The Pontiac Engine
-
Pontiac Firing Order
Pontiac V8265, 301, 307*, 326, 350, 389, 400, 421, 428, 455
Firing Order
Cylinder Numbering Distributor Rotation 
Rotor Under Cap Spins:
Counter
Clockwise
(*307 rotates Clockwise)
These graphics courtesy of Boxwrench.com
-
Pontiac Engine Specs
Pontiac Engine Torque Specs
Bolts or Parts Lube or Sealer Torque to: Main Caps
Engine Oil 95 ft-lbs. Rear Main Cap
Engine Oil 120 ft-lbs.
Warning!!! If you are using ARP bolts, you must use
their specs.Connecting Rod Bolts Assembly Lube 45 ft-lbs. SD Connecting Rod Bolts Assembly Lube 65 ft-lbs. Cylinder Heads
Engine oil
Cast Iron-95 ft-lbs.
Alum. w/Bolts-100 ft-lbs.
Alum. w/Studs-110 ft-lbs.
Rocker Studs (screw-in) Engine Oil 55 ft-lbs. Rocker Arm Nuts
(Non-Adjustable Rockers)
Assembly Lube 20 ft-lbs. Oil Pump Bolts Engine Oil 30 ft-lbs. Oil Pump Cover Bolts Engine Oil 15 ft-lbs. Windage Tray Engine Oil 15 ft-lbs. Oil Pan Engine Oil 12 ft-lbs. Camshaft Thrust Plate Engine Oil 15 ft-lbs. Cam Sprocket/Timing Gear
(upper)
Thread Locker 45 ft-lbs. Timing Cover to Block Engine Oil 35 ft-lbs. Water Pump to Cover Engine Oil Single Timing Cover to
Intake bolt
Install rubber o-ring with light RTV silcone 10 ft-lbs. Valley Pan Bolts Engine Oil 15 ft-lbs. Intake Manifold
(Cast Iron Heads)Intake Manifold
(Aluminum Heads)Non- Hardening Sealer 40 ft-lbs.
25 ft-lbs.
Valve Cover Engine Oil 8 ft-lbs. Exhaust Manifold Anti-Seize Lubricant 30 ft-lbs. Spark Plugs No Lube or Sealer 20 ft-lbs. Flexplate (Automatic)
Flywheel (Clutch)
Thread Locker 95 ft-lbs. Clutch Pressure Plate Thread Locker 25 ft-lbs. Centerbolt
(Harmonic Damper)
Thread Locker 160 ft-lbs. Bellhousing
(Transmission to Block)
Engine Oil 40 ft-lbs. PONTIAC ENGINE CHART ENGINE BORE STROKE MAIN DIA. 326 CU. IN. Stock Bore 3.720 3.750 3.00 30 over 3.750 60 over 3.780 350 CU. IN. Stock Bore 3.875 3.750 3.00 30 over 3.905 60 over 3.935 389 CU. IN. Stock Bore 4.062 3.750 3.00 30 over 4.092 60 over 4.122 400 CU. IN. Stock Bore 4.120 3.750 3.00 30 over 4.150 60 over 4.180 421 CU. IN. Stock Bore 4.093 4.000 3.25 30 over 4.123 60 over 4.153 428 CU. IN. Stock Bore 4.120 4.000 3.25 30 over 4.150 60 over 4.180 455 CU. IN. Stock Bore 4.151 4.210 3.25 30 over 4.181 60 over 4.211 BPI ASSEMBLIES/ENGINES CU. IN. BORE STROKE MAIN DIA. 461 CU. IN. BPI 4.155 4.250 3.00/3.250 467 CU. IN. BPI 4.181 4.250 3.00/3.250 474 CU. IN. BPI 4.211 4.250 3.00/3.250 496 CU. IN. BPI 4.310 4.250 3.00 505 CU. IN. BPI 4.350 4.250 3.00 511 CU. IN. BPI 4.375 4.250 3.00 487 CU. IN. BPI 4.155 4.500 3.00/3.250 494 CU. IN. BPI 4.181 4.500 3.00/3.250 501 CU. IN. BPI 4.211 4.500 3.00/3.250 525 CU. IN. BPI 4.310 4.500 3.00 535 CU. IN. BPI 4.350 4.500 3.00 541 CU. IN. BPI 4.375 4.500 3.00 - Pontiac Cars (Body Types)
-
Pontiac Blocks Cu.In. Chart
Pontiac Cu.In. Chart
