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305 engine & valves

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1st timer, Nov 29, 2000.

  1. 1st timer

    1st timer Registered Member

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    they've told me that on a 305 you should constantly adjust the valve does anyone know why and what happened if they don't get adjusted another thing what does it mean when white smoke comes out the exhaust only when you start it finally what gear oil should i use for limited slip THANKS.
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Your 305 should have hydraulic lifters, so they don't need to be "adjusted".

    That puff of white smoke out the tailpipe is something that pretty much every Chevy engine does as it ages. The valve stem seals dry out and crack, letting oil seep past the seal when the vehicle is parked. The smoke you're seeing is that oil burning off. Don't worry about it until it smokes all the time. [​IMG]

    Read the labels on the gear oil containers in the stores. They'll tell you if they work with limited slip diffs.

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

    Can Can Pusher Man Staff Member Super Moderator

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    GM sells a limited-slip additive that should be added to your diff when you change out your fluid............oh, and welcome to the exclusive "Puff O' Blue" club. If the valve seal leaks get bad enough, your plugs can foul much sooner than usual, so keep an eye on them.
     

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