Does HP 383 have more of a loping sound than stock 383 ?

[Racer57]

I was told that my 1970 383 is an HP. But while the engine runs very quiet with stock mufflers and resonators and smooth, I would think that the HP383 would have more of a loping sound to it. Is there a difference in the sound ?

 It has a 600 Eldebrock and I'm going to put a 750 on it this winter with possibly an Eldebrock intake once I know for sure which factory intake I have.

[cudabob496]

All my 8th edition Mopar engine book says about the standard 383 is the cam
had a total duration of 256 degrees.  And the high performance 383 had a cam
with duration of 268/283 total, with a valve lift of .450 inches. Book implies
your Cuda had the 268/283 cam.


wow, just noticed the 1962 to 1964 max wedge engines, ie the 413 and 426 Stage III,
came with a mechanical cam with 300/308 duration, and .520 inch lift!  Thats some
serious cam for 1962 to 1964.  But, they had compression ratio up to 13.5,
that could take advantage of that much duration. I heard one of those engines at a show once.
Serious lumpy sound!  Kept thinking the engine was gonna stall!

[todd383]

HI po 383s run smooth, had a bunch of them. my dad has a lo perf. 383 in his fury, sounds the same.

[Strawdawg]

the factory cams are often milder than the specs might suggest due to the conservative lobes...I would expect it to sound very little different that the milder cam in reality

[Aussie Challenger]

Back in the day buyers would buy a HP engine car for the more flexible driving that the motor would give but didn't want the other idiosyncrasies of a true performance motor so there was very little difference at idle and low speed,  just could spice things up a bit if the right foot was used.