Originally Posted by
Nathanl25
The only difference that i knew of between the regular 5.0 and the H.O.'s, was that the H.O. had a different taller cam lobe and firing order. Allowing it to breath better and run smoother, while making more horsepower.
5.0s in trucks did not come with roller cams. The firing order was also different, actually, the old, familiar Ford V-8 firing order from years back.
5.0 H-Os as used in Mustang (and maybe Lincoln), had a REVISED firing order, which Ford claimed RELIEVED some load on the FRONT MAIN BEARINGS. Thus, messing with interchanging camshafts causes plenty of confusion, due to the firing order difference, not to mentioon the fact that H-Os had STEEL gears on the distributor shafts, which would EAT the cast iron gear of the flat-tappet camshaftr, if used with an H-O distributor gear.
(watch the locations of those plug wires, guys!).
impish