Figure even the high revving 302 SBC, ZL-1 BBC both had dual planes from the factory back then. Not sure they had a single plane-unless you consider the factory Chevy and Pontiac cross rams that had a common plenum a "single plane".
Of course now GM and Mopar have factory single planes in their catalogs. Chevy even has a dual carb bolt pattern cast iron dual plane for the class circle track guys that need a cast iron and mounts a Holley in a different postion than a Qjet to center both more evenly-something the aftermarket dual carb patterns do not do.
I always wondered why some dual planes carried the individual carb bore holes down so far in the deep plenum. Our HO/RAIV even had 4 holes-my 409s had 3-one for the shallow plenum and two the deeper plenum. Most of the later Z28 and BBC hi perf did not.
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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
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