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366 Big Block...

Discussion in 'The Garage' started by 1985K20, Jan 31, 2005.

  1. 1985K20

    1985K20 1/2 ton status

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    Does anyone know what is the torque and horspower ratings for the GM 366 (school bus type)? A friend of mine's got one in his truck and always wanted to know.:confused:
     
  2. Poohbair

    Poohbair 1/2 ton status

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    366's are garbage. Don't waste any time/money building one.
     
  3. BlueBlazer

    BlueBlazer 1/2 ton status

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    That's not what he asked, is it?
     
  4. white-rhyno

    white-rhyno 1/2 ton status

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    How is this relavent to the price of rice in china?
     
  5. R72K5

    R72K5 Banned

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    not going ot be only one answer for this, this engine was made for a long time and there will be many different torque and HP rated ones depending on year make model application and so forth, just liek with any other engine,
     
  6. JIMs70K25

    JIMs70K25 1/2 ton status

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    I can check my 70 chassis manual this evening, ironicly I'm looking to purchase a 1970 C50 dump truck with a 366. If I remember correctly HP/TQ is 255/350 or something similar.
     
  7. diesel4me

    diesel4me 1 ton status Premium Member

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    they arent junk!!

    I dont think the 366 is a "junk" motor--granted,its not a 427 or a 454,but it is a very durable and rugged motor,it has the tall deck and 4 ring pistons--from what I've read they can be bored 1/8 over to increase cubic inches...many parts are not the same as the passenger car and light truck big blocks,but many are interchangeable too..They are not noted for high power or torque,but they do last a long time..

    I dont have any specs for horsepower or torque,but I'd say they are about the same as a stock 350 4 bbl motor--not a ball of fire,but they get the job done ok...:crazy:
     
  8. RingMaster4x4

    RingMaster4x4 1/2 ton status

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    I have a 427 Tall deck that came out of a 1985 GMC 6000. in my blazer and I love it I got about 13 MPG in it. It has a lot of TQ I guess it to be about 450 HP and 500- 550 TQ.
     
  9. BlueBlazer

    BlueBlazer 1/2 ton status

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    Is it stock? If so, are you nuts? I would be surprised if its over 250 hp.
     
  10. RingMaster4x4

    RingMaster4x4 1/2 ton status

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    no not 100% stock. One of the big things that I belive ruens the motor is all the limiters and such that was install in the motors.
     
  11. JIMs70K25

    JIMs70K25 1/2 ton status

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    In 1970:

    From my 1970 chassis manual: 235 @4000 and 345@2600 (hp/tq)

    Motor was optional on 50 series and standard on 60 series trucks. The 427 was opt on 60 series .
     
  12. 1985K20

    1985K20 1/2 ton status

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    thanks y'all for you info, i appreciate!:)
     
  13. Poohbair

    Poohbair 1/2 ton status

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    The 427 talldeck and the 366 talldeck are 2 different animals. The 427 can be built to the hilt for the right price... the 366 is a boat anchor.
     
  14. 84_Chevy_K10

    84_Chevy_K10 Banned

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    That is all anybody needs to know about a 366.
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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    Those are also going to be gross ratings, knock 20% off for net, which is how things have been measured for quite awhile.
     
  16. WantedaDodge

    WantedaDodge 1/2 ton status

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    I guess if I had one, that ran, I would run it. But not if I had to build anything. Might get good gasmileage. 350 ft lbs of tork is pretty good for a stock motor. Would headers fit? tall deck, I'd think it might get screwed up.
     
  17. diesel4me

    diesel4me 1 ton status Premium Member

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    I'd run one!

    I would not mind having a 366 under the hood--like I said,its a rugged,long lasting motor,not a powerhouse!!--they are REAL dawgs in stock form,many of the C-60 trucks and busses have govenors on them to limit top speed and RPM's,so they are rather anemic--but you can wake one right up by installing a better cam and carb,and it would most likely outlast the truck its bolted too--the best part is it LOOKS just like the other big blocks,the bling factor alone is a plus!--

    While we would ALL rather have a 427 or 454,or even a 396 or 402,the 366 is not just a throwaway motor by any means--they use the 366 in the trucks and industrial applications that would kill most of the other motors quickly...it would make a good work truck motor for a 1 ton flatbed or plow truck.....and there is a lot more 366's in the yards in busses and big "C" series trucks than any other size big block,so its about the last big block chevy you can buy reasonable anymore...:crazy:
     
  18. JDBlazer454

    JDBlazer454 1/2 ton status

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    I ran one in a 75 K5 of mine as a temp motor and ended up keeping it. Its not a ball of fire like said before but it has a good torque feel to it its not a high revver at all very very low rpms and your at the top of your power band. They are good cheap big block power to build because most people just give them away, mine was free out of a 73 2 ton pump truck.
     
  19. Ddragggon

    Ddragggon 1/2 ton status

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    The 366 motor was designed to be a long lasting industrial powerplant, with a larger bore, but smaller stroke than a SBC 350. The short stroke kept the friction down, allowing these motors to last upwards of 300,000 miles, with little/no rework on them. ( At least I think it's the 366 that is built that way... could be confusing for an old GMC V6)
     
  20. POWERMAD

    POWERMAD 1/2 ton status

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    My buddy just loves the 366 and 427 truck BBC's. They make for a nice hual to the scrap yard.

    As far as the 366 being the last reasonable priced BBC, I dunno about that around here 454's can be had for pretty cheap nowdays.

    As for myself I can see logical reason to drop a 366 in a rig. Free or not.
     

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