318 For Fun

Few more things

1st I assume most people aren’t gonna port or have their heads ported especially to get the best power and velocity for the application. At best maybe a little bowl cleanup and gasket match.

2nd the 318 head was designed for a 273 size engine it has decent flow for a
273 cfm to cid ratio is about the same as a 340, right cam and cr 300 hp possible. The 318 is 45 cid bigger than the 273 and only 22 smaller than a 340 less once over bore.

problem with 318 is cr and head flow
With factory long block 4bbl headers and xe262h cam has dyno 282hp @ 5000 rpm not too bad easy to do. Above that you could squeeze 300 hp with more cam but really should be considering better heads. With the cost of Speedmaster it hard to justify putting money into factory heads.

Speedmaster intake and heads 650/750 carb headers decent cr which leaves cam, put a pretty mild cam like xe250h for easily into the 300 hp very streetable setup to xe285hl and more cr for 400 + hp for street strip car and anything in between.