For me it's a decision between extracting every hp possible or sacrificing some hp for the stock look of RA manifolds. I have about a 415 hp 455 in my '72 LeMans right now with RA manifolds and will start on a 600 hp 494 ci motor soon to replace it. I'm struggling with should I use RP RA manifolds or headers? I have both, but I don't really want to move my brake lines and metering block that's on the frame in the way for headers. It's a 50/50 right now, but I'll probably end up with RA manifolds (2.5") since I'll never race the car.
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1967 Firechicken, 499", Edl heads, 262/ [email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule.
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