Why the overbore from 396 to 402 - Page 2

Zman · #11 10-23-2003, 10:45 AM

The "other" one I've heard, is that GM had a batch of flawed blocks, and rather than trash the blocks, they bored them .030 over [img]/ubbthreads/images/graemlins/bs.gif[/img] [img]/ubbthreads/images/graemlins/dunno.gif[/img]

COPOL89 · #12 10-23-2003, 12:02 PM

Joe: The emission delete makes sense, In the engineering department one of there "mottos" was parts not installed have no warranty problems. Also weren't they having problems with the smog pump on some hipo engines over heating the exhaust systems? I could be wrong about the smog pump over heat thing it could have been an isolated thing at the dealership i worked at the time.(or maybe a loophole in the law to remove it) [img]/ubbthreads/images/graemlins/dunno.gif[/img]

resto4u · #13 10-23-2003, 12:44 PM

Gm has done some weird things. They put 400 emblems on trucks that had the BB 402, go figure. [img]/ubbthreads/images/graemlins/dunno.gif[/img]

copo9566aa · #14 10-23-2003, 01:59 PM

Another strange move for GM in 70
GM never put the new 400 SB in a Camaro for what ???
emission or warranty problems or bigger problem with this
new block for 1970 ???
GM like more overbore the 396 to 402 [img]/ubbthreads/images/graemlins/dunno.gif[/img]
Strange move [img]/ubbthreads/images/graemlins/biggthumpup.gif[/img]

COPOL89 · #15 10-23-2003, 02:59 PM

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

[/img]

55chevy · #16 10-23-2003, 05:01 PM

I've seen a few Chevelles that way too. Non-SS cars. I've seen a few 71 402 Heavy Chevy Chevelles with 400 air cleaner decals on the 402. And I've seen a 71 Malibu with a 402 BB that had 400 fender emblems and air cleaner decal.
Probably too many Chiefs going on back then. That's probably why there were so many different things going on at the same time. I'm sure everyones been in that situation. [img]/ubbthreads/images/graemlins/headbang.gif[/img]

camarojoe · #17 10-23-2003, 05:34 PM

I've heard stories about the 71 Heavy Chevy Chevelles, and that depending on what transmission you ordered along with the 400 engine, you would either get a 402 big block or a 400 small block, and both were called "400" on the order sheet... I don't know if that's fact or fiction, but wouldn't it be a bummer if you and your buddy both ordered 400s and he got a big block and you got a small block? [img]/ubbthreads/images/graemlins/blush.gif[/img] That would be my luck! Anyone ever hear of this? [img]/ubbthreads/images/graemlins/dunno.gif[/img]

55chevy · #18 10-23-2003, 05:48 PM

I can't remember ever seeing a 400sb in a Chevelle. Seen plenty of them in Monte's and Full Size but that's not to say a Chevelle never had one. [img]/ubbthreads/images/graemlins/dunno.gif[/img] The 400SB was a fairly mild engine wasn't it?

JoeC · #19 10-23-2003, 07:10 PM

400 Turbo Fire was SB 400 Turbo Jet was BB
I think the "Malibu 400" was a model name

Pantera · #20 10-24-2003, 01:19 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]

Dedicated to the Promotion and Preservation of American Muscle Cars, Dealer built Supercars and COPO cars.