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2 more engine questions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by lasvegas, Apr 9, 2001.

  1. lasvegas

    lasvegas 1/2 ton status

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    I appreciate your help with the engine decisions. I just have two more questions. 1) Does my stock engine in my '78 have two or four bolt mains (optional 350 engine) - I am asking rather than pulling the pan and looking. 2) Since I represent one of the local GM dealers, I can get the crate engine at cost + 10%. I was told about $2,100 for the 330 hp and $3,600.00 for the 370 hp. Are these good prices or are there better deals out there like the NAPA 383 I saw some people talking about in another post? If my stock motor is a 4 bolt, could I do better by having it rebuilt and built up a little? Thanks again for your input, I am really close to moving on the engine thing but I do not want to regret my choice or feel like to spent too much on this thing.
     
  2. chvyhs

    chvyhs 1/2 ton status

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    I believe that the last 3 numbers on the block casting should be 010 for a four bolt main. The numbers will be on the bell housing on the same side as cyclinders 2,4,6, and 8. Check with the a machine shop to confirm this.
     
  3. CaptCrunch

    CaptCrunch 1/2 ton status

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    heck if you get them at cost plus 10% I'd get the GM 383 I was talking about. The Napa one is about 2grand too from what mudd'n has said. It's probably a 2 bolt main, but I really doubt you need to worry about it... 2 bolts are good up to 600 hp no prob.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  4. '73 K5

    '73 K5 1/2 ton status

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    That doesn't really sound like super crazy deals on the crate motors. I think the 330 horse one is only around $2200 retail. The new GM Parts 383 looks like the perfect setup for a lot of K5's. Or if you want the real badass stuff and have some extra cash, check out <A target="_blank" HREF=http://www.beckracingengines.com>http://www.beckracingengines.com</A>

    '73 K5
    Chevy good...Ford bad
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    Check prices at <A target="_blank" HREF=http://www.paceparts.com>http://www.paceparts.com</A> on the GM crate motors. They usually have close to the best prices available. You can't tell if your motor is 4 bolt from the casting number. The only way to tell for sure is to pull the pan and look. Being a truck motor in your year range, it is most likely a 4 bolt main block. I have heard a few people say that they cancelled the GM crate 383 (never made any, and are not going to).

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  6. muddin4fun

    muddin4fun 3/4 ton status

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    The Napa 383 (actually a fourstar motor-SWEET!) is a 4 bolt. Very good deal! The GM motors don't sound like that great of a deal. I've seen motors in mags that same price with the same hp range and they had pretty chrome on them-ooo!

    [​IMG]
    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  7. HarryH3

    HarryH3 1 ton status Author

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    The GM crate motors cost more because they are made with all brand spanking new parts. They aren't rebuilt engines.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     
  8. CaptCrunch

    CaptCrunch 1/2 ton status

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    Yes Gm motor are brand new and usually have a better warranty... plus considering I get 20% off it make that 383 come in at about 2400 [​IMG], Although after the lift and stuff I'll be way too brokle for even that [​IMG]. Napa's motor sounds pretty good too... Speedo-motive sells a short block 383 for $1200 as well. Basically you just need to make sure what you're buying is geared low enough in the rpm range.

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

    wayne 3/4 ton status

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    3970010 blocks can be 2 or 4 bolt main. I have one in my 73 p-up that is 2 bolt and it replaced one that was 4 bolt.

    <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>
     
  10. Zepplin

    Zepplin 1/2 ton status

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    Another way to find out if you have a 4 bolt is to pull the timing cover and on the front. There will be either
    a 010 or 020 stamped on the front. If you have this block don't sell it. I think this is a bowtie block and is
    quite valuable.

    74 Blazer
    Kashmir
    Zepplin
     

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