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500, 472, 425, 368 Discussion, HP or MPG and what would you do? in Cadillac Engine Technical Discussion; BTW, Clay is pretty far along now with his mock up rocker shafts for the V8/4 500....
  1. #16
    terrible one's Avatar
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    Re: HP or MPG and what would you do?

    BTW, Clay is pretty far along now with his mock up rocker shafts for the V8/4 500.

  2. #17
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    Re: HP or MPG and what would you do?

    Will he be interested in making more to sell?

    and are they a direct replacement for the stock 425/500 rockers?

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    Re: HP or MPG and what would you do?

    Since you asked... I'd do an MT15, shift at 5500, and call it good. The stock valvetrain isn't THAT bad. But that's only because I don't do a whole lot of highway driving.

    Since you seem to, the MT3 and cyl. deactivation doesn't seem like a bad idea at all. Although I gotta say you're almost assurredly going to fall short of 25mpg. In my 95 ETC, which is 3800lbs, sequential injected, much more aerodynamic, and about a Honda short of your displacement, I get about 27-28 doing 70mph. Adding a couple hundred pounds, a brick wall nose, over a Honda worth of displacement, a carb, that's going to cost more than 2-3mpg.

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    Re: HP or MPG and what would you do?

    Quote Originally Posted by terrible one
    EDIT: What is up with all of MTS cams having a lift "range"? Do they not know what lift they are actually grinding?
    They know. They just arent about to tell you.

  5. #20
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    Re: HP or MPG and what would you do?

    The MT15 on stock valvetrain? I was told I would run into problems if I wanted to use the MT10 on the stock valvetrain....

    With the 2.28 gears, I think the MT3 would actually greatly improve the driveability and assumed power of the car in day-to-day life.

    The 25mpg was just a quick guesstimate.... really even if I got a sloid 22mpg, that is still pretty darn good for the car.... free miles on the highway is how I see it.

    Still pondering the idea... we just got the AC working, but now all that will have to be done over since the condensor would have to come out... not looking forward to that.... I just don't know if it is worth my time, it isn't like I drive all over everyday.... but it would be nice until I build up a 500 for the car.

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    Re: HP or MPG and what would you do?

    Quote Originally Posted by Night Wolf
    Will he be interested in making more to sell?

    and are they a direct replacement for the stock 425/500 rockers?
    No idea, I'd doubt it. With no special machinery, etc I think it is taking a really long time.

    Yes, they are going to be direct replacement, just a 368 V-8-6-4 system with the weaknesses taken out.

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    Re: HP or MPG and what would you do?

    Quote Originally Posted by davesdeville
    They know. They just arent about to tell you.
    Figures. That's stupid.

  8. #23
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    Re: HP or MPG and what would you do?

    2 1/4 exhaust is a waste of money
    go 2 1/2 since im sure it will be crush bent

    TI

  9. #24
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    Re: HP or MPG and what would you do?

    Well, the problem with doing any exhuast on the 425, is it would be a waste in general, since I would be doing it again the future for the larger, more built 500.... which is why I don't really want to do a whole nice dual exhaust on the car right now.

    If I could go big enough on the 425 that would still be good for the 500, then maybe I would.

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