Don Terrill’s Speed-Talk

Likely 95% street use. 4.100" bore 3.228" stroke + 43" per cyl. Target is 65+ hp. per cyl. Hp max should be 7K + rpm. with good torque band.
Air cooled iron cylinders and aluminum liquid cooled head,( pair of cyls). I prefer reverse-flow coolant. What size(1) coolant port on exh. side ? Exh. is on bottom,
so air entrapment not likely. (2) exit, top) on intake side. Sizing between In/out ?
Thoughts ? Thanks, Art.

Nobody ?

Porsche 956's had air cooled cylinders with water cooled heads. 962's were completely water cooled, but the heads are similar. Since the heads were individual castings, a coolant manifold connected everything.

Looking at the google images can give you an idea of the size of the water inlet and outlet. HP was approx 100hp/cyl for reference. FWIW

Will do. Thanks.