Tim, the block doesn't have a serial number which is consistent with some replacement blocks. It had an 850 head which I gave away because I will be using an 848 head with the six steam holes added. I forget the block casting date, but it decoded as January, 1964.
Yes, the full flow fittings are 1/2" NPT. The engine had been set up for bypass. The 1/2" bypass feed (oil gauge) had a 1/2"NPT to 1/8"NPT reducer bushing.
The original color of everything on the engine (except for the block) was yellow underneath several layers of Chevy orange. I think the old cement truck had a tough life. The layers of paint indicated several rebuilds and even the non-original block had been bored .060 over and was worn enough that I had to have it bored .080 over.
Matt
