ENGINE, COMPLETE

A "complete" engine means cylinder block and heads. It does not include accessories such as alternator, water pump, A/C compressor, etc., although some of these parts from a donor engine may coincidentally fit the Fiero.

'84-86 Fiero 2.5L Engine: Is the same as:

Pontiac 6000       '84-86 2.5L VIN "R" 
Chevy Celebrity    '84-86 2.5L VIN "R" 
Buick Century      '84-86 2.5L VIN "R" 
Olds Cutlass Ciera '84-86 2.5L VIN "R" 
Chevrolet Citation '84    2.5L VIN "R" 
Olds Omega         '84    2.5L VIN "R" 
Pontiac Phoenix    '84    2.5L VIN "R" 
Buick Skylark      '84-85 2.5L VIN "R"

'84-86 Fiero 2.5L Engine: The following engines can be used in a Fiero if injector and carburetor are switched, vacuum pump hole is covered, and distributors are changed. (These engines do not have the coil in the cap and they use a different distributor gear.)

 
Chevrolet Citation  '80-81 2.5L VIN "5" 
Olds Omega          '80-81 2.5L VIN "5" 
Pontiac Phoenix     '80-81 2.5L VIN "5" 
Buick Skylark       '80-81 2.5L VIN "5"

'84-86 Fiero 2.5L Engine: The following engines can be used in a Fiero if the vacuum pump hole is covered.

Pontiac 6000         '82-83 2.5L VIN "R" 
Chevrolet Celebrity  '82-83 2.5L VIN "R" 
Buick Century        '82-83 2.5L VIN "R" 
Olds Cutlass Ciera   '82-83 2.5L VIN "R" 
Chevrolet Citation   '82-83 2.5L VIN "R" 
Olds Omega           '82-83 2.5L VIN "R" 
Pontiac Phoenix      '82-83 2.5L VIN "R" 
Buick Skylark        '82-83 2.5L VIN "R"

'87 Fiero 2.5L Engine: The following engines can be used in a Fiero except for the flywheel or flexplate. Change induction, exhaust, and electrical systems, pilot bushings as necessary. Will not interchange with '88 engines due to oil pan interference with frame.

Pontiac 6000        '87 2.5L VIN "R"
Chevrolet Celebrity '87 2.5L VIN "R"
Buick Century       '87 2.5L VIN "R"
Olds Cutlass Ciera  '87 2.5L VIN "R"

The following information was posted to Pennock's Fiero Forum by "Ray" from Houston, TX:

It is possible to get a better 2.5L engine for the '87-88 2.5L Fiero from a 1993 S-10. The 2.5L engine from the '93 S-10 should provide over 100 HP and considerably better mileage.

'88 Fiero 2.5L Engine: The following engines can be used in a Fiero except for the flywheel or flexplate. Change induction, exhaust, and electrical systems, pilot bushings as necessary. Will not interchange with '87 engines due to oil pan interference with frame.

Pontiac 6000        '88-89 2.5L VIN "R"
Chevrolet Celebrity '88-89 2.5L VIN "R"
Buick Century       '88-89 2.5L VIN "R"
Olds Cutlass Ciera  '88-89 2.5L VIN "R"

'85-88 Fiero 2.8L: The 2.8L Fiero VIN "9" engines are unique. There are no other automobile engines EXACTLY like these that can be dropped into a Fiero. However, other engines will fit with minor modifications noted below.

The following engines can be used in the Fiero by changing the intake manifolds, exhaust manifolds, fuel delivery system, and removing the power steering brackets:

Pontiac 6000        '82-84 2.8L VIN "X" & VIN "Z" 
Pontiac 6000        '85-86 2.8L Two-barrel carb VIN "X" 
Chevrolet Celebrity '82-84 2.8L VIN "X" 
Chevrolet Celebrity '85-86 2.8L Two-barrel carb VIN "X" 
Buick Century       '82-86 2.8L VIN "X" 
Olds Cutlass Ciera  '82-85 2.8L VIN "X" 
Olds Cutlass Ciera  '86    2.8L Two-barrel carb VIN "X" 
Chevrolet Citation  '82-84 2.8L VIN "X" & VIN "Z" 
Olds Omega          '82-84 2.8L VIN "X" & VIN "Z" 
Pontiac Phoenix     '82-83 2.8L VIN "X" & VIN "Z" 
Buick Skylark       '82-84 2.8L VIN "X" & VIN "Z" 
Buick Skylark       '85    2.8L Two-barrel carb VIN "X"

'85-88 Fiero 2.8L: The following engines can be used in the Fiero by changing the intake and exhaust manifolds and removing the power steering brackets:

Pontiac 6000         '85'-86 2.8L EFI, VIN "W" 
Chevrolet Celebrity  '85'-86 2.8L EFI, VIN "W" 
Olds Cutlass Ciera   '86     2.8L EFI, VIN "W" 
Chevrolet Citation   '85     2.8L EFI, VIN "W" 
Buick Skylark        '85     2.8L EFI, VIN "W"

'85-88 Fiero 2.8L: The following engines can be used in the Fiero by changing the intake and exhaust manifolds, drive belt system, and removing the power steering brackets:

Chevrolet Cavalier  '85-86 2.8L VIN "W"
Cadillac Cimarron   '85-86 2.8L VIN "W"
Olds Firenza        '85-86 2.8L VIN "W"

NOTE: A popular swap for the Fiero 2.8L engine is a 3.4L engine from a '93-95 Camaro or Firebird. This engine requires simple modifications that are beyond the scope of this manual. Other popular swaps are the Chevrolet Small Block V8 and the Cadillac 4.9L V8. For more information check v8archie.com and thefierofactory.com.