The 340 is the biggest POS V8 Chrysler ever made.

MOPEkidD-3 said
I was thinking those same issues, Mopars and Chevies were very similar but the small differences were where it mattered.

Also are you taking about the oiling circuit? Didn't Chevies use that obsolete inefficient dual-rotor oil pump though, not like the Mopar gerotor type? Always hear about Chevies slowly building oil pressure with RPM but Mopars hit max oil pressure basically off idle... really nice for off-roading or pulling heavy loads at low RPM

Not so much the pump but the way the oil galleries are laid out and when the connecting rods get oil.

The spur gear oil pump has some advantages. It produces less oil pulses per revolution and it doesn't require the pickup diameter to be quite as big.

Other than that, the gerotor pump will produce more oil from a pump of equal size.