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an Offenhauser 5186 dual quad intake. Just curious if this would be enough intake for my combo but the cool factor would be way up with dual quads and I could do it pretty cheap. Opinions?

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I have an opportunity to get an Offenhauser 5186 dual quad intake pretty cheap. I am contemplating putting it on my 451 stroker motor with stock 451 heads (2.02/1.81 Roller rocker) Just curious if this would be enough intake for my combo or if anyone has experience with it. I was figuring on going with an Eddy RPM but the cool factor would be way up with dual quads and I could do it pretty cheap.

Opinions?

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It is a single plane. I will run the 273/318 unit on a future 360 build. The consensus (facts) are that a Performer RPM and a Holley carb will perform better and make more power. Myself (like you) am choosing the cool factor over best performing set up. The best underhood dual quad manifolds are the Edelbrocks but they never made one for the low deck.

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Greg,

The heads were off a 440 race engine that a high school shop class built. I think the whole thing ran on the dyno for about 10 minutes before the bottom end on the thing went "BOOM!" I am the benefactor... I think the valves are okay. Oh, Sorry on the typo. Intake 2.14

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Already knew what you mean't on the intake valve.

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I have had good luck with the Edlebrock 2x4 intake and carbs on friends project cars, and they definitely increase the "wow" factor when the hood is opened.

I found one a little rarer - a Weiand Max Wedge port 2x4 low rise intake. I think it was from around 1964-65.





Thinking of modifying it to use on my twin turbo EFI motor.

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I have had good luck with the Edlebrock 2x4 intake and carbs on friends project cars, and they definitely increase the "wow" factor when the hood is opened.

I found one a little rarer - a Weiand Max Wedge port 2x4 low rise intake. I think it was from around 1964-65.





Thinking of modifying it to use on my twin turbo EFI motor.

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I found Dave Frieburger's hotrod magazine 383 intake manifold shootout. Thank you Dave! If that guy weren't working for hotrod, that article would have never been in print. The engine was a mildly built 383. The Offy 360 dual quad intake didn't blow wind up anyone's skirt but didn't do poorly either. The interesting thing was that while the Eddy RPM did about the best overall on that engine, some of the low profile single planes numbers were just as good. We're talking Eddy Torker, Holley Street Dominator, Mopar M1 and even the old Eddy T6 Tarantula. Only difference being the RPM does better down low and the single planes had it up high. Given what I want to build, I think the performance of the would fall off a bit compared to the others.

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The Offy manifolds were really misrepresented in that shootout, they had no jets/metering rods to properly calibrate the carbs. The offy tests were in the 10.9:1 a/f ratio range

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I found Dave Frieburger's hotrod magazine 383 intake manifold shootout. Thank you Dave! If that guy weren't working for hotrod, that article would have never been in print. The engine was a mildly built 383. The Offy 360 dual quad intake didn't blow wind up anyone's skirt but didn't do poorly either. The interesting thing was that while the Eddy RPM did about the best overall on that engine, some of the low profile single planes numbers were just as good. We're talking Eddy Torker, Holley Street Dominator, Mopar M1 and even the old Eddy T6 Tarantula. Only difference being the RPM does better down low and the single planes had it up high. Given what I want to build, I think the performance of the would fall off a bit compared to the others.

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The Offy manifolds were really misrepresented in that shootout, they had no jets/metering rods to properly calibrate the carbs. The offy tests were in the 10.9:1 a/f ratio range

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Offy manifolds are definitely UNDERATED! They do make good power in multiples, but todays technology
kinda tossed undeserving eggs in their faces. The best thing about these manifolds is the flow numbers - they stay close to when it was new. Meaning there is little fuel distribution problems within the manifolds. Some of their manifolds DO need modifications, maybe cause of engine (combination of parts mismatch) design or application ie: street/strip, cruising, all out bracket.