This Youtube video just came up on my feed, it comes up with contradicting results, but interesting none the less.
It's very similar Chevy 302 vs 327 vs 350 Dyno results, and 4.8l vs 5.3l results, there's a 6.0l but it's cam and heads are different than the other two. 350 has a slightly milder cam but everything else is the same.
302, 357 hp @ 6700, 333 lb-ft @ 4400, 1.18 hp per cid, 1.1 lb-ft per cid, 585 cfm
327, 356 hp @ 6100, 369 lb-ft @ 4100, 1.08 hp per cid, 1.13 lb-ft per cid, 577 cfm
350, 354 hp @ 5400, 391 lb-ft @ 4000, 1.01 hp per cid, 1.12 lb-ft per cid, 547 cfm
4.8l, 336 hp @ 5600, 345 lb-ft @ 4700, 1.14 hp per cid, 1.17 lb-ft per cid, 475 cfm
5.3l, 353 hp @ 5200, 384 lb-ft @ 4300, 1.09 hp per cid, 1.18 lb-ft per cid, 489 cfm
With the 302 vs 327 vs 350 goes along with what I'm saying for similar top end hp is gonna be about the same hp and peak hp rpm and the powerband is gonna be proportional to engine size. The 302 vs 327 match that theory but 350 falls a little flat, should be more like 5700-5800 not 5400 it is but it does have a smaller cam and the hp curve is super flat though out 5100-5900 rpm, to me any minor timing or carb adjustments peak could be moved anywhere between the two.
Obviously torque is different overall but per cid it's fairly narrow. But if you geared these engines to where your right in the sweet spot for each, about plus 500-700 rpm per mph as you go from 350 to 327 to 302, you can see the 327 would be at higher hp level then the 350 and the 302 be above both through out most or all the powerband going down the track, would of been nice if he overlap the hp curves. So anyways with these examples I'd say 302 would best track car and 350 best street car. Either way very similar performance from similar parts but very different displacements.
As of what to make of the 4.8l vs 5.3l results I'd say 17 hp isn't the biggest difference tha'ts a 0.05 per cid difference, you could make the argument it's from stroke to me I'd guess more from heads and cam preferring the 5.3l.
