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A  I.D. Exhaust Seat Hole in Cylinder Head  1.994 1.996 
B-D-G-J-S-T-Y-BD-BE  I.D. Exhaust Seat Hole in Cylinder Head  1.733 1.735 
523  S9-S10-T2-T3-AF  Exhaust Seat Hole in Cylinder Head  1.926 1.928 
612 524  A  Intake Valve Seat and Cylinder Head  .0070T .0105T  (A) 
B-D-G-J-S-T-Y-AF-BD BE  Intake Valve Seat and Cylinder Head  .0065T .010T  (A) 
A  O.D. Intake Seat  2.0965 2.0975 
A1-B-D  O.D. Intake Seat  1.9265 1.928 
B1-C-J-S-T-Y-BD-BE  O.D. Intake Seat  2.0815 2.083 
S1-S2-S3-S5-S6-S7-S9-S10-T2-T3-AF  O.D. Intake Seat  2.2885 2.290 
A  I.D. Intake Seat Hole in Cylinder Head  2.087 2.089 
Al-B-D  I.D. Intake Seat Hole in Cylinder Head  1.918 1.920 
B1-G-J-S-T-Y-BD BE  I.D. Intake Seat Hole in Cylinder Head  2.073 2.075 
S1-S2-S3-S5-S6-S7-S9-S10-T2-T3-AF  I.D. Intake Seat Hole in Cylinder Head  2.280 2.282 
613  526  ALL  Exhaust Valve Guide and Cylinder Head  .001T .0025T  (A) 
613 527 SSP1776  A-B-D-G-J  O.D. Exhaust Valve Guide  .5933 .5938 

1-8

PART 1 DIRECT DRIVE ENGINES
SECTIONII CYLINDERS

Ref. Ref. Chart New Old
613 257 Y G-J-S-T-AF-BD-BE
T-AF-BD-BE S1 A-B-D-J 613 527 Y G-J-S-T-AF-BD
T-AF-BD
S1

614 527  ALL ALL ALL
615 528 A-B-D 528 A1-G-J-S-T-BD-BE
J-S-T-BD-BE
Y
S1-S2-S3-S5-S6-T2-T3-AF S7-S9-S10
A-B-D Al G-J-Y G-J-S-T-BD-BE
T-BD-BE S1-S2-S3-S5-S6-S7-

S3-S5-S6-S7-S9-S10-T2-T3-AF
0-T2-T3-AF

SSP1776
Nomenclature
O.D.
Exhaust ValveGuide

O.D.
Exhaust ValveGuide

O.D.
Exhaust ValveGuide

I.D.
Exhaust ValveGuide Hole in Cylinder Head

I.D.
Exhaust Valve Guide Hole in Cylinder Head

I.D.
Exhaust ValveGuide Hole in Cylinder Head

I.D.
Exhaust ValveGuide Hole in Cylinder Head

Intake Valve Guide and Cylinder Head
O.D. Intake Valve Guide
I.D. Intake Valve Guide Hole in Cylinder Head
Exhaust ValveStem and Valve
Guide

Exhaust ValveStem and Valve Guide (Parallel Valve Heads)
Exhaust Valve Stem and Valve Guide
Exhaust Valve Stem and Valve Guide (Angle Valve Heads)
Exhaust Valve Stem and Valve Guide (Angle Valve Heads -Helicopter)
O.D.
Exhaust Valve Stem

O.D.
Exhaust Valve Stem

O.D.
Exhaust Valve Stem

O.D.
Exhaust Valve Stem (Parallel Valve Heads)

O.D.Exhaust Valve Stem (AngleValveHeads)
1-9
Dimensions Clearances Mfr. Mfr. Min. Serv. Min. Serv.
& Max. & Max. Max. Max.
.6267
　
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