273 or NOT 273?

We are building a 273 12-1 engine right now for an original 273 HP. customers car. Pistons are available through egge Egge Machinery Company | Pistons Mfg | Water Pump Mfg we bought a set of .040 over.

273's cost a little more to make Horse power due to small valve heads. If you want to use big valve heads the bores will have to be notched for the valves. . 273 forged cranks do not have the journals drilled due to the light duty rods. Use a 318 if you can't find a 340 block near you. Less machine work and more cubes right from the start. It will rev to any RPM you build it for.