500ci Identification. Casting #'s, etc.
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500, 472, 425, 368 Discussion, 500ci Identification. Casting #'s, etc. in Cadillac Engine Technical Discussion; Hi everybody, I'm new to Cadillacs, but no stranger to cars in general. I'm really liking everything I read about ...
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    GryphonGTR500's Avatar
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    Question 500ci Identification. Casting #'s, etc.

    Hi everybody,

    I'm new to Cadillacs, but no stranger to cars in general. I'm really liking everything I read about the big-block Cadillac, especially the 500. My local pick-n-pull says they have a couple kicking around, but I want to make sure I don't get burned and end up with a 425 or worse, a 368. A 472 wouldn't be the end of the world, but I really want the 500.

    Basically the title says it all. I searched for casting numbers and read the sticky posts, but couldn't find anything. Obviously, if it's coming out of a 70-76 eldo, it has to be a 500, right? I'm looking to get the whole engine and TH425 FWD tranny to swap into a mid-engined, rear drive hotrod. Any info is greatly appreciated.

    Cheers,
    Tyler

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    The Ape Man's Avatar
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    Re: 500ci Identification. Casting #'s, etc.

    A factory 500 will always be painted Royal Blue. Best way to tell is to remove a sparkplug (or a bunch of plugs) and carefully measure the stroke using a chopstick or something similar. Get an ass istant to turn the engine over by hand while you mark the high and low spots using a reference point on the chopstick. It isn't easy to turn one of these over by hand and there will not be a crankshaft damper bolt as it's pressed on so this is the hard part. The job seperates the weak from the strong. Best way is to grab the PS fan belt and pull it along while pushing the slack side. Waiting for compression to leak down helps make this job easier. I hope this makes sense. While you have a plug out, take a look at the piston top with a flashlight. You will see either a giant dish or a flat top with a slight circle depression. The dished piston engines used a much smaller head chamber volume. I like the flat top engines better. They seem easier to tune without pre ignition.
    Take your ass istant out for Chineese food after you do this.

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    Thread Starter

    Re: 500ci Identification. Casting #'s, etc.

    Thanks Ape,


    I'll get a piece of dowel and do that. If it's 4.3" I'm golden. The flat top piston motors I'm assuming are the ones that came with the 120cc heads, right? I'm thinking that's what they will have at the yard anyhow. The older 500's with the high compression and 76cc heads are probably way harder to find and more expensive. Everybody wants the pre-smog motors. I've seen what kind of damage an 8.5:1 500 can do to tires . I think I'll have plenty of fun with it.

    Cheers,
    Tyler

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    The Ape Man's Avatar
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    Re: 500ci Identification. Casting #'s, etc.

    You want to avoid using anyhting that might scratch the piston which is why I suggested wood.
    The only year 500 with high compression was 1970. They had the same cc heads with dished pistons after that until going to the "flat top" pistons.
    Have fun.

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