318 4 bbl intake..??

Locomotion said
Unfortunately, there is no "right" 318 4bbl intake because 318's didn't get a 4bbl intake from the factory until somewhere around 1980. Most, if not all OEM small block 4bbl intakes will have ports a little bigger than a 318 head. Will hurt air flow a bit, but it's been done before. Not sure if that continued through the end of carburated 318's. Later 360 heads do not have a letter designation, so you have to find the casting number either on a port under the valve cover or on the underside of the head under the intake. Thermoquads began being used on small blocks in 1972 and I believe at some point, in the '80's, they actually used a Quadrajet.

Just to refine some of your info.....First year for an LA318 to get a 4bbl was 1978. Poly 318's had them much earlier....they even had dual quads! The Thermoquad first appeared on the '71 340 engine. I'm a believer in getting manifold and head ports to match, so, I would recommend getting the head casting number to see what you have, and then get an intake with ports to match. Dual planes are generally better for low end torque and street applications, but, a lot will have to do with how the engine and rear axle were built ........I.E. cam specs, compression ratio, rear end gears, etc.