Big Block Chevrolet Engine Intake and Exhaust Manifolds Info and Casting Numbers

3963569 Chey Big Block Aluminum 4 Barrel Intake Manifold

Big Block Chevrolet Engine Intake Manifolds

During the many years of production Chevrolet used many different configurations of Cast Iron and Aluminum intake manifold for the Big Block engines. Most standard output Big Blocks came with cast iron spread bore with oval port manifolds. While high-performance engines came with aluminum rectangular port manifolds.

Factory manifolds were available in low or high-rise and with, spread bore, square bore, tri-power, dual quad, and Fuel Injected configurations. Other than different in port type and deck height all Chevy Big Block Cast Iron intake manifolds are interchangeable from the Mark IV to the Gen VI generations of engines.

If you are sourcing a factory intake manifold for your engine you must start by check the port type. There are 3 different intake port configurations and are not interchangeable. Early Big blocks came with either large Oval or Rectangular ports and Later big blocks also came with smaller Oval Port(Peanut Port) heads.

You will also need to consider if you need a choke stove(early production manifolds) or an EGR port(all manifolds from 1973 on). Production high-rise manifolds were only available up to 1970. From 1971 on all production manifolds were of the low-rise type.

All Chevy Big Block intake manifolds have an identifying Casting number. The number is usually located on one of the intake runners. The number will help determine if you have the correct manifold for your application. A date code is also cast on the manifold and is usually next to the Casting Number. This code is needed when authenticating a matching number car or truck. The Date Code begins with a letter that designates the month of production. A = January B= February and so on. The middle numbers designate the date and the Last number the year.

Example: Date Code F208.
F = June,
20 = 20th Day, and
8 = 1968 or 1978.

Note: The Casting code will help determine the exact year the manifold was cast.

If you can’t find an original exhaust manifold many aftermarket reproductions are available.

3931067 Chey Big Block Cast Iron 4 Barrel Spread Bore Intake Manifold

3963569 Chey Big Block Aluminum 4 Barrel Square Bore Intake Manifold

3894374 Chey Big Block Tri-Power Intake Manifold

3814881 Chey Big Block Dual 4 Barrel Intake Manifold

Big Block Chevrolet Intake Port Types

Big Block Chevrolet Engine Intake Manifold Casting Numbers

Casting Number	Years	Engine Size	Carburation	Type	Notes
336789	1974	454	Q-jet	Iron Oval port	235, 270Hp
346242	1975	454	Q-jet	Iron Oval port	215Hp
353015	1973	454	Q-jet	Iron Oval port	215, 245Hp
393841	1973-1975	454	Q-jet	IRON OVAL PORT
393841	1973-1975	454	Q-jet	Iron Oval port	215Hp
3732757	1958-1962	348	4-Brl
3749948	1958-1961	348	Tri-Power
3753748	1960-1961	348	Dual quad	Aluminum
3760436	1958-1959	348	4-Brl
3767579	1961	348/409	4-Brl
3770084	1958-1959	348	4-Brl
3772265	1960-1961	348	4-Brl
3780540	1958-1959	348	4-Brl		Aluminum
3797775	1959-1960	348	4-Brl
3797776	1961	409	4-Brl
3813678	1962-1963	409	4-Brl
3814881	1962-1964	409	Dual quad		Aluminum
3830623	1963	409	Dual quad		Aluminum Z-11
3830831	1963	409	4-Brl		340HP
3844463	1964-1965	409	4-Brl		400HP
3844464	1964-1965	409	4-Brl		340HP
3844472	1962-1965	348/409	4-Brl
3856289	1965-1966	396	Q-jet	Oval port	325Hp L-35
3866948	1966-1967	396	Q-jet	Iron Oval port	325, 360Hp L-34/L-35
3866948	1966-1967	427	Holley	Iron Oval port	390Hp
3866963	1965	396	Holley	Aluminum rectangular port	375, 425Hp L-37
3883948	1966-1968	396	Q-jet	Iron Oval port	325Hp L-35
3883948	1966-1968	427	Q-jet	Iron Oval port	385, 390Hp L-36
3885069	1966-68	396	Holley	Aluminum rectangular port	375Hp L-78
3885069	1966-68	427	Holley	Aluminum rectangular port	425Hp L-72
3886093	1967	427	Holley	Aluminum rectangular port	430Hp L-88
3894374	1967	427	Tri-Power	Aluminum rectangular port	435Hp L-71
3894382	1967	427	Tri-Power	Aluminum rectangular port	400Hp L-68
3919849	1968	427	Q-jet	Aluminum rectangular port	390Hp L-36
3919850	1968	427		Aluminum oval port	400Hp L-68
3919852	1968	427	Tri-Power	Aluminum rectangular port	435Hp L-71
3919878	1968	396	Holley	Aluminum rectangular port	375Hp L-78
3919878	1968	427	Holley	Aluminum rectangular port	425Hp L-72
3931067	1969	396	Q-jet	Iron Oval port	325Hp L-35
3931067	1969	427	Q-jet	Iron Oval port	335, 390Hp L-36
3933163	1968-69	396	Holley	Aluminum rectangular port	375Hp L-78/L-89
3933163	1968-69	427	Holley	Aluminum rectangular port	425Hp COPO
3933198	1968-69	427	Holley	Aluminum rectangular port	430Hp L-88/ZL-1
3937793	1968	427	Q-jet	Aluminum rectangular port	390Hp L-36, oval port, Qjet, Late
3937795	1969	427	Tri-Power	Aluminum rectangular port	400Hp L-68
3937797	1969	427	Tri-Power	Aluminum rectangular port	435Hp L-71
3947801	1969	427	Q-jet	Aluminum rectangular port	390Hp L-36
3952900	1969	396	2- Barrel	Oval port	265Hp
3955287	1970-1971	402	Q-jet	Oval port	300, 330, 350Hp LS-3
3955287	1970-1971	454	Q-jet	Oval port	360, 365, 390Hp Ls-5
3963569	1970-1971	396/402	Holley	Aluminum rectangular port	375Hp L-78/L-89
3963569	1970-1971	454	Holley	Aluminum rectangular port	LS-6, low-rise
3963569	1970-1971	396/402/454	Holley	Aluminum rectangular port	Low rise L-78/L-89/LS-6
3967474	1971	454	Holley	Aluminum rectangular port	425Hp
6263753	1972	402/454	Q-jet	Oval port	LS-3/LS-5
6269318	1972	454	Holley	Aluminum rectangular port

