SBC Main bearing size

[oldhead]

On very high HP (1000+) sbc does the main bearing size between 350 and 400 ? Oldhead

[PackardV8]

On very high HP (1000+) sbc does the main bearing size between 350 and 400 ? Oldhead

On very high HP (1000+) sbc does the main bearing size between 350 and 400 make a difference?

Is it making that horsepower normally aspirated at very high RPM, from nitrous or from forced induction at lower RPM?

[pamotorman]

the overlap between the rod and main journals with the larger mains may keep the crank from flexing as that is why GM made the larger 400 mains larger