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Round or Square Port Heads?

Discussion in 'The Garage' started by ARAMP1, Oct 6, 2006.

  1. ARAMP1

    ARAMP1 Aviator Extraordinaire

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    I've got a 1990 TBI 454. I belive it's a Mark iv engine. I'm going to guess that the intake ports are round, but can someone confirm? I'd like to order some things without having it all apart while I'm waiting on parts. I guess if all else fails, I can just go to autozone and pick up a set of intake gaskets, which I'll need anyway.
     
  2. DEMON44

    DEMON44 Low-Tech Redneck

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    ge the head casting #s and reference it. or I can.
     
  3. DEMON44

    DEMON44 Low-Tech Redneck

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    well I can only see up to '85 anyways, but with the square ports being last produced in '71 I would assume round port, but I don't know where the peanut port falls in to.
     
  4. Jimbo*

    Jimbo* 1/2 ton status

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    They should be the small round(peanut) ports, unless they have been changed.
    Jimbo
     
  5. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    +1 :thumb:
     
  6. 54inches

    54inches 1/2 ton status

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    There was also a non-peanut oval port that year as well....

    go to moretec.com or hotrodgossip.com and they have a list of casting and engine specs.....
     
  7. 54inches

    54inches 1/2 ton status

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    Here ya go.......I erased all the non-454 BB stuff.



    345014.....454.......70-86...
    346236.....454.......75-76...2-bolt
    359070.....454.......70-90...
    361959.....454.......73-90...2 or 4 bolt


    3963512....454.......70-76...2 or 4 bolt

    3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main caps

    10051107...454...............4-bolt, Bowtie, MkIV, 9.8" deck, siamesed cylinder barrels, 4.25" semi-finished bores, can be bored to 4.50"
    10069282...366T......90-91...4-bolt, Mark IV, Tall deck
    10069286...454.......90-91...4-bolt, Mark IV, Short deck
    10114182...454.......91-up...4-bolt, Gen.V


    10134366...454T..............4-bolt, Bowtie, Gen.V, Tall deck
    10185050...454...............4-bolt, Bowtie, Gen.V, Short deck
    10237297...454.......96-up...4-bolt, Vortec 7400", "L-29" Gen.VI

    12550313...454.......91-up...4-bolt, Gen.V crate motor, Gen. VI 4.25" bare block, fuel pump boss
    12561357...454.......96-up...4-bolt, Gen.VI

    14015443...454.......87-90...2 or 4-bolt, Mark IV, Truck, Motorhome
    14015445...454.......78-90...2 or 4 bolt
    14044807...454T..............4-bolt, Bowtie, MkIV, CNC prep, Tall deck, 4.25" bore or 4.495" bores

    24502504...454...............4-bolt, Bowtie, Gen.V, Race prep, 9.8 "short" deck height
    24502506...454T..............4-bolt, Bowtie, Gen.V, Race prep, 10.2 "tall" deck height
    24502572.....................4-bolt, 4.5" bore Olds DRCE 2, 9.5" deck height
    25534402.....................4-bolt, 4.590" bore Olds DRCE 3, 9.25" deck height



    T = Tall deck, 10.2" deck height


    1991 and later Gen.V, VI and VII production BBC motors have one-piece rear main crank seals.
     
  8. 54inches

    54inches 1/2 ton status

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    Here's the head castings......


