Why the overbore from 396 to 402

COPOL89 · #1 10-23-2003, 03:59 PM

Its funny you mention the truck emblems, My 72 Cheyenne is a 402 with the 400 badges. [img]/ubbthreads/images/graemlins/

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Pantera · #2 10-24-2003, 02:19 AM

I will have to check it out later but I have a 72 super Cheyenne that has a 402 emblem on it. [img]/ubbthreads/images/graemlins/dunno.gif[/img]

JTH74 · #3 10-24-2003, 02:42 AM

I think that Jerry McNeish said in his book that some of the late 69 SS396 Camaros were actually 402's, I will have to go back and read that chapter again just to make sure, I remember him saying that the block casting #'s changed.

Chevy454 · #4 10-24-2003, 02:52 AM

On the same note, some head changes were made along the way in '69 as well. I found this out by accident, as I bought a set of 840s that had never had valves or seats put in them, but were made for the 1.88 exhuast valve, and tapered plug. On the shelf we had a set of 840s that originally had the 1.72 with flat seat plug...the interesting part is they were cast in the SAME WEEK (in May sometime). So, I had the last of the old style with specs of the new style, just by luck. I called MacNeish and Colvin and they said that was correct, that they did a changeover in May sometime to get ready for the upcoming year, and my 840s were kind of a mix between the old 840s and the new 291s. Some cars ended up with 291 heads on them, and it's probably safe to say some got "funky" 840s like the ones I have.

Some wierd stuff took place back in the day... [img]/ubbthreads/images/graemlins/smirk.gif[/img]

JoeC · #5 10-24-2003, 03:05 AM

some late 69 Chevelles have the 402

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