Hi all, I am toying around the idea of getting a dual quad manifold setup for my 65 skylark, I am running a 64 401 not real sure it has a cam in it so I can only assume it is stock, currently running a 750 carter Would a stock set-up be too much CFM for it? I was also debating as the car is not a show car or correct in most regards would I be better off going the aftermarket manifold and carb route as most stockers seem to be on the pricey side for buying a set of rebuildable carbs If I do go aftermarket which would Eelco be best for a fairly stock engine and if so what carb size would be best Thanks for any pointers and if someone has a manifold set-up they would like to part with or come across a lead please send it my way Thanks again, Jim jmos4@netzero.net
First things first, what are you trying to accomplish? If keeping stock bottom end and cam, which is perfectly fine. The cam in an oringinal 425/401 were almost identical for a 4bbl. or dual quad setup. The diffence was in the timing aka. the distributor was setup with more curve I believe. I know someone else will chime in on that. The Offenhauser dual quad is the worse flowing of the manifolds. And just as a note, nailhead engines love lots of CFM's. Running 2- 750's on a dual quad is quite comfortable, except for the fuel bill. Others will further this discussion for you. Don
I run 2 600 on mine but I have a nice size cam too. the 2 4 cam had alittle more lift than the single 4bbl cam. so if your not gonna change the cam I'd go wit small carbs.
Eelco is better than stock i run it with 2 600cfm. you will lose some bottom end but will pull more mid and upper rpms. 750cfm will hurt low end even more.
I am wondering what the stock size for carbs on the 66 Riviera are. I am running a 700 Holley double pumper on mine and it seems too small. What are the stock cfm ratings on the q-jet for this year? I'm assuming that the dual quad setup from the factory was two 600's?
i was running an air cleaner like wkillgs on my eelco but a 1/2 inch higher had to machine the intake 1/4 inch for the hood. then i put a scoop on and sealed it . then ran two 6.25x3.25 air cleaners had to lean the carbs which is funny with fresh air it should make it richer if anything. went to a dyno shop first run with air cleaners than one run with out picked up 17hp and 20 pounds of torque. kn filters said one round or oval is better than 2 little ones that sit so close together. something to think about.
Hi Guys, Marty here. If you think you will have a hood clearance issue; let me know. I do offer the EB62 1/2 shorter.
