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Parts for MerCruiser Race Engine and Drive 420 GM 454 V-8 1987-1989 Cylinder Head & Rocker Cover

Engine Diagram

Ref. No. Part No. Description Manufacturer List Price Your Price Order
#1 821948A 1 COVER ASSEMBLY, Rocker (2 required per assembly) SN# 0A398941 THRU 0D725769
COVER ASSY-VALVE  O - Replaced by -821948T 1  
821948A 1This part has been superseded. COVER ASSY-VALVE O - Replaced by -821948T 1
(more info)
    UnavailableUnavailable Parts
VALVE COVER       O NLA  
821948T 1 VALVE COVER O NLA
(more info)
    UnavailableUnavailable Parts
#1 821948A 3 COVER ASSSEMBLY, Rocker (2 required per assembly) SN# 0D725770 THRU 0D937011
COVER ASSY-(BLUE) O - Replaced by -821948A 4  
821948A 3This part has been superseded. COVER ASSY-(BLUE) O - Replaced by -821948A 4
(more info)
    UnavailableUnavailable Parts
COVER ASSY-VALVE  O - Replaced by -821948T 4  
821948A 4This part has been superseded. COVER ASSY-VALVE O - Replaced by -821948T 4
(more info)
    UnavailableUnavailable Parts
VALVE COVER,NLA 821948T 4  
821948T 4OEM Part 821948T 4 - Valve Cover, NLA (more info) About Mercury Marine $385.00 $385.00 Add to shopping cart
2 in stock. Explain stock levels
#2 25-49767 GROMMET, Rocker Cover (2 required per assembly)
GROMMET           O NLA 25-49767
25-49767 GROMMET O NLA
(more info)
    UnavailableUnavailable Parts
#3 24-70086 SPRING, Filler Cap (2 required per assembly) SN# 0A398941 THRU 0D725769
SPRING,NLA 24-70086  
24-70086OEM Part 24-70086 - Spring, NLA (more info) About Mercury Marine $25.00 $25.00 Add to shopping cart
10+ in stock. Explain stock levels
#4 42336 CAP, Oil Filler (2 required per assembly) SN# 0A398941 THRU 0D725769
CAP               O - Replaced by -49288  
42336This part has been superseded. CAP O - Replaced by -49288
(more info)
    UnavailableUnavailable Parts
17345 49288  
49288OEM Part 49288 - Cap (more info) About Mercury Marine $18.70 $18.70 Add to shopping cart
10 in stock. Explain stock levels
CAP 17345 17345
17345OEM Part 17345 - Oil Filler Cap (more info) About Mercury Marine $25.17 $25.17 Add to shopping cart
Available to order:
Usually ships
within 8 days
#4 36-811569 CAP, Oil Tank, Oil Filler (2 required per assembly) SN# 0D725770 THRU 0D937011
CAP Oil Tank 36-811569  
36-811569OEM Part 36-811569 - Oil Fill Cap (more info) About Mercury Marine $24.92 $24.92 Add to shopping cart
2 in stock. Explain stock levels
#5 41598 BREATHER, Rocker Cover (2 required per assembly) 420 Models
41598T 41598  
41598OEM Part 41598 - Breather - Black (more info) About Mercury Marine $19.90 $19.90 Add to shopping cart
1 in stock. Explain stock levels
BREATHER-BLACK    O NLA  
41598T BREATHER-BLACK O NLA
(more info)
    UnavailableUnavailable Parts
#5 14902 BREATHER, Rocker Cover (2 required per assembly) 425 Models
ORD 41598T        O NLA 14902
14902 ORD 41598T O NLA
(more info)
    UnavailableUnavailable Parts
#6 37-818991 DECAL, 420 Models (2 required per assembly)
DECAL 37-818991  
37-818991OEM Part 37-818991 - Decal (more info) About Mercury Marine $36.13 $36.13 Add to shopping cart
Available to order:
Usually ships
within 8 days
#7 16-56766 STUD, (.250-20/.250-28 x 1.380) (14 required per assembly)
STUD (.250-20/.25 16-56766 16-56766
16-56766OEM Part 16-56766 - Stud - Priced Individually (more info) About Mercury Marine $2.40 $2.40 Add to shopping cart
Available to order:
Usually ships
within 8 days
#8 12-39143 WASHER, (.253 x .625 x .0937) (14 required per assembly)
WASHER (.253 x .6 12-39143 12-39143
12-39143OEM Part 12-39143 - Washer - Priced Individually (more info) About Mercury Marine $6.50 $4.40 Add to shopping cart
