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trying to pull the most outta my SB 350...

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, Apr 25, 2001.

  1. BillyBob

    BillyBob 1/2 ton status

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    Well, since I got this 84 sitting in my driveway, I'm thinking about how I could pull the most out of the SB without sacraficing too much in mileage. I'm going to be bolting on some JBA shorties to it and a 3" single exaust is going to be in the works. What else can I do to pull some HP outta this engine w/o moving to a bigger carb? I dunno much about the engine, just that it's a GM crate 350 that was dropped in about 6 years ago, with a couple of Ks on it, rochester quadrajet, AIR (that's going in the garbage), otherwise, stock. I'm thinking about a new intake manifold and MAYBE a cam, if I have the time to get the engine apart. In the meantime, what else can I just "bolt on"?

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    If it ain't leaking oil, it ain't my truck![​IMG]
     
  2. Burt4x4

    Burt4x4 3/4 ton status

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    Do the intake get like a Edelbrock Performer, best for lowend torgue and milage. Works real well with a Q-Jet too. Oh an K&N filter too, MSD Ignition. Sometimes even new wheel bearings can increase your milage, especially if the current bearings are warn and sloppy.......

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <A target="_blank" HREF=http://www.burt4x4.coloradok5.com>http://www.burt4x4.coloradok5.com</A>
     
  3. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I think the intake and exhaust route will gain you some, but for real gains I'd also do a cam swap. Comp cams has a line of 4x4 specific cams that make great low to mid range power...or you could just bolt on a nitrous kit[​IMG]

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  4. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    id go with a cam[​IMG]

    77blazer see it at<A target="_blank" HREF=http://community.webshots.com/user/ssmith6333>http://community.webshots.com/user/ssmith6333</A>[​IMG]
     
  5. wayne

    wayne 3/4 ton status

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    Intake, headers, K&N, cam, will all help. You also might want to consider a set of comp cam magnum roller rockers, and if you can get rid of the smog stuff. MSD ignition system will also help out.

    <A target="_blank" HREF=http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html>http://jamonline.homestead.com/fromthegroundupK54x4/89Jimmy.html</A>
    <font color=blue>Happy Trails<font color=blue>
    <font color=blue>Wayne<font color=blue>
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    If its a bone stock "cheapy" crate 350, some better heads will make a big difference if you want to go that far. 1.94/1.5 valves are big enough for a truck, but headers, Performer intake (not RPM, bigger is not better in all cases) and roller cam and lifters would be a good start also if you have the money and inclination. Adding a bigger cam is going to change the powerband, so you end up losing low end power, which IMO, is not a good thing for a heavy truck that isn't raced.

    Has it had a tuneup? If you are thinking its real low on power, and haven't done the standard tune up, then you may be surprised at what the little stuff can do for you.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  7. ftn96

    ftn96 1/2 ton status

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    The cam always seems to have mixed reviews view the K5's. I personaly dont know. But if they can make a cam that increases top end horsepower seems that they could make a cam that will create more bottom end torque. I have seen some advertised that do this such as companies like Brock and Comp. Do these not produce like they say?

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  8. CaptCrunch

    CaptCrunch 1/2 ton status

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    I guess overall I'd suggest the full length heads... may those afterburners from flowtech and starigh dual 2 1/2's with an equalizer tube or H-pipe. K &N and a MSD offroad Igniot and coil will help out... gap your plugs at .06 for the best results. I guess I wouldn't even bother w/ a cam till you take the heads off cause chances are the heads are chokers... Heck you can bolt on a set on new Vortechs w/ the Edelbrock intake for about $600 and would be the best money you've ever spent with the duals and ignition. A new cam would work great with the heads/intake combo as well.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I got the Comp cams 260 HE for my 350 and it has way more low end torque than before. I tow a 5500 lb trailer with it in the summer and it pulls it no problems. I also have 3.73's and 36's which don't help me and it still pulls hard[​IMG]
    It'll run out of revs by 4500 RPM but I never take it there anyways...
    Some of the other things I've done that netted some real world power gains: I cleaned up and lightly lubed the cetrifugal weights inside the distributor and replaced my vacuum advance. I think this sort of thing is often overlooked but man what a difference. Good quality ignition parts, aftermarket 8.8 mm spiral core wires, full length headers, flowmaster 2 chamber mufflers (all 2 1/2" exhaust) and a new Edelbrock 600 carb. Mostly I tryed to maximize what was there already and keep all the parts working as they should. My mechanical advance was froze...so that simple free clean up job netted me a fair increase in power and drivability.

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>

    <P ID="edit"><FONT SIZE=-1>Edited by tRustyK5 on 04/25/01 12:27 PM (server time).</FONT></P>
     

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