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Collapsed Lifter

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by K10, Feb 13, 2002.

  1. K10

    K10 Registered Member

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    I have a collapsed lifter so I decided I might as well put in a new cam while i am at it. Has anyone ran a comp cams xtreme 4x4 cam? I was looking at the 12-235-2 or the 12-239-3. One has a duration @.05 of 210 Int 218 ext .447 Int .462 Ext Lift. The other has a duration @.05 of 218 int 226 ext .462 Int .480 Ext lift. Any suggestions would be appreciated.

    <a target="_blank" href=http://nick.rockcrawler.com>nick.rockcrawler.com</a>
     
  2. BorregoK5

    BorregoK5 1/2 ton status

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    I run the 12-231-2 in my 415 and it has great torque and a great idle on a TCI low stall 4x4 converter. I imagine with a stock converter you'd be quite happy with both your choices, the smaller for more rock crawling or the larger for more street or mud.

    I started with nothing and I still have most of that left! - <a target="_blank" href=http://community.webshots.com/user/borregok5> Pictures</a>
     
  3. bigmack

    bigmack 1/2 ton status

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    I will be rebuilding my 350 soon &amp; I have been looking at the Crane Energizer. You can get one of these in several combinations that should work well in a 4x4 &amp; you can buy the cam &amp; lifter kit from jegs or summit for about $78. Comp and Crane are both good brands so I will probably go with the Crane.

    '80 K10 350/350/NP205/14B/10B/4.10/4"Lift/Q78-Buckshots
     
  4. K10

    K10 Registered Member

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    I have a manual trans so I was wondering if it will hurt my low rpm torque enough to worry about.

    <a target="_blank" href=http://nick.rockcrawler.com>nick.rockcrawler.com</a>
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Remember these two general rules:

    Duration builds horsepower
    Lift builds torque

    The Comp Xtreme 4x4 cams have low duration and very high lift. They put that $78 Crane to shame.

    Both the cams you mentioned may work, but that all depends on carb, intake, exhaust, headers or not, gear ratio, compression, cruise RPM, gears, what you're going to use it for, etc.

    I have the smallest Comp Xtreme 4x4 cam. I am very happy with it.

    I think, of the two you mentioned, the smaller one would be better. In fact, if your motor isn't 9:1 CR or more and you don't have pretty low gears, I'd get the smallest Xtreme 4x4. Bigger number seem cool, but usually smaller numbers make your truck more fun to drive.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  6. K10

    K10 Registered Member

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    My truck has headers, dual pipes, msd, edelbrock performer intake, edelbrock 600 cfm carb, 4.11 gears and stock compression 8.0:1?. I have been using an edelbrock 2102 cam. It does alright but it seems to lack in power from 2000 rpm and up.

    <a target="_blank" href=http://nick.rockcrawler.com>nick.rockcrawler.com</a>
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    8:1 CR? Believe me. Get the smallest Xtreme 4x4. You won't be disappointed.

    It's 250/258 advertised, 206/214 @ .050", .432/.453 lift, and ground on a 111* lobe seperation angle.

    Don't go with a bigger cam with 8:1 compression. You're just going to be spewing the fuel right out the tailpipe if you do.

    The Edelbrock cam is old technology. The Comp will put it to shame.

    If you really want, get the 210/218 cam, but I wouldn't. Stay small, stay torquey.

    DD 2000 puts my 305 at 250 hp @ 4500, 330 ft.-lbs @ 3000 with that cam. My 305 is 9.2:1 CR though and uses a 500 cfm Edelbrock. Other than that, it's pretty similar to your engine. With a 600 cfm carb, I'd be at 252 hp @ 4500..but I like the throttle response of the 500, so I got rid of my 600 and bought the 500. If that doesn't sound like much, keep in mind that's almost exactly the same as a Vortec 350. (They're 255/330 at the same RPMs)

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     

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