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lacks power

Discussion in 'The Garage' started by johnathan, May 21, 2006.

  1. johnathan

    johnathan 1/2 ton status

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    My dad bought a 78 chevy 350/350trans.The motor seems to run great,it just lacks power.What are some things to check besides comp.test and vac test and timing exhaust seems to be clear too,no cat
     
  2. sled_dog

    sled_dog 1 ton status

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    how many miles? If it really seems to lack power then its not running great is it? If its really running great, its likely just tired or you are expecting way too much. A stock 78 pickup wouldn't have had a ton of balls. What gear ratio in the axles? Could be like my 84 K5 and have 2.73s behind a 305. Yeah that was a good choice...
     
  3. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    I think the 350 SBC truck engines were only rated at ~160 HP or thereabouts in 1978. The pre-EFI smog years were a terrible time for car and truck enthusiasts.

    Thankfully, there are easy-in crate engines :D
     
  4. TDAWG1

    TDAWG1 1/2 ton status Premium Member

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    valve seals
     
  5. johnathan

    johnathan 1/2 ton status

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    Yeah I would'nt expect it to be hot rod,but compared to the 350 in my K5 it just seamed mighty sluggish
     
  6. HarryH3

    HarryH3 1 ton status Author

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    Yours is an '84. 1978/79 was a dismal time for smogger engines. :( The main "solution" from Detroit seemed to be lowering the compression until the engine barely ran. :mad: Compression ratios in the 7.5-8.0:1 range weren't uncommon then. :( I had a new '79 F-150 back then with a 351 and it could barely get out of its own way. :doah:
     
  7. jk3078

    jk3078 1/2 ton status

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    try a full tune up, fuel filter, plug wires, the works. also run some Sea-foam through the tank and get fresh gas in there, sometimes this makes a big differance in an older truck that may have done some setting. Just my .02.
     
  8. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    really !!!! I used to wheel the hell out of mine.. always had enough power.....
    had 33's and 3.73's with a turbo 400.. then came the 33's and 4.56's with a manual (full rollin chassis swap!!!) :bow:
     

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