“In a drag race application, this is fine. So I think the results we saw, where there is a slight divergence in the curve over the 4150s might be as much related to bore-spacing with the bores being a little better aligned over the ports.” “There’s about three or four times that much on here right now. “The math says this combination is supposed to use about 1,000 cfm of intake flow,” explains Brule. The combination topped the charts, making 754 horsepower and 624 lb-ft of torque. Each of the 4500 throttle bodies is rated at 2,000 cfm for a whopping 4,000 cfm of airflow available. He says “obviously” because this is the combination with the most intake flow. “ was obviously the winner,” says Gearhart. However, it will still decently illustrate the differences between the different models of manifolds. One thing to keep in mind with the absolute numbers presented on this dyno graph is that this engine is a pretty stout combination. Besides making a convenient test methodology, it also shows the versatility of Holley’s Hi-Ram intake manifolds. The particular lower intake manifold used in the test has been ported to match the cylinder heads by Brett Barber of Air Flow Solutions. Now just to be clear, three of the four intakes tested all use the same Hi-Ram lower intake. With Holley’s Mark Gearhart and Westech’s Steve Brule analyzing the results, it comes down to way more than just peak power numbers, as they point out. So, using a 440 cubic-inch LS engine (we covered the short-block build here, and we’ll have the long-block article up soon), Holley went to Westech Performance Group to test out four of the most popular LS intake manifolds they make. With Holley Performance leading the way and creating a plethora of intake manifold options for the platform, the team realized that with all the different options now available, it could be confusing as to how each different iteration performs. Whether you are a fan of the Bowtie or not, there is no denying that the LS platform has some of the strongest aftermarket support of any platform, ever.
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