Same block, should fir right in
Pontiac 455 headers generally do not fit a Buick 455 due to differences in the engine's exhaust port locations and bolt patterns. While both engines are part of the General Motors family and share some similarities, the specific design and dimensions of the exhaust manifolds and headers vary. If you're looking to upgrade to headers for a Buick 455, it's best to choose headers specifically designed for that engine to ensure proper fit and performance.
If it's a Pontiac 350......and it should be, it is a direct swap. You don't need to change ANYTHING. Pull the 350 out and put the 455 in.
yes, same bolt pattern. Chances are the 455 buick had a turbo hydromnatic 400 transmission, hopefully that is what your 350 had. If not, crossmember, driveshaft and linkage will all have to be modified or changed.
How do you set distubitor timing on pontiac 455?
The Pontiac 455 came in 3 versions. Base, High Output, and Super Duty. The base 1970-71 engine produced 200 hp and 455 lb/ft torque. The Super Duty 1970-71 engine had 335 hp and 480 lb/ft torque. Power was reduced after 1971. The Buick 455 came in 2 versions. The 1970 Base engine had 350 hp and 510 lb/ft torque. The Stage 1 engine had 360 hp and 510 lb/ft torque. So as you can see the Buick was the more powerful engine by far.
No, they are completely different.
No. they are different head designs.
Kit available at auto parts w/instructions
No, they are not the same engine. The Oldsmobile 455 had a bore and stroke of: 4.126 X 4.25 The Pontiac 455 had a bore and stroke of: 4.152 X 4.21
yes
Yes, you didn't say which brand (Pontiac, buick, oldsmobile?) All are different but all have potential.
Answer Anonymously What is the diagram and firing order for a 76 Pontiac trans am 455 engine?