P code 400 cars. Let's see your car

[Thunderdan]

Now we are mudding the waters with the U code! Im confused as well.

Up until '75, all U code (E86) 440's used nylon teeth on their timing chains, however beginning that year, the E86 engine was revised to an "endurance" engine, which featured many of the features outlined in Post #34, but also hard chromed exhaust valves, moly-filled compression rings to reduce wear, and of course, double roller timing chain, among other upgrades. This applied to 49 states, except Cali, which couldn't get the 'endurance' engine, which was primarily for law enforcement. The standard E-85 440 4 bbl (which also had a single exhaust and a measly 195hp in '78 tune) continued to use the nylon timing chain and standard parts through the end of the big block production in '78. The E86 Hi-Po also got the hotter camshaft through '78 which helped it achive the 255hp and 355 lb ft in it's final year, even with the lean-burn.

The E68 400's also got the "endurance" upgraded features in '75 as well as the E58 360 4 bbl.

That said, I also have a motorhome 440 from 1978 that has the double roller timing chain as well as the exhaust valve rotators, but the small E-85 cam, which all makes sense for a low-ish output application where durability is the objective.

 

[Fm3 Dart]

Check this beauty out!
The air cleaner surprises me though. Seems like there were a few variations on the air cleaners. I was under the impression that the P code E68 Hi Performance 400 came with an orange dual snorkel in 75. Maybe it was a noise- California type thing and some cars got different air cleaner depending on that?
Always learning.....

2,400-Mile 1975 Plymouth Road Runner 400