[William]

Back in the '80s I was involved with a ZL1 restoration project. At the time I corresponded with an Engineer at the Tonawanda engine plant, Fran Preve. In one of the letters I asked that question. He stated ZL1 cam and main bores had to be done on a boring bar-very slow process. Caps were fitted to a block; block and caps stamped with a number. The caps had to be removed for some of the machining process, re-united later. I believe this is no longer necessary with today's cutting tools.

Never met him but Fran was a great guy, passed away several years ago. Always pleasant, promptly responded to my letters. Much of the BB production data came from him.