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Thread: 454 Casting Number!

  1. #1
    atxwrangler
    O.k.,i Am Trying To Find Out Some Info On An Engine That Just Came In A 79 Southwind Mini Day Cruiser. I Have Searched,but,not Found The Following 454 Casting Number.,,3889289,9-m10-t,b21-74.any Insight Would Be Appreciated,thanx!

  2. #2
    Senior Member
    Join Date
    Feb 2009
    Location
    Northern Illinois
    Posts
    1,090
    Marty your numbers don't show up on MORTEC (http://www.mortec.com/bbc.htm)
    Good luck Sleek

  3. #3
    Senior Member
    Join Date
    Feb 2009
    Location
    Northern Illinois
    Posts
    1,090
    Could this be your number? 3999289....454.......71-79...2 or 4 bolt, some "CE" replacement blocks had four bolt main cap
    Sleek

  4. #4
    BadKachina
    I think your 8's are 9's. That would give you a 2 bolt main 454.
    Chevy Big Block Engine Block Codes (ALL)
    Casting Years CID Main Comment
    340220 1972-76 427 tall truck
    345014 1974-86 454 truck
    346236 1974-76 454 2 Chevelle, Monte Carlo
    359070 1974-90 454 truck
    361959 1973-85 454 car & truck
    364776 1968-84 427 tall truck
    364779 1968-88 366 tall truck
    473478 1968-84 427 tall truck
    1401544 1975-87 454 truck
    3782870 1968-76 427 tall truck
    3855061 1966-67 396
    3855961 1966-67 396 2 passenger, chevelle
    3855962 1965-66 396 4 passenger, Chevelle, Z16, Corvette
    3855977 1965-67 366 tall truck
    3866961 1966-69 396 Chevy, Chevy truck
    3869942 1966-67 427 2/4 corvette, passenger
    3873858 1966 396 4
    3902406 1967 396 2/4 Camaro, Chevelle
    3902466 1965-67 396
    3904351 1967 427 2/4 385, 390, 400, 425, 430, 435, corvette
    3904354 1966-67 366 tall truck
    3916319 1968-85 366 tall truck
    3916321 1968 427 2/4 385, 390, 400, 425, 430, 435, corvette
    3916323 1968 396 2/4 camaro, chevy II, chevelle
    3918319 1966-70 366 Chevy truck, GMC, tall truck
    3925521 1968-85 366 tall truck
    3928319 1969-73 366 GMC, tall truck
    3935439 1968-69 427 2/4 335, 390, 400, 425, 430, 435, Corvette
    3935440 1968-69 396 2/4 Chevelle, Camaro, Nova
    3937724 1968-85 366 tall truck
    3937726 1968-84 427 tall truck
    3946052 1969 427 4 ZL-1, aluminum, Camaro, Corvette
    3955270 1969 427 2/4 335, 390, 400, 425, 430, 435 Corvette, passenger
    3955272 1969 396/402 2/4 Camaro, Chevelle, Chevy II, passenger
    3955274 1968-85 366 tall truck
    3955276 1968-84 427 tall truck
    3963512 1969-71 427 2/4 335, 390, 400, 425 COPO, 430, 435, Camaro, Corvette
    3963512 1969-72 454 2/4 345, 360, 365, 390, 425, 450, Chevelle, Corvette, Monte Carlo
    3963513 1973-76 454
    3965440 1968-69 396
    3965449 1968-72 396
    3965540 1968 396
    3969854 1969-72 396/402 2/4 240, 265, 300, 325, 330, 350, 375, Camaro, Chevelle, Chevy II
    3969854 1969-73 454 2/4
    3969858 1968-84 427 tall truck
    3999289 1972-78 454 2 Chevelle, Corvette, Monte Carlo, truck
    3999290 1972 402 2 Chevelle, Camaro
    3999293 1968-85 366 tall truck
    3999294 1968-84 427 tall truck
    6272176 1968-76 366 Chevy, GMC, tall truck
    6272177 1972 402
    6272181 1973-76 427 tall truck
    3755011 1959-61 348 2 250, 280, 305, 320, 335
    3771705 1959-61 348 2 250, 280, 305, 320, 340, 350, 2-bolt
    3788068 1962-63? 409 2 340, 380, 400, 409, 425, 2-bolt
    3795623 1961 409 2 360, 2-bolt Impala SS
    3798962 1961 348 2 250, 280, 305, 340, 350, 2-bolt
    3830814 1963-64 409/427 2 340, 400, 425, 427ci-430hp, 2-bolt
    3844422 1963?-64 409 2 340, 400, 425, 2-bolt
    3857656 1965 409 2 340, 400, 2-bolt
    353049 1973 454 corvette

  5. #5
    BadKachina
    Sleek found it at the same time.

  6. #6
    atxwrangler
    well, it was dark! i will investigate more tomorrow,i will also pull the valve covers and check the numbers on them.thanx,guys, i was wondering if i hadn't made that mistake myself,but,i reassured myself that i couldn't have read 2 numbers wrong!L.O.L.

  7. #7
    atxwrangler
    i checked again, the number was 399289,for the block!the heads were336781 stamped pass. also had gm 9t, andc 21-74 stamped in them!

  8. #8
    SmokinLowriderSS
    Those should be sweet heads in good condition.
    From Mortec:
    336781.....73-85...oval...OPEN...454, 118cc chamber, 256/114cc ports
    Large oval ports, open chambers, good performance head for a mid-range RPM motor (like a boat motor). I have a set of 049's with very similar specs (same basically). A local racing shop here in my city says they respond VERY well to their stage-1 porting (no, Hi-tech doesn't port heads) to the tune of 70 to 80 HP typically. You probably have the small valve sizes (2.06"I/1.73"E). Congrats on a nice motor it looks like.

  9. #9
    atxwrangler
    thanx, smokin!i will keep and use them then.i was under the impression that i needed rectangle ports for horsepower!

  10. #10
    SmokinLowriderSS
    IMO on a 4k to 6kRPM engine you are better off with the large ovals. the huge rectangle ports are great above 6k but the airflow velocity is so low at mid revs that the engine literally starves trying to inhale thru tubes way too big, fuel dropout & puddling happens. Hurts Torque production a lot, thus hurts HP production till the RPM's climb enough for the engine to use those big ports. For most boat engines, you'll never rev that high.

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