Originally Posted by killerformula
I can understand your point, but we're taking these non-scientific terms like "RPM engine" and "loves to spin" and trying to tack on a quantitative attribute to them. The problem with both motors is that unless you spend the money on internals, you're not going to run more than 5500RPM. A 350 CID chevy motor with stock internals is about a 5500 RPM redline motor. Why then, would a 377 with the same stroke be able to rev any better? A 377 with some high buck internals will probably be nicely efficient at a higher RPM, because of the large over-square. The issue is that stock rods are going to stretch above 5500 or 6000 on a regular basis, not to mention the fact that those big 400 CID slugs on the end of them weigh more than a normal 350 slug does. So now you're talking high dollar rods, a big cam and some upper-end heads to make your 110% VE at 6700RPM. Furthermore, to do that you've lost a bunch of power between 0 and 3000 RPM and your motor is basically a race-only setup.
So I guess what I'm getting at is not only is a 400 a better overall choice, but dollar for dollar if you want to start spending money on internals and give the 400 a bullet-proof bottom end like the 377 will need, you'll see the difference even more.
i have a 377 and i spray it i have made a 427 406 and a 434 the 434 makes the most power but when sprayed the 377 out preforms the others i ran 250 shot to all made 6.90 pass in the 8th with the 406 a 6.72 pass with the 427 a 6.28 pass with the 434 and a 6.19 pass with the 377 . i shift it at 7800 rpm and have a 3255 lb 1970 chevelle so i like the 377 over all combos but for just motor i would build a 434 or 427 with the 400 block but if spraying go with the 377