[U47]

From mac's Motor City garage.
M/T project from circa 1962 featuring a twin-supercharged Pontiac V8 with an unusual breathing arrangement, to say the least: The intake and exhaust ports are on the same side of the cylinder heads. But there was actually some method to the madness, as we will see.
A pair of GMC blowers mounted outboard and driven by Gilmer belts. This seems to be somewhere in the mockup phase, and the cylinder heads definitely appear to be new aluminum castings rather than modified Pontiac production pieces. Note: There’s an extra cylinder head on the floor at lower left in the photo that can give us a clue as to what this engine is all about.
This detail enlargement provides*a better look at the M/T cylinder head arrangement. We can see that yes, the intake passages have been rotated 180 degrees so now they are on the same side of the head as the exhaust ports.
While it seems counterintuitive to jam the intake and exhaust ports together on the same side of the head in this manner, evidently there was some sensible logic behind it. By flipping the intake ports around to the “back side” of the head, now they no longer had to snake around the pushrods and the top, inside row of long head bolts. The intake ports could now be shorter and straighter with minimum resistance to airflow. In theory, anyway.
There was also a naturally aspirated version of M/T’s contrary V8 using a pair of Carter AFB four-barrel carburetors. Since the conventional V8’s cylinder firing sequence would create some carburetion problems with this arrangement, it’s possible that a 180-degree crankshaft, aka flat crank, was used. This would transform the Pontiac V8 into two separate-but-equal inline four-cylinder engines on a common crankshaft.
click on the links below;
https://i0.wp.com/macsmotorcitygarag...pg?w=576&ssl=1

https://i1.wp.com/macsmotorcitygarag...pg?w=399&ssl=1

https://i2.wp.com/macsmotorcitygarag...pg?w=570&ssl=1