Our P12 is now 30 miles away, at a body shop.
When we get the Coach home, I can get
to the PCM easily. It is bolted to
the driver's side radiator frame, right on top.
I can get you the numbers. There was a calibration
re-flash from GM for this L21--#98060...
Most everything about the L21 is different except
for the 454 cu. inch displacement. Remember that
this is a 1998 vintage engine. It has many design
parameters that did not show up until the birth of
the 8.1 Liter in--I believe--2000 or so. It is not
cammed for anything like what you would consider
high (er) RPMs. It is built for torque and torque only.
Peak power (torque) is at 3200 RPMs and the engine
has many governors built into it, both mechanical and
in the PCM.
Steady Eddie
1998 P12 L21