Pontiac 400 455 Forged 4340 Steel Crankshaft 4.250" 2Pc-Seal External Bal.
Details
| Brand: | Speedmaster |
| Part Number: | 1-276-020 |
| Part Type: | Crankshafts |
| Rear Main Seal Style: | 2-piece |
| Engine Stroke (in): | 4.250 in. |
| Crankshaft Material: | Forged 4340 Steel |
| Engine Balance: | External |
| Lightened: | Yes |
| Requires Narrow Bearings: | See notes below |
| Rod Bearings Included: | No |
| Main Bearings Included: | No |
| Rod Journal Diameter (in): | 2.250 in. |
| Main Journal Diameter (in): | 3.000 in. |
| Minimun Rod Length (in): | 6.625 in. |
| Balancer Bolt Thread Size: | Standard |
| Crankshaft Snout Style: | Standard |
| Quantity: | Sold individually. |
| Notes: | Check the bearing to crank radius clearance. Rod bearings may need to be chamfered or alternatively use narrow rod bearings. |
| Tool: | Stroker Combinations |
Speedmaster forged standard weight crankshafts are designed for street or race engines with substantially increased horsepower. Speedmaster crankshafts are precision-ground, heat-treated, shot-peened, inspected, and micro-polished for superior tolerance control. Speedmaster crankshafts are also nitride-hardened for superior wear resistance, have straight-shot and chamfered oil holes, and feature lightening holes in all rod throws. These crankshafts also have a large radius on all journals for improved strength and wear resistance.
