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The parts catalog and service manual (Plymouth) lists 1970 383 4bbl's intended solely for B/J/R/W as having the 440HP valves & valve springs. All others by D/P/C, including the 440/350hp - recieving the 383 2bbl parts.

Some things to consider...the parts books evolved as time went by and becomes a general reference for service and parts managers. As seen in other threads, there are numerous variations of applications that are not specifically addressed in the parts books or shop manuals. What is printed tends to be a generalization to cover most vehicles a service reapair person would face as opposed to a specific application.

At the time, ease and convenience for service and parts people was more important than what was technically correct. They were new cars, then they were used cars that needed fixed. They were never meant to be restored 40+ years down the road by anal-retentive car buffs.

There are mistakes in factory manuals and books. Do your own research to confirm what you read in the books. You will find things not address by factory info.

ALL 1971 383 4bbls came with 1970 440HP parts, a Holley and ALL were considered HP. A significant change had occured from those earlier 1969 383 4bbl's that Doug has researched so thouroughly and all his '69 data means very little when compared to these '71 engines. In no way am I taking anything away from him or his research by stating. So how much of that '69 data will actually pertain to the 1970 383 4bbl as well?

The use of the HP designation in '71 goes back to the '67 and earlier meaning. The term HP was used to distinguish between the 2bbl and 4bbl version. The use of HP between 68-70 does not mean the same thing as earlier and later years. Many other factors were starting to come into play by '71 making the use of shared parts more practical. Things evolve and change. What applied in 69 may or may not apply by 70.

When one went to buy a replacement 383 4bbl short engine in 1970 - p/n 3462621 - what color would these have been painted?

In my opinion, due to the difference of only 5 hp and the more wide spread use of the 330 horse engine, it would be much simpler to build and inventory only the 330 horse engines to use as replacements.

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