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Old 08-03-2013, 11:58 AM   #1
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offenhauser intake not dual plane?

Ok so I got a brand new offy intake from a guy on Craigslist casting #6257 and that's it no dp or anything else on the end. From what I can see on the internet the only offy intake with that number is dual plane. I was planning on running a 390 holley but since it is open should I change the cfm? Has any one even used a offy intake without the dual plane feature?

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Old 08-03-2013, 03:53 PM   #2
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I run the offy single plane with a 390cfm holley, runs great, you'll love it!

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Old 08-03-2013, 04:30 PM   #3
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Sweet thanks roadyrob got a little worried when I could not find any info on it.
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Old 08-03-2013, 05:56 PM   #4
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they claim the dual plane has more power at low RPM, the single plane more at higher RPM's but my EMPI carb was so screwed up I gained everywhere. I tried a old 450cfm holley first, it ran good but not perfect. found a deal on the 390 model# 8007 and it is perfect. picked up some more power by replacing my old cat and muffler with a 2 1/2" hy-flow cat and XL muffler from magnaflow.
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Old 08-03-2013, 06:16 PM   #5
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Awesome I'm just tired of trying to keep the stock carb running decent. I already have the exhaust opened up just have to find a good deal on a carb. scored the intake for 100. But from what I have read 390 is where its at. And what I will try and find.
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Old 08-04-2013, 09:27 AM   #6
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I went to an Offy intake and a multitude of carbs...MC 2150, Edelbrock 600, Holley 450, And various others including a Predator. Luckily for me I have a workbench full of them from my stock car, But the best carb for a 4.2L hands down is the Holley 390. It is matched well with the low end motor, as well as still having enough left to perform well in the higher RPM's. The Holley 450 wasn't bad, but just a little too much carb for what the motor can handle. Get a 390, you won't regret it.

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