I pulled out my 70 parts manual myself...looked to see what the difference was between a 330HP 383 and a 335HP 383 in model year 1970.

The book lists a piston for a 2 bbl motor, a .020 O/S piston for a 2 bbl motor, and a piston for a 4 bbl motor. Note no different pistons for the 4bbl motors in 1970. They also list special "low compression" pistons for export..no model year specified. BTW, compression on the 383 in 1970 was 9.7 to 1, not 10.5 to 1. Even in 1968, the 383 HP engine had 10 to 1 comp, not 10.5 to 1.The owners manual on a 70 B'cuda states 9.7 to 1 for the 4bbl, 8.5 to 1 for the 2bbl 383, and also there is no differentiation between a 330HP engine and a 335HP engine. They only list a 383 2bbl and a 383 4bbl in the owners manual.

The cams have what looks like two listings...a 4 bbl cam with a .05 raised ring, and a 4bbl cam with out raised ring. Maybe someone can check in as to what this "raised ring" reference means?

As has been stated, the carbs are pretty specific to options, etc..on whether you got a Holley or a Carter. No mention of any 383 335hp or 330HP anywhere. No mention of a 383 4bbl NON-hi performance version engine there. Could a carb difference make a 5 HP difference? YES!

I looked thru the factory service manual to see if there was any different cam specs listed for the 383 4 bbl in 1970. The cam specs only show a 4bbl version, and a 2 bbl version. NO mention of any different cam specs for 4 bbl engines. One set of specs for 2bbl versions, one set for 4bbl versions.

I looked at the front of the FSM for the VIN decode...what it says is L=383 and N=383HP. Now seeing that there is no reference to any different 383 4bbl motors in either the FSM or parts book, it's obvious that the L or N in the VIN refers to a 383 2 bbl motor as a L code, and the 383 4bbl motor as a N code. So all 4 bbl 383's in 1970 are HP motors.

Why would ma Mopar have a VIN desigination of L equal either a 383 2bbl engine, or a 383 4 bbl engine? Those two engines have MANY external differences, IE...carbs, intake and exhaust manifolds, air cleaners, etc (not to mention the internal differences I show above)..that would cause WAY too much confusion when ordering parts.

So, is there a 335HP and a 330HP 383 in 1970 model year? From what i can see in the parts and service manuals, just a marketing ploy if anything. If i have some time, I'll research the 68 and 69 parts books i have to see if two different versions of a 383 4 bbl engine show up.

I just did a little further research as to heads/valves in 1970 383 4 bbls. looks like there are some differences in valve sizes on 383's in the non-performance car engines ( C bodies )but in the B and E body cars, all the 4bbl valves and heads are the same. Same with valve springs also, there are different versions for performance oriented car lines ( B and E ), and a different spring for the C bodies. No different springs amongst a car line. So, seeing this...there was a different 4 bbl 383, but it was used in the C bodies, and not mixed in like model lines. So there seems to be more here than just marketing, but different 4bbl 383's were not used from what i can see in the same model.

One more thing...what code on a broadcast sheet calls out a 383 4 bbl non-HP motor? E63 = 383 4 bbl HP, and E61 = 383 2bbl. Where is the 383 4 bbl without the HP designation?