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Which motor is this?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by NewK5Guy, Oct 21, 2001.

  1. NewK5Guy

    NewK5Guy 1/2 ton status

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    From the outside, someone tell me what to look for.
    My friend's 76 k20 pickup is coming together. I jsut put a new rad, heater hoses, and a rearview mirror in it this weekend. I also swapped out the coolant gauge sender. But this freaks me. The sender was in the side of the block, in between the front exhaust ports on the driver's side. The hole in the intake manifold had a plug in it.(the plug accepted a standerd 3/8" ratchet, but it wouldn't budge) When I pulled the original sender out, it was smaller in dia to the new one so I had to also pull out some sort of brass sleeve which looked original. The new sender slipped right in and works fantastic. Is this normal? Every engine I have ever seen has had the coolant senders on the intake, even on my 92 Tbird SC(still for sale, heavily modified), both senders are on the intake. Can any of you educated people tell me if this is truly the 350 the original owner claims it is? The 4 barrel carb is Rochester, but we don't know the model yet. It looks factory(complete with dirt, most everything unhooked). Also, there is a plug on top of the water pump which looks to be plugging the hole hole for the water bypass. Is this normal for this old motor or was something done? Could this possibly be a 305? I'll take another look at it this week and get some more descriptions. Some time before the end of the year a I'm gonna get him to get a compression and leakdown test done. Maybe then we can get a displacement test done as well. FYI: Tranny is a th350, t-case is I think a 205(full time with manual front hubs).
     
  2. Pugsley

    Pugsley 1/2 ton status

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    That's where the sender is on my 350 - ½" NPT hole. Find the casting #'s and we'll tell you exactly what it is[​IMG]

    Of the 5 toughest dogs in the neighborhood, my cat's ranked #3
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I've seen those senders just about in other places where you have not mentioned! [​IMG]

    Some cars I had in the past had them where you described. Most were on the heads, though.



    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  4. outlaw612

    outlaw612 1/2 ton status

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    My 350 has it in the head like you have described.

    BTW, full time t-cases were the 203's.

    <a target="_blank" href=http://www.geocities.com/outlaw613/K5.html>http://www.geocities.com/outlaw613/K5.html</a>
     
  5. 55Willy

    55Willy 3/4 ton status

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    For the heater plug on the water pump. That is because on trucks they had the hose go to the radiator instead. Just get the numbers off the block from behind the alternator. that will tell you and us what it is.

    <font color=red>Life is like a mud hole:</font color=red><font color=blue>
    When the S#!T gets deep, you have to keep moving and friends can always pull you out</font color=blue>
    55 Willy's
     
  6. eastk5

    eastk5 Registered Member

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    I have an 84 k5 with a GM target replacement motor(305) that is about 3 years old. the temp. sender is in the side of the block where you descibed. hope this info helps.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    My '90 Suburban has the sender right between exhaust ports 1 and 3. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     

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