the light duty version had 2 engine options, the 4.6L V8 and the 5.4L V8, both had the new modular motor that was optioned to a f150 from 97-03, but the heavy duty version of 97 (obs 8 lug) had the 351W, 444 turbo diesel, and 460. i only like this particular body style tho, hard to find a good one, SD's are a dime a dozen in good condition