The Grumpy Grease Monkey mechanical engineer.
these dyno print outs are suspect due to all the torque and hp graph lines not crossing at 5252 rpm
all these SBC engines use similar parts, WATCH THE VIDEO..and notice the larger displacement produces better lower and mid rpm torque,
all those engines benefited from a swap to a better cam, back in those days with manual transmissions and high compression
a crane 110921 solid lifter and a crane 110741 hydraulic flat tappet and similar cams
and yeah, a 350 crank in a 400 block mandated using spacer bearings,
as the main journals on a 400 crank and block are larger in diameter
to build a 377 easily beat all of them with that 110921 cam, the smokey ram intake a 780 holley and decent aftermarket heads
if you lived through that muscle car era, you know there was a great deal of mods that could be done to either engine to boost power significantly over the stock number,s
and , swapping to vastly better flowing after market heads, swapping in a 377 or 383 short block on the chevy engine cars,
a different flat tappet solid lifter cam would certainly be popular options in the chevy builds.
yeah no longer a 302 but I lost count of the guys I helped do similar mods who for decades claimed the camaro z28 they drove was "stock"
crane cams sure sold a bunch of 110921 flat tappet cams,
CRANE 1.6:1 roller rockers
and at that time the smokey ram intake
and brownfield or similar aftermarket heads were the hot ticket, and Id bet a serious percentage of the 12 and 11 second camaros with "STOCK z28 engines" had thay crane cam and displaced 350-406 cubic inches and were not using the original heads back in those days.
I know I was VERY busy building and installing 377, 383 and 406 SBC engines with that crane solid lifter cam, roller rockers headers , 3" dual exhaust, 3.73:1-4.11:1 rear differential gears and swapping clutchs and smokey ram intakes with aftermarket heads made by brownfield, DART and CANFIELD in the mid 1970s-1980s
keep in mind BBC or SBC most seriously fast cars ran a manual transmission back in those days
I never had any problem building 427 BBC engines with chevy 3959180 solid lifter cams,
factory open chamber rectangular port heads ,a dual 3" exhaust, low flow restriction exhaust, and 3.54:1-3.73:1 rear gears,
and 12:1 compression short blocks that ran circles around the 302 z28 cars either
but then SUNOCO 260 gas was easily available for under 45 cents a gallon also
and you could pick up a new vertex magneto for a couple of hundred dollars back then also