'57 Factory Dual Quad Intake Question


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By slumlord444 - 14 Years Ago
I am planing on replacing the ECG heads on my 312 with the Mummert Aluminium heads and a Mummert cam that is a little better than the Crane SS300B that I have now. There is a question weither the factory intake and dual quads provide enough flow for maximum horsepower. The intake is currently port matched to the intake gasket and the heads are also port matched to the intake gasket. Any other mods I may need to do to the intake. As I recall the stock teapots flow around 350 cfm each which makes 700 cfm total. I am thinking this is on the high side rather than being too little. I realize that the Mumert intake and a 600 to 700 cfm single 4 barrel MAY be better but I have been running the factory setup since '65 and I have always been satisfied with the peformance. Love the stock look also. Would I be advised to port match the Mummert heads to the intake gasket also? I am a little leary on just gringing away on a $2200 set of heads.
By Ted - 14 Years Ago

Don’t be afraid to grind on the heads to port match them to the intake gasket.  If you’ve never ground on aluminum before, you’re in for a surprise as they cut very easily.  Just keep the pressure on the burr that’s being used light.  Don’t use stones.  Also having some brake fluid handy to dip the burr into will keep the burr nice and clean.  And be sure that the heads are fully disassembled so that they can be cleaned up thoroughly after the grinding takes place.

 

As far as the dual quad setup goes, here’s a past link where the factory ’57 2X4 setup was dyno tested bolted atop the aluminum heads.

http://www.y-blocksforever.com/forums/Topic46008-11-1.aspx

By slumlord444 - 14 Years Ago
Thanks for the reference. Had looked at it when it was first posted but that was last year. Just recently decided to go for the aluminium heads. I am familiar with working on the aluminum after port matching the dual quad manifold. Trick it to go slowly so you don't take out more than you want to. I am curious to see how much better it runs with the heads and a better cam. Got into the high 14's with the dual quads on a .30 over 312 with stock ECG heads and the Crane cam. 3 speed allsyncro trans and 3.89 rear end. Was launching it at 5500 with 6" recap cheater slicks and shifting at 6500. I am thinking it had to have close to 300 horsepower to do that with a 3600 pound car.