273 Questions/Help

If you're using the '64-6 exhaust manifolds, you would need to do some modifications to use the 302 casting (or any later 318 smog heads) to keep from breaking the driver's side manifold. Best done by spacing out the manifold enough rather than grinding metal off the head for clearance. You might break into a water passage. You will lose a bit of compression using any of the later open chamber heads too. If your 315 casting heads are in good shape, I think I'd just keep using them until you need to do a complete rebuild. If you're set on installing a 4bbl intake, I'd find a pair of 920 heads (which match the 315's compression ratio-wise) that will accept the later style intakes. You will have many more options for intakes that way. Then you get to figure out what to do with your kickdown linkage :lol: