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Popular Pontiac Engines top horsepower at RPM
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1970 400 CID Ram Air III
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345 HP @
5000 RPM
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1970 400 CID Ram Air IV
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370 HP @
5500 RPM
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1971 455 CID H.O.
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335 HP @
4800 RPM
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1972 455 CID
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300 HP @
4000 RPM
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1973 455 CID
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250 HP @
4000 RPM
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1973/74 455 CID
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290 HP @
4000 RPM
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1975 455 CID
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200 HP @
3500 RPM
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1976 400 CID
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185 HP @
3600 RPM
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1976 455 CID
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200 HP @
4000 RPM
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1977/78 400 CID
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180 HP @
3600 RPM
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1977/79 403 CID (Olds)
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185 HP @
3600 RPM
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1977 400 CID T/A6.6
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220 HP @
4000 RPM
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1978/79 400 CID T/A6.6
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220 HP @
4000 RPM
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1979/81 301 CID T/A4.9
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150 HP @
4400 RPM
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1980 301 CID T/A4.9 Turbo
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210 HP @
4000 RPM
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1981 301 CID T/A4.9 Turbo
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200 HP @
4000 RPM
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Transmission Gears
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Turbo-Hydromatic 250/350
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First Gear
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2.52:1
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Second Gear
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1.52:1
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Third Gear
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1:1
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4 Speed Manual
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First Gear
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Second Gear
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Third Gear
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Fourth Gear
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10 Bolt Rear Axle Gear Ratios
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Standard gearing for 403 Automatic transmission
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2.41:1
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Standard gearing for 400 Automatic
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2.56:1
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Optional rear end for most automatics
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2.73:1
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Standard gearing for Turbo engines and Super Duty with Air Conditioning
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3.08:1
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Standard gearing for 4 speed car (220 HP 77 - 78 w/ Auto Trans)
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3.23:1
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Option for early model (Super Duty with out Air Conditioning)
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3.42:1
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Early model 4 speed
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3.73:1
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4.10.1
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Popular Tire Circumference
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P225 70R15
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85.44 inches
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P255 60R15
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83.75 inches
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P235 60R16
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84.375 inches
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