Mopar 383 Connecting Rods

[HP HUNTER]

Originally Posted by Larry Hill

I know I would enjoy the exchange of ideas, and I will learn something that will help my racing program.

My checkered past.
Paul Tune, my teacher and supervisor, and I built and raced a .34 cu. in. glow engines by de-boreing an O.S. Max .40 cu. in. rear rotor engine. So we made tool steel heat treated liners, pistons (.737 dia.), wrist pins (.188 dia.), pin locks (.018 dia.), dykes rings (.020 thickness land pined in place) and heads. It was making the fixtures and tooling that would yield the desired results with repeat-ability that was the biggest challenge. The most difficult operation was drilling a .031 hole, for the roll pin to pin ring, in a .021 ring land without hitting ring land on piston.
We got to play with grit size, cross hatch angle, taper, truing sleeves, cutting pressure, and holding fixtures. Tune built the adapter for the AG 300 so we could check taper in the liner from top to bottom.
A lot of fun and a lot of work. We tried for perfect every time. We said it many times "Big holes big problems, little holes bigger problems"

We would run as high 70% nitro in the engines. 70% was tops because the other 30% was a mixture of oil, alcohol, and CH3CHCH2O . Dr. Hill, no relation, would be so proud if I only knew how make the numbers small for the chemical notation. When we wanted to go fast clear laboratory grade nitro, no dye, was used.

Well it would make sense your knowledge of the Sunnen hone. Precision honing is absolutely critical to the glow plug engine. Over the years as Cox manufacturing was sold to various conglomerates, maintaining the honing precision was a constant problem eventually leading to the demise of Cox.
I'am a BIG fan of Roy Cox.