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Re: It is complicated - combustion chambers count
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Posted by Mark - IN. on March 27, 2006 at 21:19:28 from (64.12.116.74):
In Reply to: Re: It is complicated - combustion chambers count posted by Tramway Guy on March 27, 2006 at 08:41:36:
Actually, in '71 the 396 was bored .030 over from 4.096" to 4.126" from the factory, hence the 402. Folks used to say had a 400, and others would incorrectly ask "big or small block". Was a small block 400, and a big block 402. Not the same. Wanna really screw someone up? Give him a '68 or earlier big block cam to use in a '69 or later big block. The cams of a '68 or earlier had a large groove on the rear journal, and the bearing had a 1/16" hole for oiling. In '69, that groove went away, and the hole in the bearing was increased to 1/8". So, if use a '68 or earlier cam in a '69 or newer big block and don't solder the oiling hole shut in the rear cam bearing and re-drill at 1/16", can watch the oil pressure drop to zero, and adios amigos to the bearings. I did that to a friend by accident once for his brand spanking newly rebuilt '70 396. He came over and borrowed a cam, I grabbed one out of a box that was perfect in durations and lifts, and forgot and looked right at that groove but didn't think about that groove. I saw him the next day and asked how the race went, and he said must've had a defective oil pump because lost all pressure, and scrapped it. That's when I remembered the groove. I picked that cam up for '66 427 that I hadn't finished. YOUCH! I never did tell him about that, nor did I ask him to pay me for the cam. Mark
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