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'87 TBI 350 in Blazer

Discussion in 'The Garage' started by pitbulls'n'blazers, Nov 27, 2006.

  1. pitbulls'n'blazers

    pitbulls'n'blazers Registered Member

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    Hi I have a couple of questions about the stock 350 that's in my '87 Blazer. First is it a 2 or 4 bolt main engine? Also what is the cfm on the stock TBI?

    thanks!
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The block could be either a 2 or 4 bolt main. IIRC the factory TBI unit only flows 470 cfm
     
  3. pitbulls'n'blazers

    pitbulls'n'blazers Registered Member

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    Is there a way of telling if it's 2 or 4 bolt with out taking off the oil pan?
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Nope, must pull the pan to find out.
     
  5. pitbulls'n'blazers

    pitbulls'n'blazers Registered Member

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    I'll check it out when I change the oil. Thanks for your help!
     
  6. 4xcrazy

    4xcrazy 3/4 ton status

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    uuuh, yeah, run the casting numbers on the rear driverside tab of the block,,,,,:confused:
     
  7. JEBSR

    JEBSR 1/2 ton status

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    Only sometimes. allot of casting numbers are either/or.
     
  8. sandawgk5

    sandawgk5 3/4 ton status

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    Look at the vin number. To my knowledge in 87 the K5s only came with 2 bolt mains. The HD emissions engines could be either or but not the K5 engine.

    Ira
     
  9. dyeager535

    dyeager535 1 ton status Premium Member

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    If you get the chance and remember, when you find out, post the suffix code and whether two or four bolt in this thread. I'm trying (not very hard) to see if suffix codes can be used to determine two or four bolt. Pointless I know, but so far it holds true. If an engine with suffix code XYZ is a 4 bolt, so far any other engine that is the same suffix code is also.

    Suffix code located on the flat pad of the block behind the alternator, just forward of where the head meets the block.
     

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