Ok, so you say that its not possible to make a small displacement motor scream on the cheap? Then theres an Easy way to figure this one out. Everyone take a motor that they have a preferance too. Assemble that parts needed for a good "go fast" motor and do it at the cheapest possible. Links would be a plus also. I personally would post a few choice parts for the 4.0L/4.2L but clifford performance seems to be offline. But anyway, theres only a few things that can change a motors HPand Torque ratings. Compression, Head design, and flow. I dont remember who said it but someone said "A motor is a big air pump". Well, lets see who can make the best theoretical motors on the cheap. Me, I'll be back tomorrow with the famed 4.5L AMC/Chrysler I6. And yes, they can be built on the cheap And get good mileage to boot