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Basicly everything, The Chevy 400 is a member of the small block Chevy engine family and has a great deal of parts interchange with 265-350 chevys. (heads, intakes, distributors, water pumps, exhaust manifolds). The small block Chevy 400 has 4.40" bore spacing, a deck height of 9.025 and 2.65" main journals.
The Pontiac 400 is a member of the Pontiac V8 family and has interchangability with Pontiac V8s 287-455. (heads, intakes, waterpumps, distributors, exhaust manifolds). The Pontiac 400 is physically larger with a bore center of 4.62", a deck height of 10.23" and main bearing journals of 3.00".
The two engine families however have almost nothing in common, and almost no parts will interchange. The only thing they do have in common is the both share a 4.12 bore and 3.75 stroke. Pistons, crankshafts, and connecting rods, will NOT interchange due to design parameters. Both engines also require a specific transmission bellhousing since they do not share the same bolt pattern.
What else can I help you with?
How do you tell the difference between a Chevy 400 and a Pontiac 400?
Many ways. Pontiac 400 has a cast aluminum timing cover, that mounts the water pump directly on it, Chevy 400 has a stamped steel timing cover, water pump mounts to the block. Pontic 400 has fuel pump on the drivers side, Chevy is on passenger side. Pontiac has a separate valley cover below the intake manifold, Chevy intake IS the valley cover. Pontiac distributor does not go through the intake manifold, Chevy does. Pontiac has 10 head bolts per side, Chevy has 17. Pontiac has long exhaust ports that bend 90 degrees from the side of the cylinder head, Chevy exhaust ports end at the face of the cylinder head. Pontiac spark plugs are above the exhaust manifolds, Chevy is below. Pontiac 400 is physically larger than the small block Chevy 400 also.
What is the weight difference between a Chevy 454 and a Pontiac 400?
For complete engines, the weight of the average (stock) 400 Pontiac at about 650 lbs. is roughly between the average (stock) Chevy small block at about 575 lbs. and the average (stock) Chevy big block at about 680-685 lbs..
What is the difference between a 350 Chevy crank shaft and a 400 crank shaft?
400 has a longer stroke
Is there a difference in main journal size between the Chevy 350 and 400 engine?
yes
What is the difference in the gm engine 400 and 455?
If you mean the difference between the Pontiac 400 and 455....the differences are the bore size, the crank stroke length, and the main bearing journals. All are bigger on the 455. However, there is also a small block Chevy 400....which has nothing the same as the other two. The Pontiac 400 has a bore of 4.12, stroke 3.75 and 3" main journals. The 455 has a bore of 4.151, stroke of 4.21, and 3.25" main journals.
What is the difference between a 350 Chevy engine and a 400 Chevy engine?
does anyone have a f@#$%^& clue i would apreciate it thank you.............
Will Pontiac 400 manifold fit Chevy 400 engine?
No, I do not think so as they are not the same engine.
Does a Pontiac super turbo 400 transmission have a Chevy bolt pattern?
no
Will a turbo 400 transmission bolt up to a 400 Chevy block?
A Chevy turbo 400 will bolt up to a Chevy 400 engine just fine. A BOP (Buick, Olds, Pontiac) turbo 400 will not bolt up to a Chevy engine. The bellhousing is different between the Chevy turbo 400 case and the BOP turbo 400 case. Another option is a J-W Performance ultrabell which can be used with a Chevy or a Buick, Olds, Pontiac engine, but this requires the transmission case to be modified in order to use it (The original bellhousing must be cut off and the case prepped, then the ultrabell bolts on with the front pump bolts).
Does a Pontiac super turbo 400 trany have a Chevy bolt holes?
No...it will have the bolt pattern of the Pontiac, Cadillac, Olds and Buick. Chevy has a different bolt pattern. There are some transmissions that do have the dual bolt pattern, but I don't think the TH 400 was one of them.
Can a 400 transmission fit 305 engine?
sure, as long as it's a Chevy turbo 400 and not a Buick, Pontiac or olds 400 it will bolt right up.
Will Chevy heads fit Pontiac 400 block?
No, Not even close, Totally different designs.
