There’s a lot of variables but, theoretically if you put the same heads on the same engine with the only difference being one has big valves vs small valves, the big valve head should outperform throughout the entire rpm range since more air can be moved than the small valve heads.
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1967 GTO, 432 (428+.030), 4-bolt mains, factory Nodular crank, scat rods, icon dished pistons, Lunati HR 243/251@.050, .618/.622 lift, Edelbrock 72cc round port heads, 10.5:1, offy 2-4 intake, Edelbrock 650cfm carbs, Super T10 trans (2.64 first), BOP 10 bolt w/ Eaton posi and 3.36 gears
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