Horsepower and torque specs varied greatly depending on the year of production, highest per year were:
1970 455 =360-370hp@4600, 500lbft@2900 (hp depending on chassis engine was installed in, GTO got the lower hp rating) (only year of high compression 455, standard D port cylinder heads)
1971 455ho=335hp@4800rpm, 480lbft@3200(Round port heads, first year of low compression, massive torque, great street engine)
1972 455ho=300hp@4000rpm 415lbft@3200 (Round port heads, new sae net rating system, slight cylinder head change, nearly same engine as 1971)
1973-1974 455sd=290hp@4000rpm, 390lbft@3600rpm (Round port heads, under rated the strongest 455 Pontiac ever produced)
1975-1976 455=200hp@3500rpm (smog motor low performance)
There were several other lower performance 455 Pontiacs produced during the engines 1970-1976 run. Those listed above are the highest performance available each year.
Engine parameters for all 455 Pontiacs:
bore-4.15
stroke-4.21
Main bearing size-3.25
rod bearing size-2.25
connecting rod legnth-6.625
How do you set distubitor timing on pontiac 455?
No, they are completely different.
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
Sure it will. Pontiac used the same block for all of it's 326 to 455 engines.
Answer Anonymously What is the diagram and firing order for a 76 Pontiac trans am 455 engine?
Same block, should fir right in
455
The 1987 Trans Am didn't have a 455
455 SD
Can you bolt on earlier heads/intake/exhaust manifolds.. from a 1970 Pontiac 455 to this 76 455 engine.
No, Pontiac stopped 455 production in 1976. They are easy to swap in though.
sure y not