Re: It is complicated - combustion chambers count

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

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]