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4 bolt main

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by PineyPower, Nov 2, 2001.

  1. PineyPower

    PineyPower Registered Member

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    What is the big thing about 4 bolt main engines isn`t there a 6 bolt main..when they talk about 4 bolt main do they mean hom many bolts go in to the trans ..please help thanks
     
  2. RedDwarf

    RedDwarf 1/2 ton status

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    They mean how many bolts go into each main bearing cap.

    There is a 6 bolt main on MOPAR stuff, but 4 go in the bottom and one in each side. Called "cross bolted mains".

    Still Poundin' "pavment" after all these years!!! [​IMG]
     
  3. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    4 bolt main means 4 bolts attach the main caps to the block. The main caps hold the crank in place. they are going to be stronger than 2 bolt mains. I dont know about 6 bolt mains though...maby on a nitro burning hemi or somthing .
     
  4. Andreas

    Andreas 1/2 ton status

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    You shouldn´t worry about 2 or 4 bolt mains anyway. 2 bolt goes a loooong way (450-500 hp) and can be equipped with splayed caps, which is superiour to GM 4 bolt any day of the week. Over here (Sweden) 2 bolt blocks are more expensive than 4 bolt blocks.

    Useless info: Should you search for a 400 block the 2-bolt is the way to go!

    /Andreas

    406cui of pure sh*t[​IMG]
     
  5. LKJR

    LKJR 1/2 ton status

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    really, well I can make a hell of a deal on a 89 2 bolt 350 in pieces, $175 and you pay shipping,

    Like em big and topless
    Excuse me...Would you mind removing your import from under my chevy?
     
  6. jwduke

    jwduke 1/2 ton status

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    Early 400SB's were 4-bolt mains from the factory. Later Chevrolet continued building the 400SB w/ 4 bolt mains, but put 2 bolt main caps on them. You can take one of these later 4 bolt main blocks, and have it line bored & use the 4 bolt main caps. But remember if you bore a 400 SB, you need to have the block "sonic" tested, to see if there is enough material left in the siamese cylinders, for proper cooling.

    1 ton '87 Chevy SWB in the making!
     
  7. gator1959

    gator1959 Registered Member

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    400 blocks are stronger w/2 bolt splayed mains,and no chance of tapping into a water jacket.

    '79 K-5,D-44HD(8-bolt),14 bolt(FF),4.09 ratio,427 rat,auto,38" rubber,currently taking body off frame
     

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