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Big Block Clones LLC
72mm Bore Clone Block
72mm Bore Clone Block
Regular price
$79.95 USD
Regular price
Sale price
$79.95 USD
Unit price
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Reinforced tall deck GX200 clone block with 72mm bore. Deck is taller than the 135.5mm Tillotson blocks so you can fit a longer stroke with a long enough rod for an acceptable rod/stroke ratio.
Combine with our 60mm crank, ARC 6270 rod, and a "550" flat top piston and you'll be 0.004" above deck, which works perfectly for a 0.035" head gasket. Add our Stage 1 head and intake combo and a 308 cam for a SPICY 245cc combo with loads of torque!
Bore: 72mm \ 2.835"
Deck Height: 136.8mm \ 5.385"
Weight: 5.68lbs
Here are some rotating assembly combinations that you can build with this block and our 58, 59, and 60mm cranks:
| Rotating assemblies with either "550" or .640 pistons | BORE X STROKE | DISPLACEMENT | PISTON CROWN DISTANCE TO DECK AT TDC | Rod/Stroke Ratio |
| 58mm Crank + ARC 6256 - 3.328" | 72mm x 58mm | 236cc | 0.008" under the deck | 1.46:1 |
| 59mm crank + ARC 6269 - 3.313" | 72mm x 59mm | 240cc | 0.003" under the deck | 1.42:1 |
| 60mm Crank + ARC 6270 - 3.303" | 72mm x 60mm | 245cc | 0.005" above the deck | 1.40:1 |
| *Above uses 72mm "550" compression height flat top piston | ||||
| 58mm Crank + ARC 6234 - 3.595" | 72mm x 58mm | 236cc | 0.007" under the deck | 1.57:1 |
| 59mm Crank + ARC 6234 - 3.595" | 72mm x 59mm | 240cc | 0.013" above the deck | 1.54:1 |
| *Above uses Wiseco 17-2835XC .640"CH 3 ring piston | ||||
| 60mm Crank + ARC 6234 - 3.595" | 72mm x 60mm | 245cc | 0.030" above the deck | 1.52:1 |
| *Above uses Wiseco 11132P273 .640"CH 2 ring piston | ||||
| **Always maintain a minimum of 0.030" clearance between the bottom of the head and the top of the piston using the correct thickness head gasket** | ||||
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