326 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 3.720 326 348 370 +.030 3.750 331 353 376 +.040 3.760 333 355 378 +.050 3.770 335 357 380 +.060 3.780 337 359 382 350 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 3.875 354 377 401 +.030 3.905 359 383 407 +.040 3.915 361 385 409 +.050 3.925 363 387 411 +.060 3.935 365 389 413 389 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 4.062 389 415 441 467 +.030 4.092 395 421 447 473 +.040 4.102 396 423 449 476 +.050 4.112 398 425 452 478 +.060 4.122 400 427 454 480 400 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 4.120 400 427 449 453 480 +.030 4.150 406 433 456 460 487 +.035 4.155 407 434 457 461 488 +.040 4.160 408 435 458 462 489 +.050 4.170 410 437 460 464 492 +.060 4.180 412 439 462 467 494 +.065 4.185 413 440 463 468 495 421 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 4.093 421 443 447 474 +.030 4.123 427 450 454 481 +.035 4.128 428 451 455 482 +.040 4.133 429 452 456 483 +.050 4.143 431 454 458 485 +.060 4.153 433 456 461 488 +.065 4.158 435 457 462 489 428 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 4.120 427 449 453 480 +.030 4.150 433 456 460 487 +.035 4.155 434 457 461 488 +.040 4.160 435 458 462 489 +.050 4.170 437 460 464 492 +.060 4.180 439 462 467 494 +.065 4.185 440 463 468 495 455 Block Stroke Bore 3.75 4.00 4.21 4.25 4.50 Stock 4.151 456 460 487 +.030 4.181 462 467 494 +.035 4.186 464 468 495 +.040 4.191 465 469 497 +.050 4.201 467 471 499 +.060 4.211 469 474 501 +.065 4.216 470 475 503 -
Pontiac Block Casting Information
Pontiac Blocks Casting Information
1955-1963
Blocks up to 1963 have side of block casting numbers Up to 1963 have stud oiled heads Year CU IN Casting # 1955 287 518037 1956 316 521560 1957 347 523293 1958 370 528456 1959 389 532000 1960 389 536387 1961 389 538181 1961 421 538181 1962 389 538181 1962 389 542426 (SR) 1962 421 538181, 548913 (late) 1963 326 538211 1963 389 543680 1963 421 544988 1964-1966
1964 and up now had block mounted starters
Block casting numbers moved to teh side of the distributor pad.
Block codes are were now dated ex. Letter represents month, first digit day, second digit year 9773155 with code J23- October 2nd, 1963 9782611 with code F126- June 12th, 1966 Year CU IN Casting # 1964 326 9773153 1964 389 9773155 1964 421 9773157 1965 326 9778840 1965 389 9778789 1965 421 9778791 1966 326 9778840 1966 389 9778789 1966 421 9778791 (early) 1966 421 9782611 (late) 1967-1969
Beginning in 1967 casting nnumbers moved to the rear of the block just behind cylinder #8
Year CU IN Casting # 1967 326
9786339 1967 400 9786133 1967 428 9786135 1968 350 9790079 1968 400 9790071 1968 400 RA 9792506 1968 428 9792968 1969 350 9790079 1969 400 9790071 1969 400 RA IV 9792506 1969 428 9792968 1969 303 546313 1969 400 RA V 9792968 1969 428 RA V 545887 1970-1977
400 blocks with 557 casting numbers have thin main journals.
Year CU IN Casting # 1970 350
9799916 1970 400 9799914 1970 400 RA III 9799914 4-Bolt 1970 400 RA IV 979991 (5) 4-Bolt 1970 400 RA V 481708 4-Bolt 1970 455 9799140 1971 350 481990 1971 400 481988 1971 455 HO 483677 1971 455 485428 Late HO 1972 350 481990 1972 400 481988 1972 455 485428 1972 366 (485)212 1973 350 488986 1973 400 481988 1973 455 485428 1973 455 SD (490)132 1974 350 488986 1974 400 481988 1974 455 485428 1974 455 SD (490)132 1975 350 488986 Early 1975 350 500810 Late 1975 400 481988 Early 1975 400 500557 Late 1975 455 500813 1976 350 500810 1976 400 500557 1976 455 500813 1977 400 568557