks. There is a lot I don't know but that part I DO know LOL