At 20:25:39 PST on 12-09-00, Mark Bliss wrote: on my 89 f-150 I used comp cams #35-408-4 also installed 1.7 ratio roller tip rockers,instead of 1.6, lots of power at 3000rpm to 5500 also fuel mileage of 22 or better if run in that range (4X4 as well)but... Login to read more.