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Greetings,

 

I have a 6257 DP installed on my CJ7 and about to strap on a Holley 390.  I can’t find any info on which plane is the primary vs secondary. Summit Racing says the smaller ports (bottom, further from the motor) are primary. However, I’m seeing images online of 4 barrels mounted backwards with the primaries on the upper plane. Please help!

 

Thanks,

Matt

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Info on this would be greatly appreciated. Thanks!