> I was given a 302 H.O. (so the guy says) out of a 1991 Ford F-150.
F-150's never got the H.O. The H.O. started as an optional engine for
the Mustang (and similar Capri of those years) and continually evolved
through the years. Most of the changes were positive, though some were
to cut cost (e.g. replacing the forged pistons with hypereutectic pistons)
or make the engine quieter (revise cam profile). The Lincoln Mark VII
2-door coupe got the engine as standard but I believe they retained the
speed density fuel injection, even after the Mustangs had switch to mass
air. Eventually, the Thunderbird got a version of the HO as well.
The Thunderbird and Mark VII versions put out somewhat less HP due to
intake and/or exhaust restrictions.
> It was a long block only.
The truck long block should be similar to an H.O. The H.O. heads were
simply E7TE truck castings. The F-150's got a milder camshaft and
more restrictive injection system, among other changes. The Explorer
and Mountaineers actually got better heads and intake (GT-40P) than
the Mustangs (except for the GT-40 equipped Mustang Cobra). How much
do you plan on re-using from the longblock?
> I tore it down and have only found a few numbers on the block:
Look for a casting number like E6SE.
> Can you guys tell me what engine I have from that???? It has a roller
> cam in it also.
All the 5.0L engines went to roller cams, even the standard passenger
cars. You'll need to check the block and head castings. Be aware
that even among H.O. engines, there were a lot of variations from
year-to-year. Compared to a standard passenger car 5.0L, my 1987 H.O.
has these differences:
forged flat top pistons (pistons are usually slightly above deck at TDC
to maximize quench, the compressed gasket provides required piston to
head clearance)
double roller timing chain
metric low tension
oil rings
double sump pan with low
oil level sensor
chrome plated valves
hotter roller cam with 0.440" lift
351W firing order
E7TE "truck" heads
60mm throttle body
intake manifold with larger ports (both upper and lower)
different EFI computer
cast aluminum valve covers (will work with roller rockers if
filler neck baffle removed)
true dual exhaust
different brackets and accessory locations
Dan Jones