Here are a pair of induction setups for the poly engine. One mounts a pair of Carter WCFB
The factory four-barrel intake was available through 1962 on the poly 318, while the dual-quad version had a shorter run through 1958. These factory intakes fit all '56-'66 Poly 318 engines, though note that the earliest '56-'57 model intakes used the WCFB (Will Carter Four-Barrel) carburetors with their small-pattern mounting flange. Today, these carbs are less plentiful and a bit pricey, especially for the numbers-matching crowd. A better bet is to find a version which mounts the popular Carter AFB (Aluminum Four-Barrel) carbs, the '58-and-later intakes.
There are also some rare and ultracool street induction setups still passing from hot-rodder to hot-rodder if you know where to look. At one time, Edelbrock built a dual-plane, three-deuce aluminum intake (PN P600) that used Stromberg and early Holley carbs. Edelbrock also made a limited number of finned aluminum valve covers to complement its triple-threat intake. Weiand produced an aluminum dual-quad intake (PN WPD 4 D) for the weight-watchers crowd as well as the single-plane four-barrel (PN 7503) and the dual-plane four-barrel intakes (PN 7508). Offenhauser was reputed to have been in the game as well with a single four-barrel aluminum intake.
If scouring swap meets and garage sales for these OEM and rare aftermarket intakes and carbs don't thrill you, take heart, because new Weiand aluminum four-barrel intakes (PN 7503) are readily available for the Poly 318. Moreover, Edelbrock, through its Carter arm, is still serving up the popular 500-cfm carb for dual-quad applications and the 600-cfm and larger carbs on single four intakes. Need to hook it up? Slick, high-tech progressive linkage waits on Edelbrock's shelf for the dual-quad enthusiast (PN 7094). Still want more? Dick Landy Industries even offers a Holley Powercharger 174 mini-Roots supercharger complete with the blower, the intake manifold, and all the necessary hardware for the Poly motor.
Of course, what goes in must come out, and the factory exhaust manifolds could really use some upgrading. Three options exist for this. The easiest way is to buy a set of headers from Spitfire's Harold Johnson, who has them available for various applications. The second is to have a shop fabricate a set of custom tubes for you. The third, and most adventurous, is to buy a Mopar poly-header flange and tubing kit, and do it yourself. Regardless, headers and a good exhaust system go a long way in making more power with your poly. Boat anchor? Imagine lifting the hood on your outwardly docile, hubcap-clad, Coronet or Belvedere to reveal that Weiand/AFB or dual-quad poly-head engine lurking beneath. Before the Brand-X competition cries foul, just let them know it's not a transplanted big-block torque monster that just blew their doors off, but a small-block poly 318 that is indeed native to those fenderwells. Ahhh, the victory is sweeter when you look like a sleeper but can smoke 'em at will! The poly motor in proper tune and attire can indeed run both hard and fast.-GP
P.O. Box 5094
Dick Landy Industries
19743 Bahama St.
2700 California St.
P.O. Box 416
Holley Performance Products Inc.
P.O. Box 10360
1801 Russellville Rd.
2823 Hwy. 348