360 vs 383

rmchrgr said
There's certainly 360-based dirt track or Super Stock engines out there making close to 2hp/cube,

rmchrgr said
but I rarely if ever hear about 383-based engines putting up those kinds of numbers.

Cause most would start with 400/440 don't mean a 383 can't, it's got enough bore and can take most of the same parts.

rmchrgr said
600, seems reasonable but 7-800... I don't think so.

Torque at peak hp is around 90% and peak torque for this kind of build should be able to get around 1.4 lbs-ft per cid so 389 x 1.4 = 545 tq x 90% = about 490 tq @ peak hp, 700 hp x 5252 / 490 tq = 7,500 rpm
and 800 hp 8,575 rpm give or take depending on efficiency. Seems like possible rpm's and we know we have heads more than capable of these power numbers, A 400 would still need to rev similar, stroke would be the main thing to bring the rpms down whether it be 383,400,440 since the bore sizes are fairly similar.

Any engine running at similar efficiency making similar hp per cid would run at similar rpms.