It also has slightly smaller, very long runners that allow it to deliver a wide powerband perfect for dual purpose cars, road course racers and more. This a radical departure from the cast aluminum Hi-Ram intake and uses a high-tech polymer construction, which makes this intake manifold extremely light, and have excellent heat rejection properties. MSD's polymer intakes are a great option for dual purpose cars and generate an extremely wide power band.įor our fourth and final intake combination of the day, we utilized an MSD Atomic AirForce intake. Brulé attributed the slight horsepower dip to both the lower airflow of a single throttle blade as well as plenum volume and the position of the throttle blade in relation to the intake ports. While a 22 horsepower drop from the dual 4500 throttle bodies, this setup offers a much more progressive throttle opening that will deliver significantly improved drivability compared to either of the dual-quad throttle bodies. On the dyno, it delivered 732hp and 606 lb-ft of torque.
#HOLLEY INTAKE MANIFOLD UPGRADE#
This throttle body flows a huge amount of air and is an upgrade form the standard GM 90mm throttle body. For the first test, we equipped it with a 105mm Holley EFI billet throttle body. This plenum is hugely popular with LS enthusiasts and is a great option for naturally aspirated and boosted applications. Holley's single throttle body plenum (PN 300-246), complete with Holley 105mm throttle body is a very popular combination that makes great power and is perfect for power adder applications.įor the next test, we unbolted the 4500 plenum and moved to a single throttle body, front-feed plenum (PN 300-246). Holley Hi-Ram with Dual 4150 Throttle Bodies Each of these intake configurations represents a popular combination used for a wide range of racing types, so putting them all on the dyno with the same engine would paint a very clear picture where each of them shines. The intakes set to be tested were a Holley Hi-Ram with dual 4150 throttle bodies, dual 4500 throttle bodies, a front feed plenum, and MSD’s popular Atomic AirForce polymer intake. Gasket electric water pump supplied dyno coolant, and the exhaust consisted of a pair of Hooker stainless steel headers." The ignition system consisted of MSD, LS-style coils, a Mr. This engine was built to run on E85 so it uses a 13:1 compression ratio, an LS7 style cylinder head and a robust valvetrain capable of over 7,000 rpm. "There’s no discounting the popularity and proven performance of the LS engine architecture, so for this test we recruited a freshly built 440ci, LS7-style engine. It features 13:1 compression, Holley EFI, and a fully CNC'd top end. The test mule for this dyno session was a 440ci LS7-based engine that was built to run on E85.
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