318 low budget heads change

Correct 67 Dart 273

The 1972 318 has a Compression-Rating of {9.23 - 1}, and that is with
the Piston set at below deck -.056",,,,,,, and a .036" Thickness Head gasket.

Of course, we know that it is nowhere near that Ratio,,,,, out of the Factory.

And the 1972 318 Heads {Stock} are 'Open-Chamber' with CC's in the 68 Range.

Those 360 Cylinder Heads {73 CC Chamber's @ Stock} will just devour the
Compression Ratio level, though they do offer a nice Flow with the right Camshaft.