Big Block Chevrolet Engine Exhaust Manifolds

Chevrolet used different configurations of Cast Iron exhaust manifold on their Big Block engine. This enabled the engine to be installed on mid-size to full-size cars, trucks, marine, and industrial applications.

All Chevy Big Block Cast Iron exhaust manifolds are interchangeable from the Mark IV to the Gen VI generations of engines. However, clearance issues can arise depending on the chassis or application the engine will be installed in.

All Chevy Big Block engines exhaust manifolds have an identifying Casting number. This number will help find or determine if you have the correct manifold for your application. A date code is also cast on the manifold. This code is helpful when working on the restoration of a matching numbers car or truck.
The Date Code begins with a letter designating the month the manifold was cast. A = January B= February and so on. The middle numbers designate the date and the Last number the year.

Example: Date Code B119

B = February

11 = 11th Day

9 = 1969 or 1979.

Note: the Casting code will help determine the exact year the manifold was cast.

High-performance Big Blocks used manifolds with longer runners. If you’re building a street performance engine and want to use factory manifolds these would be the ones to use.
If you can’t find an original exhaust manifold many aftermarket reproductions are available.

3916178 & 3909879 Chey Big Block LS6 Exhaust Manifold

3969869 & 3880828 Chey Big Block Corvette Exhaust Manifold

Big Block Chevrolet Engine Exhaust Manifold Casting Numbers

Cast Number	Years	Engine Size	Position	Notes
329225	1973-1976	454	Left	Chevelle and Passenger
353028	1973-1976	454	Left	Chevelle and Passenger
353030	1973-1976	454	Left	Police
3732793	1958-1961	348	Left	Passenger
3732794	1958-1961	348	Right	Passenger
3767583	1959-1961	348 & 409	Left	Passenger
3767584	1959-1961	348 & 409	Right	Passenger
3814682	1962-1964	409	Right	Passenger
3814683	1962-1964	409	Left	Passenger
3822925	1962-1964	409	Left	Z-11 & Passenger
3822926	1962-1964	409	Right	Z-11 & Passenger
3855161	1965	409	Left	Passenger Car with 340 & 400 HP
3855162	1965	409	Right	Passenger Car with 340 & 400 HP
3856297	1965	396	Left	325 HP
3856301	1965	396	Left	425 HP Corvette
3856302	1965	396	Right	425 HP Corvette
3856306	1965	396	Right	Passenger Car with 325 HP
3857297	1965	396	Left	Passenger Car with 325 HP
3868874	1965-1966	396	Right	Chevelle with 325, 360 & 375 HP Z-16
3869925	1965	396	Left	Chevelle With 375 HP Z-16
3872770	1966	396	Right
3880827	1966-69	427 & 454	Left	Corvette
3880828	1966-1972	427 & 454	Right	Corvette with 270, 365, 390 & 425 HP LS-5 & LS-6
3880869	1970-1972	454	Left	Corvette with 270, 365, 390 & 425 HP LS-5 & LS-6
3883827	1966	427	Left	Passenger car
3883828	1966	427	Right	Passenger car
3883999	1966	396	Left	Chevelle With 325, 360 & 375 HP
3884504	1966-1967	396 & 427	Right	Passenger With 325, 385 & 390 HP
3892307	1966-1967	396 & 427	Left	Passenger 325 & 390 HP
3902401	1967	396	Left	Chevelle
3904399	1966	396	Left
3909879	1967-1970	396, 427 & 454	Left	Chevelle, Camaro and Nova With 325, 350, 375, 425, 430 & 450 HP LS-6 COPO
3909880	1967	396	Right	Chevelle and Camaro with 325, 350 & 375 HP
3914613	1968-1970	396 & 427	Left	Passenger with 265, 325, 335, 345, 390 & 425 HP
3916178	1968-1970	396, 427 & 454	Right	Chevelle, Camaro, Nova and Passenger cars with 325, 350, 375, 425, 430 & 450 HP COPO LS-5 & LS-6
3969869	1970-1974	454	Left	Corvette with 270, 365 & 390 HP LS-5
3989310	1971-1972	402 & 454	Right	Chevelle, Camaro, Monte Carlo, and Passenger Cars
3989343	1971-1972	402 & 454	Left	Chevelle, Camaro, Monte Carlo, and Passenger Cars
3994045	1973-1975	454	Left	Police

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View Comments

Don Rownd says:

March 31, 2022 at 10:01 am

I noticed on 66 396 360 Hp intake manifold that the one manifold casting number 3866948 was an oval port intake for a Quadrajet carburator and on the next intake down it says that a 396 390 hp is the same number 3866948 . I have a 1966 396 360 HP L 34 4 Spd. that came with a holley intake 3866948 how can this be 2 different manifolds with the same part #