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Identifying 400 vs 350 in '79 Jimmy?
- Thread starter wy4tt
- Start date
SUBFAN
1/2 ton status
Best check the numbers....
Second pull the inspection cover and look at the flexplate. Is there a weight welded onto it with drill marks in it for balance?
Three freeze plugs = 400, although not all 400's have them....
Second pull the inspection cover and look at the flexplate. Is there a weight welded onto it with drill marks in it for balance?
Three freeze plugs = 400, although not all 400's have them....
supersize75k5
OrganDonorRacing.com
well I can give you a pic of a t-350 I had loaded
if you want a good reference, go to your local performance shop and look at the tranny pans so you can learn the difference,
or look on jet's website, they have some decent pics
if you want a good reference, go to your local performance shop and look at the tranny pans so you can learn the difference,
or look on jet's website, they have some decent pics
supersize75k5
OrganDonorRacing.com
t-400 pan
supersize75k5
OrganDonorRacing.com
t-350 pan
Are you talking about engines or transmissions?
They mentioned stuff about both, I'll add some info about engines.
- some 400s have 3 freeze plugs, some don't.
- the engines that don't may or may not have a boss for a 3rd freeze plug that is not drilled.
- it may have "509" casted in the middle where the freeze plug would be if there isn't any boss casted in
- all 400s have a large round radius sticking out the side of the block on the #1 cylinder because the bore is larger, you can feel it with your hand
- the balancer on a 400 has material removed around part of the outer edge because it it externally balanced from the factory.
- if the heads are off 400s have 2 small steam holes between all of the cylinders that other SBCs don't have.
Good luck man.
They mentioned stuff about both, I'll add some info about engines.
- some 400s have 3 freeze plugs, some don't.
- the engines that don't may or may not have a boss for a 3rd freeze plug that is not drilled.
- it may have "509" casted in the middle where the freeze plug would be if there isn't any boss casted in
- all 400s have a large round radius sticking out the side of the block on the #1 cylinder because the bore is larger, you can feel it with your hand
- the balancer on a 400 has material removed around part of the outer edge because it it externally balanced from the factory.
- if the heads are off 400s have 2 small steam holes between all of the cylinders that other SBCs don't have.
Good luck man.
