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Intake Manifold Casting Numbers (Group 3.265)

 

These intake manifold castings were used in various other models of the Chevrolet lineup such as the passenger car, Chevy II/Nova, Camaro and Corvette. Only Chevelle-specific information is listed here to conserve space. Some casting numbers are NOT listed as they may have been used in other models of the Chevrolet lineup but were NOT used in the Chevelle.

 

The casting number is probably the most significant feature on an intake manifold. The casting date is usually found near the casting number.

Intake manifolds are normally date coded in the form of a letter for the month (see table below), two numbers for the day and a single number for the year.  For example, C259 indicates a date of March 25, 1969.

 

It's important to remember the 'to' and 'from' dates listed may vary due to production lead time and stock inventories being depleted. For example just because a particular intake casting may be listed as being used in 1964 doesn't imply that the engine assembly plants discarded all pre-1964 intakes or immediately after the model production year discard all intakes they had in inventory to begin using the newer design.

 

V8 Intake Manifold Casting Month Codes
A - January B - February C - March D - April
E - May F - June G - July H - August
I - September J - October K - November L - December

Caveats to production dates. Due to inventories, shipping schedules, etc. it is entirely possible that intake manifolds being phased out of production may still appear on Chevelles built after that time.

Manifold
Number		 Year Engine Horsepower Notes
3844461 1964
1965		 327
327		 350
350		 Aluminum with Holley 4-bbl. Riveted oil splash shield.
3840905 1964
1965		 283
283		 195
195		 Cast iron with Rochester 2-bbl. Riveted oil splash shield.
3844457 1964 283
327		 220
250		 Cast iron with Carter WCFB or Rochester carburetor. Riveted oil splash shield.
3844459 1964
1965		 327
327		 300
300		 Cast iron with Carter AFB. Riveted oil splash shield.
3866963 1965 396 375 Aluminum with Holley 4-bbl. No oil splash shield.
3866922 1965 283
327		 220
250		 Cast iron with Carter or Rochester 4-bbl.
3856289 1966 396 325 w/A.I.R. Cast iron with Rochester and A.I.R.
3866948 1966
1966
1967		 396
396
396		 325 w/o A.I.R.
360
350		 Cast iron with Holley 4-bbl. No oil splash shield. "Holley" cast into top of manifold.
3872783 1966 327 275 w/o A.I.R. Cast iron with Holley 4-bbl.
3875954 1966 327 275 w/A.I.R. Cast iron with Rochester 4-bbl.
3877652 1966 283 195 Cast iron with Rochester 2-bbl.
3882858 1966 283 220 Cast iron all 4-bbl. Used extensively as service replacement.
3883948 1966
1967
1968		 396
396
396		 325 w/A.I.R.
325
325, 350		 Cast iron with Rochester 4-bbl. No oil splash shield
3885069 1966
1967
1968		 396
396
396		 375
375
375		 Aluminum with Holley 4-bbl
Three designs, a 3-hole closed plenum, a 2-hole closed plenum and an open plenum. The 3-hole was used from August of 1965 through June of 1967. The 2-hole plenum was used for the 1968 model year and the open plenum was used on Corvette only. No oil splash shield. First with divorced choke design.
3890490 1966
1967		 327
327		 350
325		 Aluminum with Holley 4-bbl. Chevrolet does report any 327/350 engines installed in 1966 Chevelles.
3905393 1967 327 275 Cast iron with Rochester 4-bbl.
3919878 1967
1968		 396
396		 375
375		 Aluminum with Holley 4-bbl. Unverified if OE installed from late 1967 through early 1968. This manifold may have been used extensively as a service replacement. No oil splash shield
3919801 1968 307 200 Cast iron with Rochester 2-bbl. Riveted oil splash shield.
3919803 1968 327 250, 275, 325 Cast iron with Rochester 4-bbl. Riveted oil splash shield. Temperature sending hole is plugged
3916313 1969
1970		 350
350		 250
250		 Cast iron with Rochester 2-bbl. No oil splash shield.
3933163 1969 396 375 Aluminum with Holley 4-bbl. Possible late 1968 application. Identical to #3885069 except addition of heater outlet boss on upper right thermostat passage. No oil splash shield.
3927183 1969
1970		 307
307		 200
200		 Cast iron with Rochester 2-bbl. Oil fill tube and water by-pass boss eliminated. Heater nipple boss drilled and tapped on right thermostat passage.
3927184 1969 350 255, 300 Cast iron with Rochester 4-bbl.
3931067 1969 396 325, 350 Cast iron with Rochester 4-bbl. Heater nipple boss drilled and tapped on right thermostat passage.
3963569 1970 402
454		 375
450		 Aluminum with Holley 4-bbl. Low rise intake. Riveted oil splash shield.
3955287 1970
1971		 402, 454
402, 454		 330, 350, 360
300, 365		 Cast iron with Rochester 4-bbl. Low rise intake. No oil splash shield.
3965577 1970 350 300 Cast iron with Rochester 4-bbl.  Oil splash shield.
3973465 1971 307 200 Cast iron with Rochester 2-bbl. Heater outlet boss on upper right thermostat passage. Oil splash shield.
3973467 1971 350 245 Cast iron with Rochester 2-bbl. Heater outlet boss on upper right thermostat passage. Oil tube boss eliminated. Oil splash shield.
3973469 1971 350 270 Cast iron with Rochester 4-bbl. Heater outlet boss on upper right thermostat passage. Oil splash shield.
6262936 1972 307 130 Cast iron with Rochester 2-bbl. Heater outlet boss on upper right thermostat passage. Oil tube boss eliminated. Oil splash shield. Intake runners have numbers cast for their port.
6263751 1972 350 175 Cast iron with Rochester 4-bbl. Heater outlet boss on upper right thermostat passage. Oil tube boss eliminated. Oil splash shield. Intake runners have numbers cast for their port.
6263752 1972 350 165 Cast iron with Rochester 2-bbl. Heater outlet boss on upper right thermostat passage. Oil tube boss eliminated. Oil splash shield. Two accessory bosses between #5 and #5 runners.
6263753 1972 402, 454 240, 270 Cast iron with Rochester 4-bbl. Intake runners have numbers cast for their port. No oil splash shield.

 

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Always seems to be exceptions to the rules. This casting #3955287 intake has numbered runners and oil splash shield - neither of which it was supposed to have.