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Dart Big-M Block Machined Upgrade - Scratching The Surface

SHOPPING CART
Manufacturer Description PN Price
CHE Lifter bushings 1002-904-175 144
Dart Big-M block 31263444 2,400
QMP Racing Align-hone BO4 140
  Deck block CNCB09 136
  Lifter true CNCB25 465
  Bore block CNCB10 150
  Power hone with torque plate B13 195
  Detail block (hand-finish deburring, wash, paint) B15 100
  Total $3,730

Dart Big M Block Machined Upgrade Pressing In Lifter Bushings
There's no pretty way about... 
   
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Dart Big M Block Machined Upgrade Pressing In Lifter Bushings
There's no pretty way about it: The lifter bushings must be pressed in using a driver and a hammer. Dominguez placed each bushing in its bore (tapered side down) and drove each bushing into the bore, all the while making sure not to drive them in too deep.
Dart Big M Block Machined Upgrade Checking On Lifter Bushings
Dominguez checked his work,... 
   
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Dart Big M Block Machined Upgrade Checking On Lifter Bushings
Dominguez checked his work, ensuring that each bushing is pressed in properly; too far or not enough can cause lifter failure.
Dart Big M Block Machined Upgrade Drilling Through Oil Gallery
Out of the box, the CHE bushings... 
   
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Dart Big M Block Machined Upgrade Drilling Through Oil Gallery
Out of the box, the CHE bushings needed to be bored to 0.904 inches in order for our lifters to fit. Dominguez first drilled through the oil galleys of each lifter bushing, which feeds oil to the lifters, and then he prepared to set the block back onto the CNC machine.
Dart Big M Block Machined Upgrade Measuring Lifter Bushings
Lagman measured the lifter... 
   
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Dart Big M Block Machined Upgrade Measuring Lifter Bushings
Lagman measured the lifter bushings and programmed the CNC to begin removing material. The CHE bushings' inside diameter measured 0.902 inch, requiring a final finish bore for the additional 0.001.
Dart Big M Block Machined Upgrade Honing The Bore
The bore honing process could... 
   
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Dart Big M Block Machined Upgrade Honing The Bore
The bore honing process could begin by using a torque-plate that was torqued to 65 ft-lb, in oreder to simulate the cylinder wall stress of an actual cylinder head. Without this plate, false cylinder bore readings can be had. Depending on your shop of choice, bore-honing a block with a torque plate could run around $200.
Dart Big M Block Machined Upgrade Pistons That We Are Using
Lagman measured the low-compression... 
   
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Dart Big M Block Machined Upgrade Pistons That We Are Using
Lagman measured the low-compression pistons and took into account piston ring clearance. Before the block was honed, it measured 4.525 inches, and to get proper ring seal, an additional 0.005 inch would have to be removed by honing. Bore honing will also give us the crosshatch pattern we desire, and the pattern will retain a film of oil on the walls of each cylinder.
Dart Big M Block Machined Upgrade Block Fully Machined
From here, our Dart Big-M... 
   
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Dart Big M Block Machined Upgrade Block Fully Machined
From here, our Dart Big-M block was ready for a thorough cleaning and paint. Expect to shell out another Benjamin for a general detail job.
CHE QMP Racing
Dart Machinery
353 Oliver St.
Troy
MI  48084
248/362-1188

www.dartheads.com

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