olds engine related , useful info

Discussion in 'general muscle car related info' started by Grumpy, Apr 14, 2019.

  1. Grumpy

    Grumpy The Grumpy Grease Monkey mechanical engineer. Staff Member









    https://oldsjunction.classicoldsmobile.com/oldsfaq/ofblk.htm

    https://oldsjunction.classicoldsmobile.com/oldsfaq/ofhed.htm

    http://wildaboutcarsonline.com/cgi-...itemid=9990378649894&categoryid=9970399476565

    http://wildaboutcarsonline.com/cgi-bin/pub9990262549620.cgi?itemid=9990371596524

    https://oldsjunction.classicoldsmobile.com/oldsfaq/ofinm.htm

    http://www.v8volvo.se/mekartips/identifiering/oldsmobile/gjutnummer-block.html

    http://garage.grumpysperformance.com/index.php?threads/looking-for-oldsmobile-id-info.11777/
    OLDSMOBILE BLOCK CASTING NUMBERS

    Blocks 1949 - 1964
    The casting number is located at the rear of the bell housing.
    The number are about ¾" high, and oriented to the right (passenger) side.

    YEAR SIZE CASTING NOTES
    '49 - '53 303 555614 Green
    '49 - '?? 303 555641 Green
    '54 - '56 324 568922 Green
    568928
    '57 - '58 371
    '59 - '60 371 Gold
    394 Green
    '60 394 578135-4 1/8
    '61 - '63 371 Gold
    394 Lo comp: Green, Hi Comp: Red
    '64 394 585786 This specific casting number seen on
    an "Ultra-High Compression" engine.
    The number "4 1/8" follows casting number.
    Small Block Blocks 1964 - 1990
    Facing the front of the engine, at the top surface of the timing chain area, to the left
    of the oil fill tube, there is a code about 1.5" high followed by the casting number.
    A letter indicates a big block, a number indicates a small block.
    A small block measures 12" between the heads at the manifold base.

    CODE YEAR SIZE CASTING NOTES
    1
    1A '64-'66 330 381917 45° cam bank angle.
    2 '68-'76 350 381917
    2 '68-'70 350 395558
    3 '66-'67 330 394417 39° cam bank angle.
    4
    5 '73,'74 350 395558
    2A '75-'81 260 Solid main webs for 2A's only? At least for '76.
    2B '??-'81 260 557751 Windowed main webs. Windowed main webs for 2B's only?
    3A '79 350
    3B '77-'80 350 557752
    4A '77 403 557265
    553990
    554990 Solid main webs possibly
    for these three
    casting numbers.
    4B '77-'79 403 557265 Windowed main webs always.
    ?? '85 307 556607
    5A '81- 307 3161
    D3 350 7582 Diesel
    Big Block Blocks 1965 - 1976
    Facing the front of the engine, at the top surface of the timing chain area,
    to the left of the oil fill tube, there is a code about 1.5" high followed by the casting number.
    A letter indicates a big block, a number indicates a small block.
    A big block measures 14" between the heads at the manifold base.

    CODE YEAR SIZE CASTING NOTES
    A '65 425 381917??
    386525 1st year, big cars.
    B '65 400 389298 442 only, one year only.
    D '66 - '67 425 389244 Big-car engine.
    Toro is different internally.
    E '66 - '67 400 390925 442 engine [VERY rare].
    F '68 - '70 455 396021 Common big block.
    Stick type F (sans serif).
    F '70 - '72 455 396021 Common big block.
    Serif type F.
    Two vertical and a base serif.
    Fa '72 - '76 455 396021 Very common big block.
    Marine also (L VIN derivative).
    G '68 - '69 400 396026 442/Vista/etc. engine.
    L '76 455 231788 Motorhome, marine and irrigation.
    GM made motorhomes from '73-8,
    maybe in all?
    Casting number appears as "231
    [tiny 'L'] 788" on the block.

    Tillbaka
     
    Maniacmechanic1 likes this.
  2. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    The Olds V8 Oil restrictors are iffy to me Grumpy.
    Bearing shell mods I have done prior.

    Done way different Pontiac V8.

    Left The Olds 425 near stock.
    Fantastic like I was told years back.
     
  3. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    Olds had special lifters new.
    Limit oil to top end.

    I see them GM NOS for sale at times.
    They sell for a small mint.
     
  4. Maniacmechanic1

    Maniacmechanic1 solid fixture here in the forum

    I was thinking of the Elbow crook return holes on 1964 & Up Olds V8.
    It's actually 2 steps 2 tangent angles.
    It's because the Olds V8 has 6 degree valve inclination cylinder heads.
    Recall guys drilling out to 1/2 " inch the oil return holes.
    Never been issue for me.

    Pontiac V8 has generous cylinder head oil return passages. Non issue.
     

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