Has anyone here ever dyno the 62 375 hp 390 to see what it really made pretty funny that with a shorter stroke and smaller bore also smaller valves that engine made the same as a 428CJ really did
Just s thought
That's a dyno test I'd like to see too but never have.
Based on other dyno tests of the parts though, how the cars ran, and the Gonkulator, here is what I come up with:
455 T@ 3400 370 P@ 5200 390/375 HiPo
476 T@ 3200 380 P@ 5000 428/335 CJ
The 390 is down 38 cubes (actually 37) but has a bigger solid cam, higher compression, a better chamber, way better exhaust iron, BUT smaller valves, a worse intake, and a smaller carb.
All that stuff offsets each other so inch-for-inch the 390HP wins, but still loses out a little due to the 428CJ extra inches.
That's the best I can describe it.
Of course a PROPER shootout of all the old iron would be fun, but whenever the magazines do it a lot of revisionist history results.