10+ in stock. Explain stock levels
#9 11-20361 NUT, (.250-28) (14 required per assembly)
118267089 11-20361 11-20361
11-20361OEM Part 11-20361 - Nut Note: Must be ordered in multiples of 5 (more info) About Mercury Marine $0.60 $0.60 Add to shopping cart
10+ in stock. Explain stock levels
NUT (.250-28) 11-826708  9 11-826708 9
11-826708 9OEM Part 11-826708 9 - Nut - Priced Individually (more info) About Mercury Marine $1.00 $1.00 Add to shopping cart
7 in stock. Explain stock levels
S.S. Steel Locknut 18-3722-9
18-3722-9OEM Match 18-3722-9 - Lock Nut, 121731, 11-35888 (more info)
Replaces OEM #0121731
About Sierra Marine $14.95 $7.67 Add to shopping cart
Available to order:
Usually ships
within 8 days
#10 27-14765 GASKET, Rocker Cover (2 required per assembly)
GASKET 27-14765 27-14765
27-14765OEM Part 27-14765 - Gasket (more info) About Mercury Marine $127.08 $127.08 Add to shopping cart
3 in stock. Explain stock levels
Rocker Cover Gasket 18-25001
18-25001OEM Match 18-25001 - Gasket 27-14765 - Special Order - No Returns (more info) About Sierra Marine $65.49 $62.70 Add to shopping cart
In stock - special order item. Explain stock levels
#11 848263 PUSH ROD, Vavle (8 required per assembly) Intake
PUSH ROD 848263 848263
848263OEM Part 848263 - Push Rod (more info) About Mercury Marine $24.04 $24.04 Add to shopping cart
Available to order:
Usually ships
within 8 days
#11 848266 PUSH ROD, Valve (8 required per assembly) Exhaust
PUSH ROD 848266 848266
848266OEM Part 848266 - Push Rod (more info) About Mercury Marine $24.04 $24.04 Add to shopping cart
Available to order:
Usually ships
within 8 days
#12 13024 VALVE, Exhaust - Standard (8 required per assembly)
VALVE-EXHAUST     O - Replaced by -843080 13024
13024This part has been superseded. VALVE-EXHAUST O - Replaced by -843080
(more info)
    UnavailableUnavailable Parts
VALVE Exhaust 843080 843080
843080OEM Part 843080 - Exhaust Valve (more info) About Mercury Marine $116.87 $116.87 Add to shopping cart
Available to order:
Usually ships
within 8 days
#13 16-95820 STUD, Rocker Arm Valve (16 required per assembly) SN# 0A398941 THRU 0D725499
STUD Rocker Arm V 16-95820 16-95820
16-95820OEM Part 16-95820 - Stud (more info) About Mercury Marine $10.00 $10.00 Add to shopping cart
1 in stock. Explain stock levels
#13 16-821836 STUD, Rocker Arm Valve (16 required per assembly) SN# 0D725500 THRU 0D937011
STUD 16-821836 16-821836
16-821836OEM Part 16-821836 - Stud (more info) About Mercury Marine $24.28 $24.28 Add to shopping cart
Available to order:
Usually ships
within 8 days
#14 49132 GUIDE, Push Rod (8 required per assembly) SN# 0A398941 THRU 0D725499
GUIDE 49132 49132
49132OEM Part 49132 - Guide (more info) About Mercury Marine $12.25 $12.25 Add to shopping cart
6 in stock. Explain stock levels
#14 811586 GUIDE, Push Rod (8 required per assembly) SN# 0D725500 THRU 0D937011
GUIDE             O - Replaced by -845707  
811586This part has been superseded. GUIDE O - Replaced by -845707
(more info)
    UnavailableUnavailable Parts
GUIDE             O - Replaced by -881686 845707
845707This part has been superseded. GUIDE O - Replaced by -881686
(more info)
    UnavailableUnavailable Parts
GUIDE 881686 881686
881686OEM Part 881686 - Guide (more info) About Mercury Marine $13.30 $13.30 Add to shopping cart
Available to order:
Usually ships
within 8 days
#15 24-13455 SPRING, Valve (16 required per assembly)
SPRING            O - Replaced by 24-13455T  
24-13455This part has been superseded. SPRING O - Replaced by 24-13455T
(more info)
    UnavailableUnavailable Parts
VAVLE SPRING ASSE 24-13455T 24-13455T
