Milage wise, I have driven 19mpg with a 750cfm edelbrock in a Electra 65' only with recurved dist, all in at ~2200 rpm at 65mph.. Improvement over the tired stock carb.. I normally use octane 95..
My vote would be duals as my 401 ran much better with them (stock 625cfms) vs the 750 Eldelbrock, not to mention the visual appeal Regards
I'm still trying to figure out which carb I currently have. I've read about Carter AFB and Rochester. What was stock on 1966 425 nailhead? How can I tell for sure?
According to Wkillgs it was standard to have a Rochester Q-jet on the 425 in 1966 only. Anything else got the Carter. Not sure if the old 4GC was made anymore in 1966, so the Q-jet might be the only Rochester carb offered in 1966.
Anyone need a QuickFuel 650 BAN? I have spent so much money on carburetors. This is the first one of these that says go ahead and do blow through.
Just got through playing all summer with a 401 in a 32 street rod all summer. Car weighs about 2400 pounds and has a healthy cam. Spent most of the summer trying to get the Buick 2 four setup to work. Never did. Switched to a brand new QuickFuel 600 street carb. All sorts of problems with that too. Pulled a 1969 Holley off of COPO 427 Cheby. That is an 850. Never even looked at the jets. Fired right up. Idled better than ever. Made minor jet change and never ran better. Car came alive, idled and cruised great. Then get the Holley hit at WOT! Buicks love big carbs.
Quick question from a V8 Newbie; I've seen the term "square bore" referenced a couple of times. I have a 1966 Riviera with a 425 Nailhead and 4 bbl Carter carb. How do I determine if I have a square bore or not? And what is that term in reference to, intake manifold opening shape?
msthing66: yours is a squarebore as are all Carters of that vintage. Squarebore carbs/manifolds have 4 ports that are about the same diameter and the carb's primaries and secondaries are about the same size. A spreadbore has smaller primaries and much larger secondaries, generally.:Smarty:
