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sixfootman2005
04-11-2006, 09:23 PM
my dad bought a 63 impala on Sunday......we were told it had a 403 big block.....then we realized there is no such thing.....so i'm thinking it could still be a 403(not original of course) the only numbers i can find are "411990" with "D6 CE" right under it....we should have it pulled out this week/weekend....anywhere else i should look for numbers? thanks

i can get pics if you want....oh yea and the impala was in a demo derby:crap: so there's not much good left

InhumanAcura
04-11-2006, 09:49 PM
pics...

im thinking a 396 bored over..if its a rat motor.

RandyJ
04-11-2006, 10:02 PM
Where is that number from??

Ignatowski
04-11-2006, 11:17 PM
409 not 403.....
409 impalas were chevys first BB motor,powerful in its day,lame by todays standards


Like the beachboys song,my lil 409 lalalalala

RandyJ
04-11-2006, 11:41 PM
She's real fine, my 409.


http://img139.imageshack.us/img139/7261/dsc001515vg.jpg

sixfootman2005
04-11-2006, 11:49 PM
that number was off the intake manifold

RandyJ
04-11-2006, 11:52 PM
that number was off the intake manifold

Then that will be the casting numebr for the IM. Get the one off of the block ;)

marleyskater420
04-12-2006, 03:34 PM
Prolly a 396 bored, or the 409, or maybe someone was retarded, and bored a 400 to a 403. Why they would do that, I dont know...

You know, I still dont know what rat motor means exactly...I never quite got that.

InhumanAcura
04-12-2006, 04:49 PM
Prolly a 396 bored, or the 409, or maybe someone was retarded, and bored a 400 to a 403. Why they would do that, I dont know...

You know, I still dont know what rat motor means exactly...I never quite got that.

small block = mouse
big block = rat

400 is a small block iirc..

etznova
04-12-2006, 04:54 PM
im doubting its a 409 there kinda hard to find nowadays and if it was used in a derby i would say a 396

marleyskater420
04-12-2006, 04:57 PM
small block = mouse
big block = rat

400 is a small block iirc..

ahh.

400 is the small block that never could. Its not a BB,and its not a SB, its just there..

Technically, I think you could call it a BB, because pontiac used it to make its BB 455's using the same block.

Slo_Ride
04-12-2006, 05:09 PM
ahh.

400 is the small block that never could. Its not a BB,and its not a SB, its just there..

Technically, I think you could call it a BB, because pontiac used it to make its BB 455's using the same block.

lol, well.... no


quick way to tell if its a 409 is by the valve covers. if they look like an upside down "w", hence the term "w motor", then it is. but if they are rectangular then its definetly not. look behind the drivers side head on the mounting flange for the casting number and i can tell you more

Slo_Ride
04-12-2006, 05:11 PM
if it has 6 valve cover bolts it's a big block. 4 = small block

marleyskater420
04-12-2006, 11:42 PM
lol, well.... no


quick way to tell if its a 409 is by the valve covers. if they look like an upside down "w", hence the term "w motor", then it is. but if they are rectangular then its definetly not. look behind the drivers side head on the mounting flange for the casting number and i can tell you more


No to what?

InhumanAcura
04-12-2006, 11:58 PM
no, its not considered a bb...

marleyskater420
04-13-2006, 04:14 AM
no, its not considered a bb...


reayykky? da,mi thouht so. but imm too ducked fup to really ****

Ignatowski
04-13-2006, 09:21 AM
409's are indeed considered Big Blocks.....The first really,then came the 396's,then 427s the 454s -

400 SBC are awsome when modded with longer rods,better valvetrains and
some compression.... but in GM form they ******,and overheated alot due to the steam hole issue