Testing the 273 on the dyno....

The Poly 318 2 bbl certainly made 230 hp. And with just 9:1 CR.
They were sold here for many years in Dodges & Plymouths & judging by the performance figures from road tests, they might have been under rated at 230 hp.
It's all in the heads! LOL

poly-318-valve-train.jpg