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What year did the 350 truck motor get the roller cam?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shum1, Dec 16, 2000.

  1. shum1

    shum1 1/2 ton status

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    Just curious, I have a 1990.
     
  2. HarryH3

    HarryH3 1 ton status Author

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    I think it's 1986. The same year they went to one piece rear main seals and center bolt valve covers.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    I don't think any 350 truck motors have factory roller cams.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  4. blazer72

    blazer72 1/2 ton status

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    The 350 that came in my 93 Suburban had the roller lifter block, the new rear main seal and the metric headed bolts that aren't metric and the center bolt valve covers. Even had a 4 bolt main's but it did not have roller lifters.

    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  5. Channing74

    Channing74 Registered Member

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    I believe roller lifters are in the vortec motors ..... I could be wrong ..... been known for it once or twice .... I do know they havnt been seen in anything earlier than that.

    Bigger Is Better
    Channing74
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Guess I'll have to dig out the factory manual and see what it says. I've got the '87 version at the house.

    The 6.2 diesel came with a roller cam, all the way back around 1982. Even the wimpy 4.3 in my '91 S-10 has a roller cam.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  7. HarryH3

    HarryH3 1 ton status Author

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    OK, here's what I've been able to find out. In '87, the factory manual shows that the 4.3 came with a roller cam, but the small block V8's didn't. I had an '87 engine in my K5 with a factory roller cam, but alas, it came out of a Corvette. I thought that all the small blocks came that way, since I'd seen them myself inside the 'vette motor and my 4.3.

    So next I dug out the factory manual for the 94's. Still, no roller cam listed for the small block V8's. &$^%#! One year there was a big HP jump, from around 200 up to 255 HP for the 350. Was that the year they went to the roller cam finally? I don't know. Don't have anything around here that explains it.

    The good news is, non-roller cams are WAY cheaper to replace. Or, if you really want a roller, you can get aftermarket roller lifters and cams to fit the non-roller engines.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  8. bart

    bart Registered Member

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    I believe this is when the GM Small blocks went to the one-piece rear main seals...as was already stated...for some reason I recall 1987 as being the model year change for the roller cam/lifters...as well as the different intake manifold bolt angles...and centerbolt valve covers, tbi, etc. etc.
     
  9. blackwidowk5

    blackwidowk5 1/2 ton status

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    I have a '98 350 out of a suburban, I'm almost positive that it has the roller cam.
     
  10. Sparky

    Sparky 1/2 ton status

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    I am almost certain it was 86 or 87. I know this because I was thinking about buying an aftermarket roller cam for my 78. The aftermarket roller cam and lifters are much more expensive then the engines that had OEM roller cams. I would have to look in my summit to find out for sure, but i know it was one of those two years. Oh, and the HP increase someone was talking about from 200 to 250 was when they went to the Vortech heads. Should be 96 on that.

    P.S. I did not get the roller retro fit. It would have been a couple hundred more than the comp cam 4x4 and lifterst that I got.

    Sparky

    When all else fails... Check the blinker fluid.
    78 K-5
     
  11. The only way to get a foctory gas 350 roller motor before the 96 vortec was a hipo f-body or vett.Alot of 305 were roller motors starting somewhere around 88 or 89.
     
  12. K5 NUTT

    K5 NUTT 1/2 ton status

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    I have a 4 bolt main 99 350 i saved from a 1 ton p/u...roller cam. Vortech's came out around 95 i believe and i think its a vortech thing...pretty cool though.

    Azblazer

    1979 K5
    1976 K5 Chalet
    1972 K10 Suburban
     

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