Hemi does well/better when tuning & mods are allowed
or when boost is added
or a professional driver
the 440-bbl HP was a great street killer
I've had a stock dual in-line Carter AFB 68 Hemi (427.5cid)
dyno-d as delivered pretty-much bone stock, just cleaned up a tad
(rebuilt as close to stock as possible, 0.010" over bore,
a little blueprinting, balanced with better tolerances)
it delivered like IIRC 484hp @ the crank at like 6,200,
may have been 6,500 rpm
disclaimer;
don't mistake what I'm gonna' say next;
the LS6 454ci & off-road available GM performance LS7 454ci
more compression
both all Iron canted valve-d/rectangular port BBC's
great cylinder-heads, longer stroke, 4",
1/4" more than the 427 3.75" (or the 440 & 426 stroke)
LS6 rated at 425hp 475tq (11.25:1) at far less than it's red-line,
5200rpm or something, way under rated & ran on pump gas
& over 500hp @ 7,000rpm capable with very little tuning
& the LS7 465hp (11.25:1) @ like 5200rpm,
490ftlbs of torque @ like 5,200rpm
then near 8,000rpm was more the real red-line before nosing over
respectively out of the box near 600hp, 500+ tq on 97 oct. pump gas
in 1970-71 & using points/**** ignition systems
with an alum. Winters dual plane single 4bbl & Holley 850dp
even with all that, it was way underrated too
L88 427ci 425-430hp 12.5:1 20 made in 1967 - IIRC 80 or so more for 68 & 1969
with the snowflake Winters Alum. cylinder heads,
& Winters alum. dual plane 4bbl intake, Holley 850dp
were no slouches either, also way under rated, like 100hp underrated
they were not intended as a street engine,
they (dealers) were discouraged from selling too many,
to novices they preferred selling to known teams & competent racers
they were all rated "as lower respectively 425-430 HP",
for that very reasoning
people wanted the most advertised HP, they could get, bragging rights etc.
that was usually the 427ci 435hp Tri-power in the Corvette
the L88 made easily 100+ more
