I was holding off to reply to this.
First, does anyone have a copy of Hot Rod magazine (it may of been another magazine from that period) of an article that may of been written by Don Francisco on a Y-block build up and dyno test doen by Edelbrock from around 1956, or there abouts? I seem to recall others, particularily Jerry Christenson, referencing it in his YBM column. If so, I would like to obtain a copy or scan of it to read.
Second, Oldmics and I have been collaborating our research regarding the 1956/57 factory 312 High Performance engines, particularily camshafts, trying to verify the stories about the Isky E2, S/C cams, and the various high performance kits released by Ford and Mercury. Oldmics recently interviewed Ed Iskenderian, and the info he shared is quite a revelation. Not to steal Oldmics "find", I'll wait a while to allow him to post his info. However, Oldmics wasn't concerned how the info got out, as opposed to finding all of the answers. So hopefully he will chime in.
And yes, Isky also told the inner valve spring story to Oldmics.
Regards,
Dennis