    330864.....68-84...oval...OPEN...396, 402, 366T,
    427T, 454 Truck
    330865.....68-84...oval...OPEN...396, 402, 366T,
    427T, 454 Truck
    330866.....68-78...oval...OPEN...366T, 427T
    330867.....68-73...oval...OPEN...427T
    336765.....68-78...oval...OPEN...427T
    336768.....73-76...oval...OPEN...427T
    336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports
    343771.....68-86...oval...OPEN...366T, 427T, 454
    343772.....68-86...oval...OPEN...366T, 427T, 454
    343783.....70-76...oval...OPEN...454 Truck
    346236.....75-87...oval...OPEN...454, 120cc chamber, 225/116cc ports
    352625.....70-76...oval...OPEN...454 Truck
    353049.....73-84...oval...OPEN...454, 122cc chamber, 255/119cc ports
    366765.....74-78...oval...OPEN...427T
    473328.....68-69...oval...OPEN...366T
    3856206....65-66...oval..CLOSED..396, 97cc chamber
    3856208....65......rect..CLOSED..396/425hp, 109cc chamber
    396/375hp "Z-16" Chevelle
    3856213....66-82...oval..CLOSED..366T, 427T
    3856260....68......oval..CLOSED..396 Truck
    3872702....65-66...oval..CLOSED..396, 427, 98cc chamber
    3873858....65-67...rect..CLOSED..396, 427, 109cc chamber
    3876875....77-85...oval...OPEN...427T
    3904390....67......oval..CLOSED..396, 427, 98cc chamber
    3904391....67......rect..CLOSED..396, 427, 107cc chamber
    3904392....67......rect..CLOSED..427, Aluminum, L88, L89, 107cc chamber
    3904393....68-76...oval...OPEN...366T
    3908952....67......oval...OPEN...427, "M.Truck", Marine
    3909802....67......oval..CLOSED..396, 427, 101cc chamber
    3917215....67-68...oval..CLOSED..396, 427, 101cc chamber
    3917219....68-85...oval...OPEN...366T, 427T
    3919840....67-69...rect..CLOSED..396, 427, 107cc chamber
    3919842....68-69...rect..CLOSED..396, 427, Aluminum L88, L89, 107cc chamber
    3931063....68-69...oval..CLOSED..396, 402, 427, 101cc chamber
    3933148....69-84...oval...OPEN...'69 396/265hp, 366T, 427T, 112cc chamber
    3933149....68-76...oval...OPEN...427T, 122cc chamber
    3935401....68-76...oval...OPEN...427T
    3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
    '71 454 LS6, "round exhaust port"
    3964290....69-70...oval..CLOSED..396, 402, 427, 454, 101cc chamber
    Large or small hex spark
    plugs used
    3964291....69-72...rect..CLOSED..396, 402, 427, 454, 109cc chamber, Large or small hex spark plugs used, crate motor usage in years after 1970.
    3965198....68-69...oval..CLOSED..396 Truck
    3975950....68-70...oval...OPEN...396, 402 Truck, 366T, 427T
    3986133....68-85...oval...OPEN...366T, 427T, 454 Truck
    3986135....69-73...oval...OPEN...366T, 427T
    3986136....68-84...oval...OPEN...366T, 427T, 454 Truck
    3993820....71......oval...OPEN...402, 113cc chamber, 255/114 ports
    3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, 255/114 ports
    3994026....71......rect...OPEN...454 LS6, 118cc chamber
    3999241....72......oval...OPEN...402, 454, 113cc chamber

    6272292....70-78...oval...OPEN...402, 454
    6272990....70-up...rect...OPEN...454 service replacement, used on some MKIV crate engines, 118cc chamber
    10045427...........rect..........Pontiac/Chevy Aluminum, 91cc chamber
    Large Port, race
    10049875...........rect..........Pontiac/Chevy Aluminum
    Small port, race
    10051128...........rect..........Bowtie, Aluminum 72cc chambers
    Symmetrical ports
    10051129...........rect..........Bowtie, Aluminum "raw"
    casting, Symmetrical ports
    10052902...........oval...OPEN...MkIV, 427T
    10101140...91-up...oval..CLOSED..Gen.V 366T, 427T
    10114156...91-up...oval...OPEN...Gen.V & VI 454, 118cc chamber
    10141279...96-up...oval..CLOSED.."Vortec 7400", 100cc chambers
    10487052...77-90...oval...OPEN...366T
    12363391...96-up...oval...OPEN...Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI, 110cc chamber
    12363401...96-up...rect...OPEN...Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI, 118cc chamber
    12558162...01-up...oval..CLOSED..Gen.VII,"Vortec 8100", 8.1L, 496, truck
    12560241...98-up...oval..CLOSED.."Vortec 7400", 100cc chambers
    12562932...91-95...oval...OPEN...Gen.V, truck crate motor, 118cc chambers
    12562933...91-95...oval...OPEN...Gen.V, 118cc chambers
    12562934...00-up...rect...OPEN...Gen.VI 502 Marine
    14011077...69-up...rect...OPEN...Aluminum, fits MKIV, "C-port"
    118cc chamber, also sold as a "solid" head
    14044861...84-96...rect..........Bowtie, Aluminum, MkIV,
    "raised runners", 1st design, 105cc chamber
    14044861...96-up...rect..........Bowtie, Aluminum, Signature
    Series, fits MKIV, Gen.V, Gen.VI
    "raised runners", 2nd design, 115cc chamber
    14044861...84-96...rect..........Bowtie, Aluminum, MkIV
    "raw" casting of "861" MKIV
    1st design
    14081045...78-87...oval...OPEN...454
    14081052...85-87...oval...OPEN...366T, 427T, 454 Truck, Marked "HiPerf"
    14092359...86-90...oval...OPEN...366T, 427T, Marked "HiPerf"
    14092360...86-90...oval...OPEN...454 Truck, "peanut" round ports

    14096188...70-71...rect...OPEN...454 service replacement, also used on later Mark IV LS-6, LS-7 and 454 HO crate motors, 116cc chamber
    14097088...91-up...rect...OPEN...Gen.V 454/502 HO, 118cc chamber
    24502585...97......rect..........Olds/Chevy, DRCE 2,
    Pro Stock aluminum, for blocks w/4.900" bore spacing
    25534404...04......rect..........Olds/Chevy, DRCE 3, Pro Stock, aluminum, for blocks with 4.900" bore spacing

    T = Tall deck

    Oval includes both "peanut" (also called "round") ports and large oval ports
     
  9. k20

    k20 3/4 ton status

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    If they are pretty much round, they are peanuts, otherwise, they are ovals. You can say with 90% certainty on big blocks of that era, they are peanuts.
     

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