Did the 1979 Lil Red Express come with an air pump?
Here is the factory offerings for '75 -
https://www.hamtramck-historical.co...DataBook/1975/75-1-Dodge-engineering_0004.jpg
Note that there were two versions of the E58 that year, federal and CA. For the federal motor, torque peak RPM is the same as for the '74 E58 while the HP peak is 400 RPM lower. And the federal E58 is noted to have an HP cam.
Here is the '76 offerings. -
https://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1976/76-Dodge engineering_0004.jpg
Again with the two versions of the E58.
1977 -
https://www.hamtramck-historical.co...ipDataBook/1977/77_Dodge_engineering_0004.jpg
Note that now no listing of an HP cam version, and the federal version peaks are lower again. Still not as low the CA one, but pretty low. And now 800/1600 RPM lower than the '74 E58.
1978 -
https://www.hamtramck-historical.co...ipDataBook/1978/78_Dodge_engineering_0004.jpg
Interesting that the peak rpm for torque actually went up at that point. I also just noticed that is says the CA E58 did not get Lean Burn. That seems backwards to me.
There does still appear to be a difference in output between the federal and CA motors, but my guess is it is tuning and not that the '77+ federal E58 got the 340 cam. And I find it hard to believe that if the E58 was available at the same time, Dodge wouldn't have dropped it in to the truck as is and called it the EH1 due to a different tune since it didn't have LB, cat's and used dual exhaust.
It's all just speculation, the factory could have done any number of things. Could be the lack of an HP cam listing after '76 was just to condense the listings. And they could have played games with the ratings for some reason. But it doesn't make sense to me that they would put the 340 cam in the later cars. They were fighting to keep up with the emissions laws and I doubt the 340 cam would have helped them. Nor do I see a reason to fudge the numbers for insurance or NHRA factoring by then.
I think the '77+ E58 was still a special motor, and I think the EH1 was even more so. But I doubt they had the 340 cam, they were special for other reasons.