Posted by Dan Starnes (IP: 209.119.6.162) on November 05, 1999 at 20:31:06:
In Reply to: Right and wrong posted by Charlie on November 05, 1999 at 12:15:58:
: You're wrong on the firing order. Perhaps all post '76 truck engines had the 351W firing order, but the Crown Vic's had the old 302 firing order until 1990. Believe me, I know, we had a Mustang in the shop someone had replaced engine w/Crown Vic long block, car wouldn't run, had to switch ECM pins for the cylinders to make the firing order the old-style, I am not wrong on this one.
: Forged Pistons started in 1985. They continued for awhile but where never available on the SN95 models. I think they started using hyper's 1992 or so.
: I didn't know about the valves- but I knew the heads were different somehow. -CP
: : All post '76 302s have the same firing-order as the 351W (1-3-7-2-6-5-4-8) regardless of whether it's an H.O. or not...Also, the H.O. had the 351w valves (1.84/1.54). And I don't believe the pistons are forged (although I could be wrong on that one); I think they were hypereutectic cast...
: : : The non HO motors have a different cam, pistons, & heads. The cam is roller in the HO, the pistons are forged (up until 1993, I think, not sure). The firing order is also different, as the HO motors have the 351W firing order and the non HO's have the old 289/302 firing order. The best thing about the late model truck engines is they have the same block, crank & rods as the HO. So it is easy to make it an HO motor if you rebuild it. Buy a set of roller lifters and retainers, roller cam, good aftermarket forged pistons and a steel dist gear, and its basically an HO motor. (You cant convert the older blocks to roller cams because they are not machined as such; it can be done with aftermarket cam & lifters, though.) The HO motors also had a dual roller timing chain and a few other things to make less drag, but if you rebuild a late 302 well, its as good or better than a stock HO motor. -CP
: : : : I have stumbled across a 1987 multi-port fuel injected 5.0 that is in a full size van. does anyone out there know how this motor compares to an 87 5.0 HO in the mustangs. (diff cams, compression ratio etc?) Thanks.