Yelo

Yeah, sorry I forgot to mention that we were comparing a car to a truck motor, I figured my sig would give it away.....but since so many of us on here use CAR performance parts on our TRUCK motors I figured I could at least glean some useful information out of you guys (and I have)

The only arguement I have is with the statement Black02Z71 made: That the mod motors are only good at lower RPM's. That may be true for the 4.6/5.4 in the trucks but in a car they are extremely rev-happy....mine is pretty unimpressive below 4000rpms, and with the new heads/cams I'm going to turn 6700 with a 3400rpm stall torque converter, I do agree though that the 4.6/5.4 in a truck is gutless after 3000rpm......Part of the problem is what treyZ28 stated: that the 2v mod motors make great torque down low, but with aftermarket cams and ported heads they do keep breathing and holding a somewhat steady torque curve (therefor continuing to make horsepower) well north of 6000rpm....this works well in a 3100lb Mustang running around on 26" tires, but you put it into a 4600lb truck with 30" tires and what you end up with is a slow truck that does great burnouts......

I guess what amazes me is that of you look at port flow numbers the 4.6 shouldn't be able to hang with the 4.8.....but it does so pretty well