Exhaust Crossover Port Matchings | ||
---|---|---|
With Head | And Manifold | Use Gasket |
1965-71 | 1965-71 | 1965-71 |
1965-71 | 1972-79 | 1972-79 |
1972-79 | 1972-79 | 1972-79 |
1972-79 | 1965-71 | 1965-71** |
** Use sheet stainless steel block off plate.
In 1975 Pontiac started stamping extra numbers (1/4" tall) on their heads. These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers. 2- 101 cc's. 4- 91cc's. 6- 101cc's. 7- 98cc's. 8- 98cc's. 9- 91cc's. (Let me know if you have any more of these.)
Year(s) | Engine | HP Rating | Head # | Valve Size | CC or CR |
---|---|---|---|---|---|
1959 | 389 | 215-345HP | 531395 | 1.88/1.60 | 69 |
1960 | 389 | 215-345HP | 536109 | 1.88/1.60 | 69 |
389SD | 348-363HP | 535461 | 1.92/1.60 | 69 | |
1961 | 389 | all | 538177 | 1.88/1.60 | 69 |
421 | all | 538177 | 1.88/1.60 | 69 | |
389SD | 368/373HP | 540306 | 1.92/1.66 | 68 | |
421SD | 368/373HP | 540306 | 1.92/1.66 | 68 | |
1962 | 389 | all | 538177 | 1.88/1.60 | 69 |
421 | all | 538177 | 1.88/1.60 | 69 | |
389SD | 385/405HP | 540306/544127 | 1.92/1.66;2.02/1.76 | 68 | |
421SD | 385/405HP | 540306/544127 | 1.92/1.66;2.02/1.76 | 68 | |
1963 | 326 | 250HP | 543797 | 1.88/1.60 | 8.6 c.r. |
326 | 260/280HP | 548232 | 1.88/1.60 | 10.25 c.r. | |
389 | 215/230/235HP | 543796 | 1.88/1.60 | 8.6 c.r. | |
389 | 267/283/303/313HP | 543797 | 1.88/1.60 | 10.25 c.r. | |
421 | 320HP | 543797 | 1.88/1.60 | 10.75 c.r. | |
421 | 353/370HP | 9770716 | 1.92/1.66 | 72 | |
421SD | 390/405/410HP | 544127/9771980 | 2.02/1.76 | 64 | |
1964 | 326 | 250HP | 9773345 (845) | 1.88/1.60 | 8.6 c.r. |
326 | 280HP | 9773395 | 1.88/1.60 | 10.0 c.r. | |
389 | 215/230/235HP | 5437796 | 1.88/1.60 | 8.6 | |
389 | 267/283/303/306HP | 9773345/(845) | 1.92/1.66 | 10.5 c.r. | |
421 | 320HP | 9773345/(834) | 1.92/1.66 | 10.75 c.r. | |
389 | 325/330/348HP | 9770716 | 1.92/1.66 | 72 | |
421 | 350/370HP | 9770716 | 1.96/1.66 | 68 | |
1965 | 326 | 250HP | 62 | 1.88/1.60 | 8.6 c.r. |
326 | 285HP | 22 | 1.88/1.60 | 10.5 c.r. | |
389 | 256HP | 75 | 1.88/1.60 | 8.6 c.r. | |
389 | 290/325/333HP | 76 | 1.92/1.66 | 10.5 c.r. | |
389 | 335/338/360HP | 77 | 1.92/1.60 | 10.5 c.r. | |
421 | 338HP | 76 | 1.92/1.66 | 10.75 c.r. | |
421 | 356/376HP | 77 | 1.92/1.60 | 10.75 c.r. | |
1966 | 326 | 250HP | 094 | 1.88/1.60 | 8.6 c.r. |
326 | 285HP | 095 | 1.88/1.60 | 10.5 c.r. | |
389 | 256HP | 091 | 1.92/1.66 | 8.6 c.r. | |
