![]() ![]() Compression ended up at 10.1:1, which allowed us to run this engine on pump gas, though we ran Rockett Racing fuel to ensure consistent performance. The point was to make the engine dead-reliable. We also added a set of Crane Gold 1.5:1 roller rockers and proper-length Crane pushrods to ensure a stable valvetrain. The cam we chose is a Crane with sufficient specs to push the peak-rpm point up to 6,500 rpm but is still suitable for the street. The heads feature a 215cc intake port with 2.08/1.60-inch stainless-steel valves and roller springs capable of controlling the mechanical roller cam. We upgraded the heads to a pair of TFS Super 23 aluminum castings to ensure we got the most out of each intake. You may recall that Rodney spins an internally balanced 4340 Scat steel crank, Scat I-beam rods, and a set of Icon forged pistons. So if you only take one thing away from this story, burn average torque into your memory bank. ![]() The only instance where peak horsepower is really critical is if you have a close-ratio, eight-speed trans that can keep the engine within 1,000 rpm of its peak-horsepower rpm, but since we're not talking about Formula 1 here, that isn't really relevant to the average car crafter's car. ![]() You might have a manifold that makes good peak horsepower, but if it loses torque in the middle rpm band, the peak-horsepower number is not nearly as important as the average power. Apply a higher average torque, and it will accelerate any vehicle quicker. You will get tired of hearing that in this story because that's the hammer we're bringing. We think average torque is the most important factor that we measured in this test. We've also calculated average torque between 3,500 and 6,500 because that is the rpm band where these engines will spend the majority of their time during a quarter-mile run. We measured plenum depth because that's important for making good power. We measured carb pad height because the manifold has to be able to fit under your hood. For this latest adventure, we assembled 19 small block Chevy single-plane intake manifolds and ran them all across a 550hp, 406ci small block Chevy. ![]()
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