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Thread: 350 sbc using 4.0 stroke cranks

  1. #1
    Senior Member MASTER BUILDER
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    350 sbc using 4.0 stroke cranks

    Winter project. Rebuild sbc. Any problems using a crank with a 4.00 inch stroke and 6" rods? Any machine work needed to be done on the block?

  2. #2
    Member MASTER JOURNEYMAN
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    I don't know if a 4" stroke crank will fit in a stock 350 block but if it doe's i'm thinking the block will be one scary looking piece. Seems to me you would have to grind a lot of material away to achive proper clearance.

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    It might cost you a couple blocks if you hit water.
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    Senior Member RACING JUNKIE
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    Quote Originally Posted by heshtesh
    I don't know if a 4" stroke crank will fit in a stock 350 block but if it doe's i'm thinking the block will be one scary looking piece. Seems to me you would have to grind a lot of material away to achive proper clearance.
    x2. Even if you use a 2.000 rod, there is way too much material to grind away. When you get .050 clearance, how much block is left to hold back the oil presure or water? Enough to give me nightmares...

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  5. #5
    Senior Member MASTER BUILDER
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    From what I understand, a sbc 400 stock crank will fit with some machining on the mains. Don't know if this is true. Just thought I'd mention it. There are a few crank vendors that sell the 350 crank with a 4" stroke. Maybe the cranks are for Dart blocks. Don't know.

  6. #6
    Senior Member DYNO OPERATOR
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    the 350 main don't mean 350 block,You get most aftermarket in 350 mains.

    Smaller main=less resistance.Right hink?,Thats what i've been told.
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  7. #7
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    Re: 350 sbc using 4.0 stroke cranks

    Quote Originally Posted by jreiley
    Winter project. Rebuild sbc. Any problems using a crank with a 4.00 inch stroke and 6" rods? Any machine work needed to be done on the block?
    :?: Why do you want that long stroke with such a small piston?

    you building a tow truck?
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  8. #8
    Senior Member RACING JUNKIE
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    There are several people around here running 4" cranks in stock 350 blocks. i CAn aask but i believe they are pouring very little block filler in the bottom of the block, below the sand casting plugs and then grinding away.

  9. #9
    Senior Member RACING JUNKIE
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    use a 400 block with a 3.625 rod you'll love the big piston and little stroke

  10. #10
    Senior Member RACING JUNKIE mytmouz's Avatar
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    Quote Originally Posted by kwkracing
    There are several people around here running 4" cranks in stock 350 blocks. i CAn aask but i believe they are pouring very little block filler in the bottom of the block, below the sand casting plugs and then grinding away.
    If you run I beams no filler eeded, if H beams, then you will need some...
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