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500, 472, 425, 368 Discussion, MPG-Crate Engine in Cadillac Engine Technical Discussion; What do you think a 500 crate engine would get MPG wise?...
  1. #1
    WWII is offline Cadillac Owners Member
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    MPG-Crate Engine

    What do you think a 500 crate engine would get MPG wise?

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  3. #2
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
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    Re: MPG-Crate Engine

    What vehicle, what rear-end?

    Brian

  4. #3
    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: MPG-Crate Engine

    Stick it in a CRX and you could see 20 city, stick it in a 76 hearse and you'd be lucky to see 10.

  5. #4
    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    Oh yeah. I forgot the vehicle. A 1977 Deville.

  6. #5
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    Re: MPG-Crate Engine

    Assuming all stock including drivetrain and optimum tuning: around town = dismal 10-12 MPG.
    Steady highway 65 MPH = 14-15 MPG. An overdrive would help out.
    Steady highway 55-60 MPH = 17-19 MPG.


    The later flat top piston open chamber head engines were always easier to set spark advance curves on compared to the dished piston engines. Dunno why but have noticed this several times.

  7. #6
    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    It would be all stock. I'm looking to sell my 1977 Coupe that had the engine rebuilt with a new camkit, bored out, new pushrods, valves, etc. and buy another 1977-1979. The only reason is being that there are too many small things I don't want to keep worrying about. Oh, it also had the tranny rebuilt with a shift kit. Anyway, I'm looking to sell it and start all over and drop an engine in it that will get good gas mileage. I remember reading something about a deville that got about 25 mpg with some work done to it. What would it take to get something like that?

  8. #7
    davesdeville's Avatar
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    Re: MPG-Crate Engine

    Realistically... buying a northstar powered Deville.

  9. #8
    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    Quote Originally Posted by davesdeville
    Realistically... buying a northstar powered Deville.
    Or a Honda....but you know how those BIG CAD engines are. Right now I'm getting something along the lines of 13-15 mi. a gallon from my 425. I really just want to start all over and rebuild a 472/500 and drop that in another 1977-79 coupe. I just don't know whether to get one with low compression and use a mild camkit from MTS, or put some 76cc heads on a 500 and get a higher compression and use a little bit beefier cam. I would like to get something along the lines of 18 mpg. Most of my driving is for work (about 30 min. away) and it's almost like highway driving. I stop twice and then hit a small town, but that's it. Just looking for some opinions. Right now I have a 71 sitting with the 472 in it. I was thinking about just pulling that out and using that for the 77-79, and then getting another 472 and making that my "ultimate engine" for the 71. Just wondering what the experts think on here.

    Another thing that I've been wondering about. Is there a place where I can order ALL the hardware for a 472/500 engine? I mean, all the bolts and things like that in a kit or something?

  10. #9
    terrible one's Avatar
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    Re: MPG-Crate Engine

    If you want low compression, the '76 500 had 8.25:1.

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    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    Does low compression give better gas mileage, or does higher compression? It's gonna be a daily driver so I don't want to go higher than 10:1.

  12. #11
    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    Well, the time has come already. I found a good deal on a very CLEAN 1976 Coupe Deville d'Elegance. Oh my god, this thing is sweet. Now I have to sell my 1977 coupe, and possibly the 71 also. Hopefully not the 71. First thing I'm gonna do is put the edelbrock intake on it. Will this swap perfectly or will I have to mess the A/C, carb, etc...?

  13. #12
    davesdeville's Avatar
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    Re: MPG-Crate Engine

    Higher compression gives more power but doesn't burn more fuel/air mix. So I'd assume it giver better mileage. If you want you can look into propane, as it gets a tiny bit worse mileage on a stock engine than gas would, but it's a hell of a lot cheaper. You could also run 76cc heads on a later model 500 and make up for the loss.

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    terrible one's Avatar
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    Re: MPG-Crate Engine

    The stock A/C compressor won't fit on the Edelbrock intake.

  15. #14
    WWII is offline Cadillac Owners Member
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    Re: MPG-Crate Engine

    What year did the 76cc heads come off of?I can't remember. I won't be doing that swap with this car anytime soon though. Doesn't the compression jump from like, 8.25:1 to 12:1? Well, I will do it in the future though to another toy.

    What would I have to do to make my A/C work with the Edelbrock intake? This is going to be my daily driver for awhile and want to do everything I can to get better gas mileage, without tearing apart the engine and for a cheap price. I'll probably go ahead and get a carb and have it rebuilt in the near future. But like I said, I don't want to go messing with the lower end.....yet.

  16. #15
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    Re: MPG-Crate Engine

    Quote Originally Posted by WWII
    Another thing that I've been wondering about. Is there a place where I can order ALL the hardware for a 472/500 engine? I mean, all the bolts and things like that in a kit or something?
    on ebay. they have complete bolt sets for 20 - 30 bucks.

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