1978 318 heads? Small port? Or large

1978 offered a 4bbl 318 for California. Do not know if they had large port or small port. Check your cylinder head casting number under the valve cover and then it can be for sure.

All 2bbl 318s had small port heads from '67 to '89. At least some 4bbl motors had 360 heads- same cast #s and all, '84 was the last year for civ cars/trucks/vans to get it, cop cars also had them from '85-'89. For some stupid reason they quit offering the 4bbl on civvy models after the 302 head came out and the pistons changed to up CR, which would've made the 4bbls motors much nicer. '85-91 318s are 302 heads/equivalents unless a 4bbl motor. Magnums are the same 318/360 in ports and valves but may have different cast numbers oddly.

The small port heads are a good weight bare for use as an anchor if you've got a nice sized boat.