ENGINE YEAR

DESCRIPTION

CASTING # Part #
Chevrolet 8 Cylinder 
265 (4.3L) 94-96 Vin W, Gen II engines, reverse cooling, MFI 10208890 4943
267, 305 75-79 267 all, 305 w/2 barrel Carb 434 4849
4.8L 99-04 LR-4 OHV Aluminum heads, light duty truck, vin V 862 4948
305 (5.0L)

 

 

 

78-85 1.840 intake valve, 65cc chamber, 7th bolt hole {1} 416, 450 4852
82-86 HO, small 55cc chamber 601 4859
87-95 Center valve cover bolt 081, 187 4952
96-01 VORTEC engine, 4 intake bolts in each head 12552520, 12558059 4959
307 68-70 Large spark plug, 1.720" intake valve 185 4855
5.3L (323ci) 99-05 LM-7 OHV Aluminum heads, light duty truck, vin T 832, 706 4948
307, 327, 350 71-73 Small spark plug, 1.720" intake valve 339, 991 4847
327, 350 68-70 Large spark plug, 1.940" intake valve 441, 126 4845
350 (5.7L)








 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

71-77 All Cars & 10 Series Trucks, Small spark plug, 1.940" intake valves 882, 993, 487, 336 4850
20 & 30 Series Trucks, small spark plug, 1.940" intake valves,  3/8" exhaust valve stems, medium duty truck 882, 993, 487, 336 4850-3
78-81 20 & 30 Series Trucks, light weight casting, 1/2" NPT temp sending unit, 3/8" exhaust valve stems, 7th bolt hole {1} 624 4851-2
78-86 Passenger Car & 10 Series Trucks, 3/8" NPT temperature sending unit hole, large intake valve, 7th bolt hole {1} 624 4851-7
82-86 20 & 30 series Trucks, Small intake valve, 3/8" NPT temp sending unit, 3/8" exhaust valve stems, 7th bolt hole {1} 261, 624


4851

87-88 Passenger Car & 10 Series Trucks, EXCEPT police, center valve cover bolt, square push rod hole, FI 14102193 4950-S
89-95 Pass Car & 10 Series Trucks, round push rod holes, FI 14102193 4950
87-92 Center valve cover bolt, Police, vin 8, w/Carb (not TBI or FI) 14101083, 14066217 4951
87-95 20 & 30 Series Truck, 3/8 exhaust valve, center valve cover bolt 14102191 4950-3
90-95 Trucks over 8500 GVW, rotators on all springs, center valve cover bolt 10110810 4960
92-97 LT1, vin P, Aluminum, SFI, OBDII 10128374, 10128649 4974
90-95 Corvette, vin J, DOHC 32v, right side 10106178, 10174389 4978
Corvette, vin J, DOHC 32v, left side 10106179, 10174390 4979
94-96 LT1, vin P, Gen II Cast Iron heads 10125320, 12554290 4990
96 LT4, OBDII, 53cc Aluminum 10239902, 1255690 4996
97-98 Vin G, LS1, GEN III, Corvette, Camaro, & Firebird, perimeter valve cover bolts 12558806 4997
96-99 20 to 30 Series Trucks, VORTEC engine, 4 intake bolts in each head, vin R 10239906, 12558062 4906
99-00 Vin G, LS1, GEN III, Corvette, Camaro, & Firebird, center valve cover bolts 12559853 4909
00- GTZ Corvette, LS1, GEN III, 38cc aluminum head 12480005 4905
10 to 30 Series Truck, 8mm rocker arm bolts 10235772 4907
6.0L (364ci)

 

99-00 LQ-4 OHV, Cast Iron, 2500 Series Truck, vin U 2561873 4973
01-04 OHV Aluminum heads   4975
400

 

71-77 Small block, 6 bolt exhaust   4854
78-86 Small block, light wt casting, 7th bolt hole {1} 624 4856
396, 427

 

65-70 1 bolt alt mounting, closed chamber, long reach spark plug 215, 136, 854, 063 4857
2 bolt alt mounting, closed chamber   4842
402, 454 70-84 Open chamber, short reach tapered seat plug 741, 049, 238, 820 4846
454 (7.4L)

 

 
85-90 Small (1 5/8) intake port 045, 175, 236, 360 4844
91-95 Bolt on rockers, center bolt valve cover 10114156 4954
96-01 VORTEC, bolt on rockers, center bolt valve cover 10141279, 12553266, 12558162, 12560241 4958

picture of 7th bolt hole

Also see heavy duty truck


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