To upgrade the horsepower of a 1975 Pontiac 455, consider installing a performance intake manifold and carburetor to improve airflow and fuel delivery. Upgrading the exhaust system with high-performance headers and mufflers can enhance exhaust flow and reduce back pressure. Additionally, tuning the ignition system and possibly installing a higher-performance camshaft can further increase horsepower. Finally, ensure the engine is in good condition and consider balancing and blue-printing for optimal performance.
The 1987 Trans Am didn't have a 455
250
A 1974 Oldsmobile 455 V8 has horsepower of 275 to 400. The Oldsmobile 455 was last produced in the year of 1975.
There are many ways to increase the 455 horsepower. With a cam/valve train swap and working over the heads (or replacing with aftermarket) you can be in the 500+ range. "Pontiac High Performance" is a great source for information on engine modifications.
# the 400 had 225 horse ..........the 455 had 250 horse.
365hp
18436572 #1 is drivers side, closest to the radiator.
How do you set distubitor timing on pontiac 455?
455 horsepower
No, they are completely different.
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.
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