389 | 290/325/333HP | 092 | 1.92/1.66 | 10.5 c.r. | |
389 | 335/360HP | 093 | 1.92/1.66 | 10.5 c.r. 68cc | |
421 | 338/350HP | 092 | 1.92/1.66 | 10.75 c.r. 70 cc | |
421 | 356/376HP | 093 | 1.92/1.66 | 10.75 c.r. 68 cc | |
1967 | 326 | 250HP | 140 | 1.92/1.64 | 9.2 c.r. |
326 | 285HP | 141 | 1.92/1.64 | 10.5 c.r. | |
400 | 255/260/265HP | 142 | 1.92/1.64 | 8.6 c.r. | |
400 | 290HP | 143/061 | 1.92/1.64 | 10.5 c.r. | |
400 | 325/333HP Big Car | 143/061 | 1.92/1.64 | 10.5 c.r. | |
400 | 350HP(GP) | 670/9787671/187 | 2.11/1.77 | 10.5 c.r. 72 cc | |
400 | 325/335/360HP | 670 | 2.11/1.77 | 72 cc | |
400 | 325/360HP RA | 670/97 | 2.11/1.77 | 72 cc | |
428 | 360/376HP | 670/9787671 | 2.11/1.77 | 72 cc | |
1968 | 350 | 265HP | 17 | 1.91/1.61 | 8.6 c.r. |
350 | 320HP | 18 | 1.91/1.61 | 10.5 c.r. | |
400 | 265HP | 14 | 1.91/1.61 | 8.6 c.r. | |
400 | 290/340HP Big Car | 15/215 | 1.91/1.61 | 10.5 c.r. | |
400 | 350HP (GP) | 16/216/62 | 2.11/1.77 | 72-75 cc | |
400 | 330HP (FB) | 16/216/62 | 2.11/1.77 | 72-75 cc | |
400 | 335/350/360HP | 16/62 | 2.11/1.77 | 72-75 cc | |
400 | 335/360HP RA I | 31/(37) | 2.11/1.77 | 72 cc | |
400 | 340(FB)/366(GTO) | R/96/A(RA II) | 2.11/1.77 | 72cc/rd port | |
428 | 375HP | 16/216 | 2.11/1.77 | 72cc | |
428 | 390HP | 16/216 | 2.11/1.77 | 72cc | |
1969 | 350 | 265HP | 47 | 1.91/1.66 | 8.6 c.r. |
350 | 325HP | 48 | 2.11/1.77 | 10.5 c.r. | |
400 | 265HP | 45 | 1.91/1.66 | 8.6 c.r. | |
400 | 290HP | 46 | 1.91/1.66 | 10 c.r. | |
400 | 340HP(GP) | 16/62 | 2.11/1.77 | 72 cc | |
400 | 330,335,350/366HP | 16/62/48(MT) | 2.11/1.77 | 72cc | |
400 | 345(FB)/370(GTO) | 722(RA-IV) | 2.11/1.77 | 71 cc | |
428 | 360HP | 16(small-valve)46 | 1.91/1.66 | 10 c.r. | |
428 | 370HP (GP) | 62 | 2.11/1.77 | 72 cc | |
428 | 390 HP | 16/62 | 2.11/1.77 | 72 cc | |
400 | 375HP(RA-V) | 44 Tunnel Port | 2.11/1.77 | 67cc | |
303 | RA=V Tunnel Port | 546184 | 2.11/1.77 | 56cc | |
1970 | 350 | 255HP | 11 | 1.94/1.66 | 8.8 c.r. |
400 | 265HP | 11 | 1.94/1.66 | 8.6 c.r. | |
400 | 290HP | 16(sm valve) | 1.94/1.66 | 10 c.r. | |
400 | 330HP Big Car | 16 | 1.94/1.66 | 10 c.r. | |
400 | 330HP | 12(m.t.) | 2.11/1.77 | 72cc | |
400 | 330HP | 13(a.t.) | 2.11/1.77 | 72cc | |
400 | 345HP(FB/RAIII) | 12 | 2.11/1.77 | 72cc | |
400 | 350HP(GP) | 13 | 2.11/1.77 | 72cc | |
400 | 350HP(GTO) | 12(MT) | 2.11/1.77 | 72cc | |
400 | 350HP(GTO) | 13(AT) | 2.11/1.77 | 72cc | |
400 | 366HP(GTO) | 12(RA III) | 2.11/1.77 | 72cc | |
