Single or dual quad 427 s/o?

[elmariachi]

Originally Posted by FUNFER2

Jim- do you think the original 2x4 intake made the difference or the correct carbs ? What carbs are they ?

Kevin, that's a great question. I am sure naysayers will say the performance increase was because the 4-barrels I had tried were tuned all wrong but I even had Keith Craft's guys dyno tune a Holley 3255-1 LeMans and the 2x4s were a vast improvement over it.

I bought a set of original BC/BDs, list 3300 and 3301 that had been restored/rebuilt. I literally took them apart to notate jets and PVs, bolted them back together and slapped the whole assembly on. I came back after an initial weekend of running, reset the float levels and decreased primary jet size to 66 from 68 and that's been all I have done.

The MR intake seems to sit a tad tale than the Sidewinder, which probably helps and having a package of carbs and intake that were factory tested and matched must count for something. For what its worth, about the highest vacuum reading I could ever get on the Sidewinder was about 6.5" Hg. I even changed intake gaskets to be sure, still no change. On this intake I am getting 9" Hg at idle.

I have not yet had the car on a chassis dyno but I plan to this winter. If nothing gets any better I am a happy camper.