You'd think they'd get this right, unless they got fudged numbers from Ford. HP/TQ is all over the place on the 351, from 210hp/315tq from 89 to 92, then it shows two different ratings in 93 & 94. First is H code @ 200hp/310tq and then the "R" code @ 240hp/340tq. I wonder what the difference could have been ? The 95 & 96 shows 210hp/325tq for the H code, with the R code dropped. Could it be the Lightning motor is the R code ? In a van ? But then there's the change in cams in the 94 to the F4TE roller in the mix. You would assume that the 240hp/340tq would be the roller cammed engine, but that's not explained with the R code being dropped in 95-96. I found discrepancies in the engine specs too, in cam specs and valve sizes along with more in the years listed for some specs. The 5.0 is listed as having smaller valves than the 351, although they both used the same heads. Go figure. More instances where you cannot trust the info in printed manuals

 

That's the Lightning motor believe it or not, they were smothered from the factory just as badly as all the other trucks. [/quote]

 

I think they fudged the numbers for the roller cammed 351. There's got to be more than a 10HP/15TQ difference there from the flat tappet engine. They show a 20hp diffference between the 94 and 95 5.0's, even though they both had the F4TE cam. Like I said, the numbers are all over the place.

 

Yeah they got it messed up. There was very little difference(all stock) in the 5.0 and 5.8 motors back in early days.. '87-91, but from '94 on they were both noticeably more powerful and the difference in them was larger. A possible explanation... Ford changed how they rated engines at this time, you would see similar inconsistencies if you looked at the ratings for a 5.0HO Mustang for the same time period, they went form a 180-200hp motor in 1986 to a 225hp motor in '89-91 and back down to a 210-215 rating for 94-95 even though the later motors were more powerful than anything that came before.

 

Ford made some minor changes in the HO roller cams, then there were exhaust changes too in those years. Then there's the intake revision in the SN95's. The 86 to 87 difference was purely in the head change from the E6 to the E7's. Everything is covered in their Mustang 5.0 book as far as the Stang 5.0's, some of the other 5.0 differences are in there too (truck/van, Crown Vic, etc) I'd be curious to know what the actual figures are for the pickup/van 5.0 and 5.8. Clearly, it's not in the Chiltons manual