Forged steel 59mm stroke crankshaft for the GX200 and clone engines. This crankshaft may require clearancing of the block, camshaft, and/or crank counterweights.
Rod Journal Diameter: 1.181"/30mm (GX200/Clone)
Flywheel Taper: GX200/Clone
3/4" keyed output shaft
Displacement:
- 70mm bore = 227cc
- 72mm bore = 240cc
- 76mm bore = 267cc
Here are some rotating assembly combinations that you can build with our cranks and our 72mm bore 136.8mm deck TC225 block:
| STACKUP w/ rod and piston | BORE X STROKE | DISPLACEMENT | PISTON CROWN DISTANCE TO DECK AT TDC | Rod/Stroke Ratio |
| Use 72mm "550" - 0.906" CH flat top piston | | | | |
| 54mm Crank + ARC 6771 - 3.403" | 72mm x 54mm | 220cc | 0.014" under the deck | 1.60:1 |
| 55mm Crank + ARC 6771 - 3.403" | 72mm x 55mm | 224cc | 0.005" above the deck | 1.56:1 |
| 58mm Crank + ARC 6271 - 3.323" | 72mm x 58mm | 236cc | 0.015" under the deck | 1.46:1 |
| 58mm Crank + ARC 6266 - 3.343" | 72mm x 58mm | 236cc | 0.004" above the deck | 1.46:1 |
| 59mm Crank + ARC 6269 - 3.313" | 72mm x 59mm | 240cc | 0.003" under the deck | 1.42:1 |
| 59mm Crank + ARC 6271 - 3.323" | 72mm x 59mm | 240cc | 0.013" above the deck | 1.42:1 |
| 60mm Crank + ARC 6270 - 3.303" | 72mm x 60mm | 245cc | 0.005" above the deck | 1.40:1 |
| 60mm Crank + ARC 6269 - 3.313" | 72mm x 60mm | 245cc | 0.015" above the deck | 1.40:1 |
| | | | |
| Use Wiseco 17-2835XC 0.640"CH 3 ring 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 |
| | | | |
| Use Wiseco 11132P273 0.640"CH 2 ring piston | | | | |
| 54mm Crank + ARC 6268 - 3.707" | 72mm x 54mm | 220cc | 0.024" above deck (cut the piston crown) | 1.74:1 |
| 55mm Crank + ARC 6268 - 3.707" | 72mm x 55mm | 224cc | 0.044" above deck (cut the piston crown) | 1.71:1 |
| 60mm Crank + ARC 6234 - 3.595" | 72mm x 60mm | 245cc | 0.030" above the deck (cut the piston crown) | 1.52:1 |
| | | | |
| **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** | | | | |
| | | | |
| Common Block Deck Heights: | | | | |
| BBC 70mm tall deck block deck height is 138.6mm | | | | |
| BBC 72mm bore TC225 block deck height is 136.8mm | | | | |
| Predator 224 block deck height is 136.5mm | | | | |
| Tillotson racing block deck height is 135.5mm | | | | |
| Predator 212 non-hemi deck height is 135.5mm | | | | |
| Predator 212 hemi block deck height is 135mm | | | | |
| | | | |
| Available ARC GX200 Clone rods: | | | | |
| 1.181" main journal X .709" wrist pin (550 flat top piston) | | | | |
| 6267 | 3.283" | | | |
| 6734 | 3.293" | | | |
| 6270 | 3.303" | | | |
| 6269 | 3.313" | | | |
| 6271 | 3.323" | | | |
| 6266 | 3.343" | | | |
| 6270 | 3.383" | | | |
| 6271 | 3.403" | | | |
| | | | |
| 1.181" main journal x .490" wrist pin (.640CH pistons) | | | | |
| 6234 | 3.595" | | | |
| 6268 | 3.707" |
