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ATTN 454 Owners

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Mar 14, 2001.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I have acquired my truck with a 454 (yet to be installed). The motor was completly stock when I got it. The only mod so far is a Edelbrock Air Gap intake. I am thinking of replacing the cam/tappets too. Is the cam in the 454 good enough, or am I loosing out on a $hitload of power without a new cam? I don't want a KRAZY cam, just something to make the exhaust a little lopey :-) I will be running Hooker headers and full 3" duals. Thanks all!
     
  2. Shawn

    Shawn 1/2 ton status Premium Member Author

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    You should find out what you have first. Compression ratio? Heads? Oval, peanut or rectangle? All these things make a difference on proper cam selection. Any HP BBC book is a good place to start. Comp Cams and other companies can help you pick the proper camshaft but they will ask some questions about your engine. Stock engines with peanut port heads are only pushing 230hp at the flywheel but with some decent oval heads and a few other things, it's not difficult ot achieve 450hp.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     
  3. DMK

    DMK 1/2 ton status

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    Comp cams 268H, put one in my dads 71 corvette sounds great at idle some noticiable low end loss. But not much. Will maintain good vaccum too.
     
  4. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I have a HI-PERF (cast words in bel-lhousing) 454 w/rectangle ports. Hooker headers, and the Edelbrock Air Gap Intake. One item I forgot - a 2200 torque converter.

    I was thinking about getting the Lunati P/N: LUN-00020LK, or the LUN-00024LK. The difference seems to be the powerband, and that the "20LK" seems to have more low end torque, while the "24LK" offers a little more high-RPM horse. I like to drive with my foot into the gas a lot, and the HP seems more attactive, BUT it is a BIG truck so the torque may come in handy too.

    The Lunati kit (pg. 70 in Summit) is nice because you get the cam and lifters for only $128, and I have to slide this "under the table" and past the wife!

    Thanks for any additional input!
     
  5. Shawn

    Shawn 1/2 ton status Premium Member Author

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    I'm not sure what the specs are on those cams but they might help. I suggest a program like Dyno2000 where you can actually input the cam specs and you'll get a good idea of what torque and hp curves you might get. I went with a Comp 276 roller cam which seemed to offer good upper hp and still good low end torque. The roller cams are pricey but they do increase HP/torque. You really need to figure your compression ratio. There's a calculator to help with that. If you're heads haven't been milled, you should be able to find the combustion chamber size. Rectangle ports aren't good for low RPM use but great for high RPM HP. The casting # of the heads should be located by the springs and www.mortec.com should have the specs.

    Shawn
    87 K5
    few mods[​IMG]
    <A target="_blank" HREF=http://www.off-road.com/chevy>http://www.off-road.com/chevy</A>
     

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