24-13455TOEM Part 24-13455T - Spring (more info) About Mercury Marine $26.10 $26.10 Add to shopping cart
Available to order:
Usually ships
within 8 days
#16 98598 RETAINER, Valve Spring (16 required per assembly)
RETAINER          O - Replaced by -843376  
98598This part has been superseded. RETAINER O - Replaced by -843376
(more info)
    UnavailableUnavailable Parts
RETAINER 843376 843376
843376OEM Part 843376 - Retainer (more info) About Mercury Marine $15.77 $15.77 Add to shopping cart
Available to order:
Usually ships
within 8 days
#17 15832 SEAL, Valve Stem (16 required per assembly)
SEAL              O - Replaced by 26-827645  
15832This part has been superseded. SEAL O - Replaced by 26-827645
(more info)
    UnavailableUnavailable Parts
SEAL Valve 26-827645 26-827645
26-827645OEM Part 26-827645 - Seal (more info) About Mercury Marine $17.50 $14.99 Add to shopping cart
Available to order:
Usually ships
within 8 days
#18 15-54531 SHIM, Valve Spring (.015) (16 required per assembly)
SHIM-.015 @2      O - Replaced by 15-845669  
15-54531This part has been superseded. SHIM-.015 @2 O - Replaced by 15-845669
(more info)
    UnavailableUnavailable Parts
SHIM-.015 @2      O  
15-845669 SHIM-.015 @2 O
(more info)
    UnavailableUnavailable Parts
#18 15-77624 SHIM, Valve Spring (.030) (8 required per assembly)
SHIM Valve Spring 15-77624  
15-77624OEM Part 15-77624 - Shim -.030 (more info) About Mercury Marine $3.50 $3.50 Add to shopping cart
Available to order:
Usually ships
within 8 days
#19 96028 LOCK, Valve Stem (32 Keys) (1 required per assembly)
LOCK-VALVE @2     O NLA 96028
96028 LOCK-VALVE @2 O NLA
(more info)
    UnavailableUnavailable Parts
#20 69304 ARM, Valve Rocker (16 required per assembly)
ROCKER ARM        O - Replaced by -69304T  
69304This part has been superseded. ROCKER ARM O - Replaced by -69304T
(more info)
    UnavailableUnavailable Parts
ROCKER ARM        O NLA 69304T
69304T ROCKER ARM O NLA
(more info)
    UnavailableUnavailable Parts
#21 11-44481 NUT (16 required per assembly)
NUT               O - Replaced by 11-848610 11-44481
11-44481This part has been superseded. NUT O - Replaced by 11-848610
(more info)
    UnavailableUnavailable Parts
NUT               O - Replaced by 11-8M0043537 11-848610
11-848610This part has been superseded. NUT O - Replaced by 11-8M0043537
(more info)
    UnavailableUnavailable Parts
NUT-ROCKER        O  
11-8M0043537 NUT-ROCKER O
(more info)
    UnavailableUnavailable Parts
#22 938-816778 CYLINDER HEAD ASSEMBLY (2 required per assembly) SN# 0A398941 THRU 0D725499
HEAD-CYLINDER     O - Replaced by 938-816778A 3  
938-816778This part has been superseded. HEAD-CYLINDER O - Replaced by 938-816778A 3
(more info)
    UnavailableUnavailable Parts
HEAD ASY-CYLINDER O - Replaced by 938-816778T 3  
938-816778A 3This part has been superseded. HEAD ASY-CYLINDER O - Replaced by 938-816778T 3
(more info)
    UnavailableUnavailable Parts
HEAD ASSEMBLY 938-816778T 3  
938-816778T 3OEM Part 938-816778T 3 - Cylinder Head Assembly (more info) About Mercury Marine $1,946.86 $1,946.86 Add to shopping cart
Available to order:
Usually ships
within 8 days
#22 938-811529A 4 CYLINDER HEAD KIT (2 required per assembly) (.375) 425 Models
HEAD KIT-CYLINDER O - Replaced by 938-811529  1  
938-811529A 4This part has been superseded. HEAD KIT-CYLINDER O - Replaced by 938-811529 1
(more info)
    UnavailableUnavailable Parts
HEAD-CYLINDER     O - Replaced by 938-811529T 1  
938-811529 1This part has been superseded. HEAD-CYLINDER O - Replaced by 938-811529T 1
(more info)
    UnavailableUnavailable Parts
HEAD-CYLINDER     O NLA  
