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motorhome engine

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chevyguybc, Nov 10, 2006.

  1. chevyguybc

    chevyguybc 1/2 ton status

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    okay i found this motorhome engine. its a 78-82 gmc motorhome. like a 20 footer at least

    it runs perfect, its on propane, says 01893 on doomter. i bet its 101893

    i would be converting it to gas, do motorhomes come with smallllll valve heads.. would it be propane out of the factory or did someone do the heads???????


    alsooo , could it be a 400, he says its a 350 4 bolt main, but ive heard now they come with 400s!!!! and forged cranks

    anyways what you all think.. 300 cdn for this perfect running propane small block chevy
     
  2. bigred81

    bigred81 1/2 ton status

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    400 small blocks never came with forged cranks always cast cranks. Yes they did come with a 400 small blocks. If a 350 is in there it will have a forged crankshaft, deep dished pistons, and small valve heads because it was built for pulling so GM used small intake runners so they air in the ports would be flowing real fast to help with the low end torque. Down here in tx we look for old grain trucks and motorhomes because the motors are built with a very strong rotating assembly but the heads and pistons are designed for great low end torgue but poor end speed. Get me the casting numbers and I will tell you what you have.

    bigred81
     
  3. chevyguybc

    chevyguybc 1/2 ton status

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    awsome, i ended up picking up a 350 4 bolt 78 engine for 120... it was running but needs a cam intake carb dist.. water pump etc

    it came with the 624 truck heads.. this motor is going in my truck for Daily driver, plus camping/offroad... so im thinking the comp 268he, the 624 truck heads milled a bit for more comp...

    the motorhome engine will be a backup for me if this one blows.... what are the 400 casting numbers

    i know 509... what else...
     
  4. bigred81

    bigred81 1/2 ton status

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    Some of the early 400 casting numbers are 1970 -1974 are 511, 1973-1976 are 817, and I think 509 from 1975-1980 with the 509 being the high nickel block. Only thing is the truck heads use very small valve so do not expect it to be fast above 4500 rpm.

    bigred81
     
  5. chevyguybc

    chevyguybc 1/2 ton status

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    well its going in my truck, who cares above 4500rpm, this is no mud truck

    the 350 motorhome will be back up
     
  6. bigred81

    bigred81 1/2 ton status

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    If you are happy with the way it will run that is all that counts. It will pull very good at low rpms so you should be very happy with that combination.

    bigred81
     
  7. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Propane is popular out here with the krawlers . Runs great at angles . I would run that . Only downside is you smell like dinner cooking :thumb:
     

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