273 power? HOW?

the 66 to 69 273 used same size intake bolts as 318/340/360/, 3/8 and same angle. the 64-65 273 had 5/16 intake bolts and different angle. a 360 intake and exhaust sst valves can be cut down to 1.84 and 1.56, this will help airflow and doesn't shroud the chamber walls. the port velocity remains high.
the 2 bbl motor piston has a deck hgt of -.011 with a .028 gasket and 273 head at 57.3 cc, comp ratio can be 9.77. there is a few 2 bbl 273 in stock eliminator, T/S 65 plymouth runs 13.30,s a 235/273 valient in I/SA runs 12,30.s, its a great little motor,