FS Revisions & Redesigns
Reference by year:1993
Head revised slightly(late 93).
1994
Cams revised(rumored be slightly more aggressive).
Crank revised(mid 94).
1995
Intake manifold revised for OBD-II emissions(late 95, same basic design).
Pistons revised.
Crank revised(late 95).
1997
Crank revised.
1998
Throttle body redesigned(larger).
New intake manifold equipped with VICS introduced for the protg.
Old intake manifold(non-VICS) redesigned(less torque bias) for the 626.
Head redesigned(larger ports - FS9 casting).
Valve springs revised.
Lifters redesigned(SLAs replaced HLAs).
Cams revised for solid lifters and slightly improved power and torque.
Pistons revised.
Block revised(allows for the OEM oil cooler, also rumored to be stronger and have more coolant passages).
2000
Intake cam revised for improved emissions(no change to the exhaust cam).
Pistons revised.
Crank redesigned(forged crank replaced cast crank).
2002
Throttle body revised(mid 02).
Rods revised in the advent of the MSP(rumored to be only tolerance revisions).
Head revised slightly(late 93).
1994
Cams revised(rumored be slightly more aggressive).
Crank revised(mid 94).
1995
Intake manifold revised for OBD-II emissions(late 95, same basic design).
Pistons revised.
Crank revised(late 95).
1997
Crank revised.
1998
Throttle body redesigned(larger).
New intake manifold equipped with VICS introduced for the protg.
Old intake manifold(non-VICS) redesigned(less torque bias) for the 626.
Head redesigned(larger ports - FS9 casting).
Valve springs revised.
Lifters redesigned(SLAs replaced HLAs).
Cams revised for solid lifters and slightly improved power and torque.
Pistons revised.
Block revised(allows for the OEM oil cooler, also rumored to be stronger and have more coolant passages).
2000
Intake cam revised for improved emissions(no change to the exhaust cam).
Pistons revised.
Crank redesigned(forged crank replaced cast crank).
2002
Throttle body revised(mid 02).
Rods revised in the advent of the MSP(rumored to be only tolerance revisions).
Quick reference by part:
Throttle body: 98, mid 02
Intake manifold: late 95, 98, 00
Head: late 93, 98
Valve springs: 98
Lifters: 98
Cams: 94, 98
Pistons: 95, 98, 00
Rods: 02
Crank: mid 94, late 95, 97, 00
Block: 98
Intake manifold: late 95, 98, 00
Head: late 93, 98
Valve springs: 98
Lifters: 98
Cams: 94, 98
Pistons: 95, 98, 00
Rods: 02
Crank: mid 94, late 95, 97, 00
Block: 98