I'm building a 496 and have these heads-6272292, oval port, 2.06/1.72, I'm trying to keep it mid to low budget- can I get new valves and have the heads milled larger? I have a friend in a machine shop that will do it cheap. What size valves do I want for a moderate cam-say like 250 to 270? Is that considered moderate? Should I go larger? It is still a 496.... but will be almost entirely street. I got this car for 100 bucks and block and heads for 300 so now the expensive stuff comes, I know.
Does anyone know about these Dart heads for my 496? I want to run pump gas, and drive in the street 99% of the time. But I want gobs of mid to high end torque to like 6500RPM. I don't think low end will be a problem with a 496.
Chevrolet: 396-454, 119cc combustion chamber, 345cc intake runner, 2.30 in./1.88 in. diameter intake/exhaust valves, 1.625 in. diameter double valve springs, angled spark plugs, assembled, 23 degree, aluminum, Pro 1 head
Or these Brodix, they seem like a good deal;
This Dart intake is actually made for my tall deck and I can get one used cheap; it has rectangular ports and is named BBC.
but this is good and cheap, I just need the spacers; Edelbrocks;
Chevrolet: 396-502, oval port, idle to 5,200 rpm, Street Dominator intake manifold
This intake manifold fits carb flanges 4150/4160. It features low to mid-range powerband, horsepower peaks at 5,200 rpm, oval port heads, and no EGR provision.
This Performer intake manifold for Big Block Chevy is a dual-plane, low-rise intake with a 180 degree firing order and patented runner design that you won't find in competitor brands. This design provides torque over a wide rpm range, especially off-idle through mid-range. It also provides improved throttle response over a stock manifold. It's 50 state legal when installed on 396, 402, 427, and 454 with an OEM carburetor.; 1965-72(1973 non CA) passenger cars and 1966-83 trucks; except stock equipped EGR.
Any suggestions would be greatly appreciated, and the cam would be matched to these parts of course.
Last edited by Slowass72 on 01-20-200