Late 80's swirl port heads 302/714's

As with virtually everything hot rod related...... whether or not fooling with 714/302 heads makes sense for you really depends on what you’re building and what you’re trying to do with the motor/car.

Shortly after MP was hyping up the use of those heads I was commissioned to build/revamp a couple of oval track motors.
318’s with 2bbl carbs, stock intakes, solid cams, headers, 10:1cr.
You could use pretty much any stock heads, valve size rule for mopars was 1.88/1.50.

They were mid-pack guys when I got the motors.
One already had the closed chamber heads, the other had regular open chamber 318 heads. They had 1.78/1.50 valves in both.
The front runner cars would turn close to 7k on the faster tracks.
I felt 360 heads would make more power, but knew a test was needed to be sure.
I recut the intake seats on the closed chamber heads to accept 1.88 valves and did a bowl cut.
On the 360 heads I installed ex seats to fit the 1.50 valves.
Both heads milled to achieve 10:1.

Swapped heads on the dyno...... 596 360 heads were over 30hp more peak hp for that application.
At the very top of the power band the power difference was even more.

They won a series championship that year....... and got teched/inspected waaay more than any other team.

If you’re trying to make decent power, and will be running fairly healthy cam and are willing to turn some rpm..... use 360 heads.

If it’s a mild street 318 based build, in the 1hp/ci or less range..... use whatever is cheaper.