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camshaft options

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shupach, Oct 4, 2001.

  1. shupach

    shupach 1/2 ton status

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    I just rebuilt my engine and used a new cam w/ oem specs, lifters(the small heavy things) used original lifter thingers(the long ones) and the original rockers. I need more power and i think the best way to do it is to replace the cam, im thinking roller cam with roller lifters and roller rockers. Does anyone have any suggestions on specifics and how much hp i will gain from this new cam?

    thanks

    phill
     
  2. Thunder

    Thunder 3/4 ton status

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    Do you have a good aftermarket manifold, headers ignition? If your motor is stock a bigger cam and roller lifters and rockers wont help much. A cam like that needs to be able to berathe. Without headers and a manifold a hot cam is a waste of money. If you need more power, Edelbrock makes good headers and matched manifold and cam kits that will help a lot.
    if you already have these mods depending on the lift and duration of the new cam you can expect to gain 14 to 25 hp. from a modest performance cam with a roller valve train. If you go with the rollers you may also need to get taller valve covers so your lifters dont hit.

    <a target="_blank" href=http://coloradok5.com/gallery/Thunders-Blaze>http://coloradok5.com/gallery/Thunders-Blaze</a>
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  3. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I think one of the bigger selling points for the roller cam is that it produces a smoother idle than a flat tappet cam. Personally I prefer a little lump and grump, makes a healthy sounding idle.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  4. shupach

    shupach 1/2 ton status

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    ya i bought a new holley street dominator manifold and a holley 750 cfm double pumper carb. So theres plenty o breathin.


    phill
     
  5. BorregoK5

    BorregoK5 1/2 ton status

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    Crane Cams has a series of retrofit roller cams for early small blocks which don't require any grinding of the block.
    <a target="_blank" href=http://www.cranecams.com/master/apps/chevy18.htm>http://www.cranecams.com/master/apps/chevy18.htm</a>

    I've had quite a few talks with their tech staff on what to use in my 400 based upon different scenarios, I'd give them a call, they are quite knowledgable.

    Comp Cams has a few as well, but I believe they require grinding. They also have a 4x4 roller cam line specific to rock crawlers needs. Check it out or call them.



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  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Roller cams are awesome. Ramp speed compared to flat tappet cams can be drastically increased without problems. Idle quality is the last thing I'd be thinking about with a roller cam. Roller cams are expensive (unless your engine had one stock) but they'll make at least 20 more HP, no matter what the application.

    Edelbrock makes good intakes, but I wouldn't buy their camshaft. I have Comp's Xtreme 4x4 cam which is esentially a copy of their Performer cam, but with more valve lift for more flow, and it's far more agressive on the ramps to make more vacuum and more torque. The Comp design is so far superior to the Edelbrock cams, and it's not any more expensive, so that's what I'd go with. Just don't put it in a fuel injected engine. In fact, if you have fuel injection, be really careful with your cam choice if it uses a MAP sensor.

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

    Tatman Registered Member

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    Depending on the ci of your motor, compression, bored?, etc... that 750 may be too much carb for your application. I have one on a '53 F-350 w/460ci and it is a piece of sh**. Only the second Holley I've ever owned and never had any luck with them. Q-Jet all the way!!! You'll get great performance and better fuel mileage to boot.

    www.saddletramps.com/BlazerK5.htm
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Maybe a bit much carb, intake may be a bit much (if its single plane)

    If you ask me, stock cams were designed pretty well for the trucks. Maybe a bit old on the technology side, but they work well to produce low end power, which is what trucks generally need.

    Personally, if you've got stock heads and manifolds, aftermarket heads and headers are going to be the two single largest power gains you are going to make.

    For the cost of a roller cam/lifters (looking at $500) you CAN get a set of better heads or most definitely get good headers for that price.

    Roller cam makes some power, but the difference between roller/flat tappet cams with similar specs, vs changing manifolds to headers or vs changing 1976 smog heads to Vortecs or AFR's or some similar heads, are not going to be as much. The Vortecs, on a 350, are typically rated at about 40hp MORE, just from bolting them on, no other changes like exhaust, intake, so on.

    FWIW, 10HP is generally thought of as the point where you get a "seat of the pants" difference.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
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  9. 84_Chevy_K10

    84_Chevy_K10 Banned

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    My cam isn't all that much bigger than a stock cam. It's 206/214 duration @ .050", .432/.453 lift. It's made for torque. And it makes a lot more than stock.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Not much bigger, but dual pattern, which certainly works better in most applications than the typically single pattern stock cams from that era. Technology has not left cams behind.

    you are running about the same lift/duration numbers as the cam I am putting in my truck. Should find out next week if I get a TPI setup for it : )

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  11. pr1aw

    pr1aw 1/2 ton status

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    My .02. How about roller rockers with a 1.8 aspect ratio instead of the 1.5 stock. Makes your engine think it has a bigger cam. Need to have a free flowing exhaust too.
     
  12. 2cocky

    2cocky Registered Member

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    I just put an comp cams 4x4 extreame cam in today boy what a differance it's woth every penny making big torque down low where a big truck needs it. also am running a preformer intake and 600 edelbrook carb. I can finaly get out of my own way! :)

    OOOPS....I THINK I JUST RAN OVER YOUR JEEP THING!!!!!
     
  13. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Dorian,

    Be careful with lobe seperation angle on an injected engine.

    I have a Comp Xtreme 4x4 as well, the smallest model. It's in a 305, and DD 2000 says it's 250 HP @ 4500 and 330 ft-lbs @ 3000. I definitely believe it.

    It's a long story why I have a 305, but if you guys rode in my truck, you'd never believe it.

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

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