Which motor is this?

[sixfootman2005 10+ year member]

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

Click to read more...

 

[InhumanAcura 5,000+ posts]

pics...

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

 

[RandyJ 10+ year member]

Where is that number from??

 

[Ignatowski 5,000+ posts]

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 10+ year member]

She's real fine, my 409.

 

[sixfootman2005 10+ year member]

that number was off the intake manifold

 

[RandyJ 10+ year member]

that number was off the intake manifold

Then that will be the casting numebr for the IM. Get the one off of the block //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[marleyskater420 5,000+ posts]

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 5,000+ posts]

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 10+ year member]

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 5,000+ posts]

small block = mousebig 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 5,000+ posts]

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 5,000+ posts]

if it has 6 valve cover bolts it's a big block. 4 = small block

 

[marleyskater420 5,000+ posts]

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 5,000+ posts]

no, its not considered a bb...