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Technical Information
Pontiac Cylinder Head ID Numbers
Pontiac Bore & Stroke Figures

Pontiac 400 428 455 Engine Codes

Pontiac 400 428 455 Engine Casting #s

Pontiac Cylinder Head ID #s

Year Application Casting Valves CC or CR Notes
1967 400 2bbl/4bbl 061 2.11/1.77 75 Pressed in studs - Unique open chamber
1967 400 4bbl RA I 97 2.11/1.77 72 Screw in studs- taller valve springs- D port
1967 400 4bbl RA I 997 2.11/1.77 72 Screw in studs- taller valve springs- D port
1967 326 2bbl 140 1.96/1.66 9.2 CR Pressed in studs- D port
1967 326 4bbl 141 1.96/1.66 10.5 CR Pressed in studs- D port
1967 400 2bbl 142 1.96/1.66 - Pressed in studs- Low compression- D port
1967 400 2bbl/4bbl 143 1.96/1.66 75 Pressed in studs-D port
1967 400 std, HO 670 2.11/1.77 72 Screw in studs- dual valve springs- D port
1968 400 2bbl 14 1.96/1.66 90 Pressed in studs- D port (B & G Body)
1968 400 2bbl/4bbl 15 1.96/1.66 75 Pressed in studs- D port (B & G Body)
1968/69 400 std, HO 16 2.11/1.77 72 Screw in studs- dual valve springs- D port
1968 350 2bbl 17 1.96/1.66 80 Pressed in studs- D port (A & F Body)
1968 350 4bbl, HO 18 1.96/1.66 68 Pressed in studs- D port (A & F Body)
1968 400 4bbl, RAI 31 2.11/1.77 72 Screw in studs- dual valve springs- D port
(A & F Body)
1968/69 400 62 2.11/1.77 75/72 Screw in studs- dual valve springs- D port
1968 400 RAII 96 2.11/1.77 71 Screw in studs- dual valve springs- D port
1969 400 2bbl 45 1.96/1.66 8.6 CR Pressed in studs- Low Compression- D port
(B & G Body)
1969 400/428 2bbl/4bbl 46 1.96/1.66 10 CR Pressed in studs- High Comp.- D port 30 or 45 seat angle (B & G Body)
1969 350 2bbl 47 1.96/1.66 80 Pressed in studs- D port (A & F Body)
1969 350 4bbl, HO 48 2.11/1.77 69? Screw in studs- dual valve springs- D port
1969 400 MT, RA, HO 48 2.11/1.77 72 D port RAIII
1969 400 RAIV 722 2.11/1.77 71 Screw in studs- dual valve springs-ROUND port
1970 350/400 2bbl 11 1.96/1.66 85 Pressed in studs- D port
1970 400 MT, RA 12 2.11/1.77 72 D port
1970 400 13 2.11/1.77 72 D port
1970 455 2bbl/4bbl 15 1.96/1.66 87 Pressed in studs- D port (B & G Body)
1970 400 2bbl/4bbl 16 1.96/1.66 10.1 CR Pressed in studs- D port
1970 455 HO 64 2.11/1.77 87 D port
1970 400 RAIV ROUND PORT 614 2.11/1.77 71 Screw in studs- dual valve springs
1971 455 66 2.11/1.77 114 Press in studs
1971 350 2bbl 94 1.96/1.66 90 Screw in studs- D port
1971 400 4bbl 96 2.11/1.77 96 Screw in studs- dual valve springs- D port
1971 455 2bbl 98 1.96/1.66 114 Pressed in studs- D port
1971 400 2bbl 99 1.96/1.66 96 Pressed in studs- D port
1971 455 HO ROUND PORT 197 2.11/1.77 111 Screw in studs- dual valve springs
1972 455 HO ROUND PORT 7F6 2.11/1.77 111 Screw in studs- dual valve springs
1972 350 2bbl 7H1 1.96/1.77 90 Pressed in studs- 45/45 degree seats
1972 400 2bbl 7J2 1.96/1.77 96 Pressed in studs- 45/45 degree seats
1972 400 2bbl 7K3 2.11/1.77 96 Screw in studs- dual valve springs- D port
1972 455 2bbl 7L4 1.96/1.77 112 Pressed in studs- 45/45 degree seats
1972 455 4bbl 7M5 2.11/1.77 114 -
1973/74 455 SD ROUND PORT 16 2.11/1.77 111 Screw in studs- dual valve springs
1973/74 350 46 1.96/1.66 96 Press in or screw in studs
1973/74 350 4C-5H 1.96/1.66 96 Press in or screw in studs
1973/74 400 4C-8H 1.96/1.66 98 Press in or screw in studs
1973/74 455 4X-1(H) 2.11/1.66 112/114 Press in or screw in studs
1973/74 400 4X-3(H) 2.11/1.66 98 Press in studs
1973/74 400 4X-4(H) 2.11/1.66 98 Press in studs
1973/74 400 4X-7(H) 2.11/1.66 98 Screw in studs- dual valve springs
1975 350 4bbl 5C-4 2.11/1.66 93 Screw in studs
1975 350 5C-9 2.11/1.66 93 A.I.R.
1975 400 4bbl 5C-8 2.11/1.66 101 Screw in studs- 30/45 degree seats
1975 350/400 4bbl 5C-7 2.11/1.66 100 Screw in studs
1975 455 5C-6 2.11/1.66 124 Screw in studs
1975 455 4bbl 51 2.11/1.66 124 Screw in studs- 30/45 degree seats
1975/76 455 4bbl 6H 2.11/1.66 124 Screw in studs- 30/45 degree seats
1975/76 350 6S-9 2.11/1.66 93 -
1975/76 400 6S-7 2.11/1.66 100 -
1975/76 455 6S-6 2.11/1.66 124 -
1975-79 350/400 6X-4 2.11/1.66 98 Screw in studs- dual valve springs- D port
1975-79 400/455 6X-8 2.11/1.66 101 Screw in studs- dual valve springs- D port