Intkae manifolds

[Don Dulmage <big-d@xxxxxxxxxxxx>]

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Well me i would go with the largest average HP. Lets pretend it was money. Would you rather work for 800 dollars per weeks with one pay at the end of 1200 or work for 900 per week steady. 
Hp is the same. More average HP means the engine does more work. More work means better performance , lower ETs. however on the right type of engine with a high duration roller cam , huge cylinder heads and little need for bottom end power in a light weight car then the new 440 intake would get the nod. 
BTW one of the great things about a perfomer  style intake  or most dual plane intakes is that it solves a little problem with firing oder. 
18436572   57 which are side by side in the engine  drivers side rear corner. fire one right after the other. This places a lot of extra demand on this section of a single plane manifold and that back corner barrel of the carb. You may have noticed the chevy guys now have new cams for their engines that change this firing oder (Chevy normally uses the Chrysler firing order)  and swap cylinders to eliminate this little quirk. We have no such option yet although we have asked for it off and on more than once on the last 10 years or so. However, The dual plane manifold does away with this problem by plumbing 5 and 7 to opposite sides of the intake , something the single plane cant do. Does that make a big difference? It is hard to say but it is something to think about.  The Perfomer RPM manifolds are  the best of both worlds and there was a tremendous amount of work put into especially the 440 one. It is no wonder it works so well. 
Don
Author of
Return to Deutschland (True Adventure)
Old Reliable (Mopar)
http://stores.ebay.ca/Don-Dulmage-Enterprises
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