938-811529T 1 HEAD-CYLINDER O NLA
(more info)
    UnavailableUnavailable Parts
#22 938-826363 2 CYLINDER HEAD KIT (2 required per assembly) (.437) 425 Models
HEAD-CYLINDER     O - Replaced by 938-826363  1  
938-826363 2This part has been superseded. HEAD-CYLINDER O - Replaced by 938-826363 1
(more info)
    UnavailableUnavailable Parts
HEAD-CYLINDER     O - Replaced by 938-826363T 1  
938-826363 1This part has been superseded. HEAD-CYLINDER O - Replaced by 938-826363T 1
(more info)
    UnavailableUnavailable Parts
CYLINDER HEAD     O NLA  
938-826363T 1 CYLINDER HEAD O NLA
(more info)
    UnavailableUnavailable Parts
#23 821024 VALVE, Inlet - Standard (2.250) (8 required per assembly)
VALVE-INLET       O - Replaced by -821024T  
821024This part has been superseded. VALVE-INLET O - Replaced by -821024T
(more info)
    UnavailableUnavailable Parts
VALVE Intake 821024T 821024T
821024TOEM Part 821024T - Inlet Valve (more info) About Mercury Marine $80.92 $80.92 Add to shopping cart
Available to order:
Usually ships
within 8 days
#24 27-13687 GASKET, Cylinder Head (2 required per assembly) SN# 0A398941 THRU 0D725499
278M0049045 27-13687 27-13687
27-13687OEM Part 27-13687 - Head Gasket (more info) About Mercury Marine $59.90 $59.90 Add to shopping cart
4 in stock. Explain stock levels
GASKET 27-8M0049045 27-8M0049045
27-8M0049045OEM Part 27-8M0049045 - Head Gasket ZZ (more info) About Mercury Marine $69.90 $59.86 Add to shopping cart
Available to order:
Usually ships
within 8 days
Head Gasket 18-3877
18-3877OEM Match 18-3877 - Head Gasket 454 Early Style (more info)
Replaces OEM #0914849
About Sierra Marine $53.49 $42.69 Add to shopping cart
Available to order:
Usually ships
within 8 days
#24 27-811546 GASKET, Cylinder Head (2 required per assembly) SN# 0D725500 THRU 0D937011
GASKET            O - Replaced by 27-879150139 27-811546
27-811546This part has been superseded. GASKET O - Replaced by 27-879150139
(more info)
    UnavailableUnavailable Parts
GASKET-CYL HEAD 27-879150139 27-879150139
27-879150139OEM Part 27-879150139 - Cylinder Head Gasket (more info) About Mercury Marine $102.50 $87.76 Add to shopping cart
1 in stock. Explain stock levels
Head Gasket 18-3874
18-3874OEM Match 18-3874 - Head Gasket 502 (more info)
Replaces OEM #3853511
About Sierra Marine $126.99 $102.82 Add to shopping cart
Available to order:
Usually ships
within 8 days
#25 10-49106 1 BOLT (2.00 Inch) Cylinder Head (8 required per assembly)
SCREW             O - Replaced by 10-845706M 2  
10-49106 1This part has been superseded. SCREW O - Replaced by 10-845706M 2
(more info)
    UnavailableUnavailable Parts
ORD 8M0102366     O NLA  
10-845706M 2 ORD 8M0102366 O NLA
(more info)
    UnavailableUnavailable Parts
#26 10-49105 BOLT, (4.125 Inch), Cylinder Head (24 required per assembly)
SCREW             O - Replaced by 10-845705  
10-49105This part has been superseded. SCREW O - Replaced by 10-845705
(more info)
    UnavailableUnavailable Parts
ORD 8M0102366     O NLA  
10-845705 ORD 8M0102366 O NLA
(more info)
    UnavailableUnavailable Parts
#- 27-13218A 1 GASKET SET (1 required per assembly) SN# 0A398941 THRU 0D725499
GASKET SET        O NLA  
27-13218A 1 GASKET SET O NLA
(more info)
    UnavailableUnavailable Parts
#- 27-808730A92 GASKET SET (1 required per assembly) SN# 0D725500 THRU 0D937011
GASKET SET        O - Replaced by 27-808730A98  
27-808730A92This part has been superseded. GASKET SET O - Replaced by 27-808730A98
(more info)
    UnavailableUnavailable Parts
GASKET SET        O NLA 27-808730A98
27-808730A98 GASKET SET O NLA
(more info)
    UnavailableUnavailable Parts