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73-87 Chevy _ GMC Trucks => Performance => Topic started by: adams18 on February 02, 2011, 10:04:12 PM
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I have a Holley 650 Double Pumper on a Professional Products Hurricane intake manifold(3500-8000RPM range) on my 355 with stock heads. .454 lift and 268 duration cam. Is this intake too big?? Thanks
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I've been told that this is just flat out a wrong setup. What do you guys think?
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I don't have much technical data to back up my thoughts on it, but I think if it's for anything short of an all out race machine I'd have to agree that it's not the right setup. A daily driver won't see the rpm range where that intake really shines, so it's not doing you any favors. I would expect more torque and low rpm throttle response from a stock intake, or a simple dual plane like the Edelbrock EPS.
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Dual plane intakes are best for off idle to about 4500 rpm....
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That makes sense. The most I would ever want to turn this engine is 5200. and this intake is a single plane.
Would anyone like to trade a more moderate intake for my polished high rise?? :) :)
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Key word: stock heads
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They're 1.94s with a three angle valve job.. although I may be putting some 2.02 Vortecs on it. Still stock though..
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Look up the specs for rpm range on your intake and cam-they should match up. also if you are going with vortech heads you'll need an intake to match the heads as well.
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What is the number of the casting's of the cylinder heads? Beastie 3 make's a valid point. Is the truck an automatic or stick? Need more info, for a better answer. If the truck is basically stock, axle ratio, no convertor change, headers, free flowing exhaust, etc.. then yes 650 d.p. too big. Dual plane, more low end, single plane more for top end. Your combo might be able to be tweaked, just need more information on your setup.
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I'm going to venture to say, you need to stay with a dual plane intake for that head, cam, and carb set-up. Even upgrading the heads fairly soon, that cam won't make use of that intake. You'll end up with a slug of a motor on the bottom end, which is not what I personally like in a heavy truck. Low to mid-range is where it's at for me. Performer RPM, or even the PP Typhoon, or something of the like will yield you much better, and driveable, results.
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Just a rule of thumb. If you see an intake mainifold with a giant square hole in the center, it's too big to drive on the street and do any good. It's made for flat out racing.
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I would say don't use that intake with that setup.