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Thread: dart big m block question

  1. #1
    Member JUNIOR BUILDER
    Join Date
    Jan 2006
    Posts
    98

    dart big m block question

    i have a new dart big m billet cap block i am starting to assemble but i noticed a slight mis alignment between the rear main bearing oil hole and block.called dart they said it would not be a problem,has anyone out there run into this and what do you think?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
    Location
    Fountain,MICHIGAN
    Posts
    856

    Block

    Mine was the SAME Way,Until I took a Carbide Cutter and Chanferred it!
    Later
    G 8)

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Nov 2003
    Location
    NORTHEAST
    Posts
    290
    Here is a list of things that need to be checked before and assembley work is done and the Dist. should not be over looked!!

    Some block notes:
    I deck all of them to a finished number depending on gasket & desired piston height
    Block needs to be honed with a plate or bored & honed depending on bore
    Bottoms of bores need to be chamfered
    Most need the lifter bores honed, at the least checked
    Most need line honing
    All pipe threads need to be retapped
    Oil return from fuel pump cavity needs to be done
    Core plug holes need deburiing
    CHECK THAT THE DISTRIBUTOR GEAR DOES NOT CONTACT THE BLOCK BY THE CAM. There is a big cast blob down there you may want to relieve.
    You can machine the gear to clear if you forget but it is nicer to fix the block if necessary
    Check all the timing bolt holes with air, some may go into water. Same with the motor mount bolts
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  4. #4
    Senior Member MASTER BUILDER
    Join Date
    Aug 2003
    Location
    Big Lake, Minnesota
    Posts
    162
    Quote Originally Posted by hink
    Here is a list of things that need to be checked before and assembley work is done and the Dist. should not be over looked!!

    Some block notes:
    I deck all of them to a finished number depending on gasket & desired piston height
    Block needs to be honed with a plate or bored & honed depending on bore
    Bottoms of bores need to be chamfered
    Most need the lifter bores honed, at the least checked
    Most need line honing
    All pipe threads need to be retapped
    Oil return from fuel pump cavity needs to be done
    Core plug holes need deburiing
    CHECK THAT THE DISTRIBUTOR GEAR DOES NOT CONTACT THE BLOCK BY THE CAM. There is a big cast blob down there you may want to relieve.
    You can machine the gear to clear if you forget but it is nicer to fix the block if necessary
    Check all the timing bolt holes with air, some may go into water. Same with the motor mount bolts
    Thanks. I have a new Dart Big M block too with billet caps still in the crate and I was wondering the same thing.

  5. #5
    Senior Member MASTER BUILDER
    Join Date
    Dec 2005
    Location
    Napier, New Zealand
    Posts
    230
    All that's worth writing down. Thanks.
    It Ain't Over Til Its NOVA - 634ci of S*#t Your Pants!

  6. #6
    One thing that I came across was the oil drain back holes in the heads need to be check. We have Dart heads and a Dart block and the drain holes in the heads were blocked by the block.


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