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By jimcar-9 - 11 Years Ago
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Ok Guys
I have read all the work Ted has done on all the tri power intakes (thanks Ted!!) but if one is not aiming for high reving hourse power but instead a hooped up stockish 272, where I would like to add a tripower for looks, cool factor, and a few extra ponnies.
Now to the question:
If I want to focus on low rpm torque, Would it be more beneficial to go the offenhauser tricarb intake instead of edelbrock 553 or 753. I was thinking of air/fuel mixture speed from carbs to cylinder?
Would appreciate all the feedback I could get.
II have a few oppenings for offenhauser intakes but non for the 553 and 573.
Would the 553 be more appropriate for low end torque over the 573?
Thanks in advance
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By charliemccraney - 11 Years Ago
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Based on Ted's testing, the Offenhauser is just plain bad for any kind of performance, low end or high end. It might be a hair better than your stock intake, depending on which one you would be swapping from but for the most part, it is a mount for 3x2s so you can get the look and that's about it. If you find one cheap, get it and use it until you find something that is good.
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By The Master Cylinder - 11 Years Ago
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The problem with the Offy is it's a 360° design manifold and the plenum is open to all the ports, not separated like the 180° manifolds. With the Y-Block port configuration the fuel tends to 'pool' in the bottom ports of the 360° design manifold, thus having poor atomization and run richer in those cylinders.
If you can get one cheap enough they look nice... hanging on the garage wall.  |
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By jimcar-9 - 11 Years Ago
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Hmmm its THAT bad.... Well then I know I will keep looking for a edelbrock manifold
What about the 553 or 573 ?? for low end power
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By steinauge - 11 Years Ago
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I am sorry to hear this! Last week a friend gave me an Offy tri power intake and I had figured on using it on the fresh 292 I am building.I remember using them many years ago and they seemed to give more power than the 1x4 setup with a small base WCFB carter or teapot Holley.Of course that was 40 plus years ago and you know what they say about old mens memories.
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By charliemccraney - 11 Years Ago
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Here's a link
http://forums.y-blocksforever.com/Topic40554-1.aspx
If you are going from a single carb intake, then the offy may be an upgrade but it was at the very bottom of the 3x2 intakes tested by a pretty significant amount.
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By The Master Cylinder - 11 Years Ago
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You will notice that all of the other manifolds are of 180° design, you can see the separation of the runners to the upper and lower ports. Only the Offy manifold (lower right) is a 360° where the runners all connect to a central 'log' running down the center. Compare with the size of the runners on the 573 Edelbrock (upper right).
Thanks for the link to the photo Charlie. |
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By PF Arcand - 11 Years Ago
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The 553 Edelbrock likely would work well on a 272. As pointed out, the Offy is an inferior design. However, there are other intakes out there that are better & likely don't command the price that the two Edelbrocks do. Look for an Edmunds, Weiand or Fenton. All except the Fenton were tested by Ted, so the ratings are published.
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By Riz - 11 Years Ago
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I got an NOS Offy 3x2 intake cheap ($110) and have been running it for quite a few years with original holley 94s.
It is superior to the OE single 2bbl.
I didn't pay a lot and it was in NOS condition with no stripped threads, broken studs or booger welded cracks that you see on so many.
I got it with the same intention of finding a decent priced Edelbrock-the prob is a decent priced Edelbrock in good condition has been like finding a unicorn.
I like the additional power and the nostalgia of using original parts-(also have G heads with mild port)
If you want top performance a 60+ year old carb set up that is prone to leaking, boiling and myriad I other tinkering x3 and doesn't like any more than 2PSI is not the answer.
If I ever do find that unicorn-or if Vic ever builds the intake they promoted a few years ago-the carbs and progressive linkage 75% of the time I am putting along on just the primary as the outers have blocked idle circuits and PV.
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