at one time engle had a "blue sheet" that had their specs which included the .904 lifter profiles, and other .842 types. it may still be available. those .904 lifter profiles aren't fast compared to the comp xe's or hl profiles, but are faster than stock or some cranes. what I've noticed is they have a ramp profile that seems to be unique. they don't accelerate the tappet fast and then hold the valve open over the nose longer like comps. engles tappet speed seems to be fairly constant, using a higher lift, less nose radius, and then letting the valve close at a little gentler rate. the k65 i'm using now has a fairly long closing ramp which should be easier on the valvetrain. I did use a hughs/engle 2330 once in a stock 6pak type engine with stock exhaust. it did make the most power of the cams I tried. the comp cams magnum replacement was the worst with the mopar 272/.455 somewhere in the middle. I do believe something like the summit 6401 would be the most promising for stock type stuff. it has very good low and midrange torque for iron heads and stock exhaust. I do think the real issue with stock iron intake and exhaust is the restrictions on both ends; intake and exhaust. restrictions on one end are probably easier to deal with rather than both. the only thing I think makes sense is just work the middle. with restrictions it takes a bunch of compression to hang on to the top end rpm and that means race gas which I refuse to get caught in that trap. of the stock type cams I've used none where the "silver bullet" and I don't think there is anything that will be arms and legs above the others. I've had some ideas of custom cams just for this type of work, but truth is i'll probably never do it this late in the game.
