Chevy BBC 454 Rect Port MidAir Intake Manifold, Fuel Rails & 1200 Cfm Throttle Body but both factors can be

but both factors can be equally important in a race car

Fits big block Chevy rectangular port cylinder heads on standard deck blocks

These combinations start with a reliable Speedmaster 9

they also provide your engine with cleaner air for better performance

1966-72 (1973 non-CA) passenger cars

Chevy BBC 454 Rect Port MidAir Intake Manifold, Fuel Rails & 1200 Cfm Throttle Body but both factors can beThese MidAir Series Manifolds includes a 4150 Series 1200 CFM Billet Throttle Body. Our dual plane big block manifold is now available with rectangular ports, Dual distributor hold downs and Four corner water ports. Fits big block Chevy rectangular port cylinder heads on standard deck blocks.