400 | 370HP(RA IV) | 614(rd port) | 2.11/1.77 | 71cc | |
455 | 360HP Big Car | 15 | 1.96/1.66 | 87cc | |
400 | 360/370HP(GTO/GP) | 64 | 2.11/1.77 | 87cc | |
1971 | 350 | 250HP | 94 | 1.94/1.66 | 96cc |
400 | 265HP | 99 | 1.94/1.66 | 98cc | |
400 | 300HP | 96 | 2.11/1.77 | 96cc | |
455 | 280HP | 98 | 1.94/1.66 | 114cc | |
455 | 325HP | 66 | 2.11/1.77 | 114cc | |
455 | 335HP (455HO) | 197(191) rd port | 2.11/1.77 | 111cc | |
1972 | 350 | 175HP | 7h1 | 1.94/1.66 | 7.6cr |
400 | 200HP | 7j2 | 1.94/1.66 | 8.4cr | |
400 | 250HP | 7k3 | 2.11/1.77 | 96cc | |
455 | 200HP | 7L4 | 2.11/1.77 | 114cc | |
455 | 250HP | 7M4 | 2.11/1.77 | 114cc | |
455 | 250HP | 7M5 | 2.11/1.77 | 114cc | |
455 | 300HP(455HO) | 7F6 rd port | 2.11/1.77 | 111cc | |
1973 | 350 | 150/175HP | 46/4c | 1.96/1.66 | 96cc |
400 | 170/185HP | 46/4c | 1.94/1.66 | 98cc | |
400 | 200HP | 4x/4c | 2.11/1.66 | 98cc | |
400 | 230HP | 4x/screw-in stud | 2.11/1.66 | 98cc | |
455 | 215/250HP | 4x/screw-in stud | 2.11/1.66 | 114cc | |
455 | 290HP(455SD) | 16/X(rd port) | 2.11/1.77 | 111cc | |
1974 | 350 | 155/170HP | 46/4c | 1.94/1.66 | 7.6cr |
350 | 200HP(GTO) | 46(screw-in studs) | 2.11/1.66 | 7.6cr | |
400 | 175/190HP | 46/4c | 1.94/1.66 | 8.1cr | |
400 | 200HP | 4x/4c | 1.94/1.66 | 98cc | |
400 | 225HP(AT) | 4x(screw-in stud) | 2.11/1.66 | 98cc | |
400 | 225HP(AT) | 4c | 2.11/1.66 | 98cc | |
400 | 225HP(MT) | 4x(screw-in stud) | 2.11/1.66 | 98cc | |
455 | 215/250 | 4x(screw-in stud) | 2.11/1.66 | 114cc | |
455 | 215/250 | 4c | 2.11/1.66 | 114cc | |
455 | 290HP(455SD) | 16/X(rd port) | 2.11/1.77 | 111cc | |
1975 | 350 | ALL | 5c -4 | 2.11/1.66 | 7.6cr 91cc |
400 | ALL | 5c -8/6s -8 | 2.11/1.66 | 7.6cr 98cc | |
400 | AIR | 5c -7/6s -7 | 2.11/1.66 | 7.6cr 98cc | |
455 | AIR | 6s -6 | 2.11/1.66 | 7.6cr 101cc | |
350 | HO/non-air | 6h -2 | 2.11/1.66 | 7.6cr 91cc | |
1976 | 350 | ALL | 6X/6S | 2.11/1.66 | 7.6cr |
400 | ALL | 6X/6S | 2.11/1.66 | 7.6cr | |
455 | AIR | 6S | 2.11/1.66 | 7.6cr | |
455 | HO/non-air | 6H | 2.11/1.66 | 7.6cr | |
1977 | 301 | ALL | 01 | 1.72/1.50 | 8.2cr |
350 | ALL | 6X/6S | 2.11/1.66 | 7.6cr | |
400 | 180HP | 6X | 2.11/1.66 | 7.6cr | |
400 | 200HP | 6X | 2.11/1.66 | 8.0cr | |
1978 | 301 | ALL | 01/02 | 1.72/1.50 | 8.2cr |
350 | ALL | 6X/6S | 2.11/1.66 | 7.6cr | |
400 | 180HP | 6X | 2.11/1.66 | 7.6cr | |
400 | 220HP | 6X | 2.11/1.66 | 8.1cr | |
1979 | 301 | ALL | 01 | 1.72/1.50 | 8.2cr |
400 | ALL | 6X | 2.11/1.66 | 8.1cr |