Big Block Chevy - Magnum
Standard Features Average weight for a 4.500" stroke, balanced to 2350g. bob weight = 69 lbs.
Stroke Range of 3.500 in. to 5.750 in.
Gun drilled mains, with 8 full counterweights
All rod journals lightened
Dual post keyways (additional available)
Heat Treatment = Ultra Case Deep Nitride
Enhanced rod oiling through the use of main bearing oil hole lead-ins
One and two piece seal type flanges or star flange
Custom flange bolt, dowel and post drilling available
Below is only a partial listing of part numbers. Please call for additional part number information and availability.
| Stroke | Main | Pins | Cammed for rod length | Part # |
| 4.000 | 2.750 | 2.200 | 6.385 | BBO-42B-MG |
| 4.250 | 2.750 | 2.200 | 6.385 | BBP-42B-MG |
| 4.375 | 2.750 | 2.200 | 6.535 | BBB-42B-MG |
| 4.500 | 2.750 | 2.200 | 6.700 | BBQ-42B-MG |
| 4.750 | 2.750 | 2.200 | 6.700 | BBS-42B-MG |
| 4.625 | 2.750 | 2.200 | 6.700 | BBR-42B-MG |