no
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.
No, I do not think so as they are not the same engine.
No.
45, for an iron intake, 35 for aluminum.
under the intake manifold.
No.
I believe it is under the intake manifold.
An intake from a Pontiac 400 will fit a 389 as long as the engine, or more specifically, the heads are from model year 1965 or 1966.
UNFORTUNATELY IT IS UNDER THE UPPER INTAKE MANIFOLD
I believe edelbrock makes a selection of intake manifolds for the 4.9. I have a carb 4.9 in an 81, I'm thinking of getting one.The 301 (4.9) Pontiac was pretty much a one off engine. To date, I know of no one that makes any type of performance intakes for it. Most people rip out the 301 and drop in a 350, 400...whatever.....since it will bolt right in. The only options you have is the factory 301 4bbl intake......or going to the T/A turbo unit.
301 302 305 350 400 455