[73ta]

Originally Posted by AG

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.

600hp 494" RA manifolds won't flow enough for that engine IMHO.