Figuring out displacement on a mystery Olds motor

Discussion in 'Oldsmobile Cutlass / 442 / Hurst/Olds' started by Steve Bakken, Jun 9, 2018.

  1. Steve Bakken

    Steve Bakken Not-quite-so-new-guy

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    My son is looking to swap the 260 out of his 78 Calais for something bigger. A hardcore Pontiac friend of mine just bought a '74 Ventura with an Olds motor in it that he wants gone. The seller told him it was a 350. I know in '75 they started putting 260's in them, but this is definitely a '74 and they only used Pontiac 350's that year. So....... anyone know for sure how to determine what size it Is? And yes it is definitely Olds and not Pontiac.
     
  2. fleming442

    fleming442 Comic Book Super Hero

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    You can tell by the casting number between the water pump and China wall, next to the oil fill tube.
     
  3. Steve Bakken

    Steve Bakken Not-quite-so-new-guy

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    If I remember correctly, it's just a series of numbers that need to be decoded. It doesn't actually show the displacement, right?
     
  4. Steve Bakken

    Steve Bakken Not-quite-so-new-guy

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    I have this in the Cutlass forum, but i figured I'd check here, too. My son is looking to swap the 260 out of his 78 Calais for something bigger. A hardcore Pontiac friend of mine just bought a '74 Ventura with an Olds motor in it that he wants gone. The seller told him it was a 350. I know in '75 they started putting 260's in them, but this is definitely a '74 and they only used Pontiac 350's that year. So....... anyone know for sure how to determine what size it Is? And yes it is definitely Olds and not Pontiac.
     
  5. High Roller

    High Roller Greasemonkey

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    does it have the typical oil filler tube? if so what are the block casting # on block next to the filler tube? what # is on cylinder heads next to the #1 spark plug?
     
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  6. 1bad79

    1bad79 G-Body Guru

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  7. Steve Bakken

    Steve Bakken Not-quite-so-new-guy

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    Yes it has the typical oil fill tube. Not sure about the castings. The car is at his place yet. Won't be back over there til tomorrow eve. Trying to get my ducks all in a row before going back over there. Don't wanna go through all the hassle of trailoring it home tomorrow if it just has another 260 in it. The other no.s are just part #'s that will need to be deciphered, correct?
     
  8. Steve Bakken

    Steve Bakken Not-quite-so-new-guy

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  9. High Roller

    High Roller Greasemonkey

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    olds casting.jpg olds head.png
     
  10. fleming442

    fleming442 Comic Book Super Hero

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