The Mustang Source - Ford Mustang Forums - 1982-1993 5.0. H.O. history highlights.

Focus will be on the 5.0. H.O. motor. The 1982 H.O. 302 is a thin –wall casted block with a 4.00 X 3.00 bore and stroke ( ’79 used the non-thin walled heavy cast carry over block). In the late 1982 production cycle a revision to the blockwas made to change it to a one piece rear main seal , this also required aredesign of the crankshaft. Two types ofblocks have been used in the fox mustang non-roller short casting and rollertall casting block. The crank shaft wascast iron and the connecting rod where forged steel through 1993 in the fox mustang 5.0. .

Year by year 5.0. H.O. highlights :

1982

The 5.0. H.O. was introduced in the fox mustang

Imbalance changed to 50oz. and a 34oz damper

Cast aluminum pistons

351W flat tappet camshaft, duration 260* intake, 278*exhaust. Lift .416” intake & .444 exhaust

Double roller timing chain

Carry over “D9AE” heads with larger valves and upgraded valve springs

Aluminum dual plane intake manifold

369 cfm motorcraft 2 barrel carb

Dual snorker 15” high dome air cleaner

Cast iron headers

1983

600 cfm motorcraft/holley 4 barrel carb

Dual snorker 17” high dome air cleaner

Engine carried over

1984

Engine carried over

Redesigned automatic choke

Central fuel injection added for automatic transmission equipped H.O.’s

1985

Revised block with retainer bosses for roller tappets

Hydraulic roller camshaft introduced. 266* duration and .444”lift

Revised cylinder heads to allow removal of roller tappets w/o removing heads. New part # E5AE

Distributor drive gear changed to work with new steelcamshaft

Forged aluminum pistons make debut. 2 valve reliefs cut intothe tops and compression stayed 8.4:1

Carry over motorcraft/holley 4 barrel carb with improvedsecondary metering

Water pump impeller blades redsigned to improve cooling

Stainless steel tubular headers make debut on fox mustang

1986

Block revision. The block now has extra thick decks &cylinder walls. The block was cast in semi-siamese design. The upper bore wallsare fully coolant jacketed and the lower bore is cast with solid iron joiningthe cylinders.

Flat top forged aluminum pistons increased compression to9.2:1

New high swirl cylinder heads with masked valves where used. New part # E6AE

Camshaft carried over

SEFI ( sequential fuel injection) introduced on the fox. Speed density controlled sytem with 58mm TB and 19lb/hr injectors

New aluminum low drag water pump

1987

New truck cast cylinder heads with with revised combustionchamber. New part # E7TE

Forged aluminum domed pistons with 4 valve reliefs. Compression now 9.1:1

1988

Mass air on California models. 55mm mass air meter nowmeasures actual air flowing into the engine

49 state models remain carry over

Minor cam revision. Change in lobe contour makes small change to valve events. Cost about3hp

1989

Mass Air on all models

1990

carry over

1991

Cam revision to fix hole and threads in in snout of cam.

Carry over

1992

Carry over

Late ’92 production got cast hypereutectic pistons ( from searching for a firm answer, yes some owners of '92 have these pistons, no doubt has ford was getting ready for '93 production around 10/92. Research has also found that majority have found that forged piston motors had the gray oil pan and hypers had the black oil pan found on '93 and later 302's )

1993

Cast hypereutectic pistons

High torque mini starter

Carry over

1993 GT40

Cast hypereutectic pistons

GT40 cylinder heads with larger ports, valves and performance springs

1.7 roller rockers

High lift short duration camshaft. .282” lift 270* duration

GT40 cast aluminum upper/lower intake

65mm TB

70mm MAF

24lb/hr injectors

Under driven water pump & crank pulleys

Special calibrated ECC

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