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Guides Title Large Port/Small Port? 7 Rib/3 Rib?
Name image Aedave
The Info
About the 4A-GE in the North American market Corolla
Pay close attention to each description

AE86 4A-GE

1984-EARLY 1987
LARGE PORT TVIS HEAD AND INTAKE(BLUE LETTERS)
3 RIB BLOCK 9.4:1 COMPRESSION RATIO
SMALLER 40MM CON ROD JOURNAL(CRANKPIN)
SMALLER 18MM PISTON PIN(PRESS FIT)

LATER 1987(04??/87)-END OF PRODUCTION
LARGE PORT TVIS HEAD AND INTAKE(BLUE LETTERS)
7 RIB BLOCK 9.4:1 COMPRESSION RATIO
SMALLER 40MM CON ROD JOURNAL(CRANKPIN)
SMALLER 18MM PISTON PIN(PRESS FIT)

AE92 4A-GE

1988-1989
LARGE PORT TVIS HEAD AND INTAKE(RED LETTERS)
7 RIB BLOCK 9.4:1 COMPRESSION RATIO
LARGER 42MM CON ROD JOURNAL(CRANKPIN)
LARGER 20MM PISTON PIN(FULL FLOATING)

1990(9/89)-1991(6/91)END OF PRODUCTION
SMALL PORT/NO TVIS/INTAKE HAS RIBS(RED LETTERS)
7 RIB BLOCK 10.3:1 COMPRESSION RATIO
LARGER 42MM CON ROD JOURNAL(CRANKPIN)
LARGER 20MM PISTON PIN(FULL FLOATING)
PISTON OIL SQUIRTERS/OIL DRAIN@REAR INTAKE SIDE

Other notes:
All came with EGR systems
All came with Air meters (except ae92 GeoPrism GSI MAP)
The small port used a different air meter and had a knock sensor
the ae92 7 rib engines have a fully counterweighted crankshaft (heavyer/stronger/smoother)
3 rib engines have a partially counterweighted crankshaft (lighter/not as smooth)
Small port engines have a higher volume oil pump!
Pistons do not interchange without machine work!

As you have read Do Not refer to the 4A-GE as red top or blue top its in accurate. There is a Large port engine that came in the Ae92 in 1988 and 1989 that had red lettering.
The above info is correct to my knowledge and experience, it was not just gathered from the internet

 

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