Interesting engine! It bears a strong resemblance to the small block Chevy, with just a bit of Buick/Oldsmobile influence in there. The bore/stroke combination is a close match to the Z-28 Camaro 302, which had a 4" bore and a 3" stroke. That one was actually developed by American hotrodders back in the late 1950's by boring the 283 engine to 4", (from 3 7/8") resulting in a gain of 18 cubic inches to 301.4 cubes. Chevy cheated half a cubic inch and called the 1967-69 Z-28 engine a 302. It spins along quite happily at 8,000 RPM, given the proper camshaft, carburetion, and valve springs. One of my major competitors on the dirt tracks in California built nothing but 302 engines, and outran those of us with 327's and 350's on a pretty regular basis.
With a roller camshaft, a rev kit to keep the lifters on the cam, and valve springs strong enough to to prevent valve float, those short-stroke engines sound like a bumblebee on steroids! At those extreme RPM ranges, it's also a good idea to run a magneto instead of a battery-powered ignition system.
Jerry
