Speedmaster®
SKU:PCE290.1119
Chevy BBC 454 4.250" 496ci 2Pc Rotating Assembly Only (F,H,F +30)
Chevy BBC 454 4.250" 496ci 2Pc Rotating Assembly Only (F,H,F +30)
Out of stock
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- Item Condition: Brand New
- Ships within 5 days
- 12-Month Limited Worldwide Warranty
Information
Specifications
| Brand: | Speedmaster |
| Part Number: | PCE290.1119 |
| Part Type: | Engine Rotating Kit |
| Actual Engine CID: | 496 |
| Bore (in): | 4.310 in. |
| Engine Stroke (in): | 4.250 in. |
| Balanced: | No |
| Pistons Included: | Yes |
| Piston Rings Included: | No |
| Piston and Ring Oversize (in): | 0.060 in. |
| Piston Material: | Forged aluminum |
| Piston Style: | Dome top, with single valve relief |
| Piston Head Volume (cc): | -20.00cc |
| Wrist Pin Style: | Press-fit or floating |
| Piston Ring Facing Material: | Plasma-moly |
| Crankshaft Included: | Yes |
| Crankshaft Material: | Forged 4340 Steel |
| Rear Main Seal Style: | 2-piece |
| Engine Balance: | Internal |
| Connecting Rods Included: | Yes |
| Connecting Rod Material: | 4340 Chromoly Steel |
| Connecting Rod Beam Style: | H-beam Street/Strip |
| Connecting Rod Length Center to Center (in): | 6.385 in. |
| Rod Bearings Included: | No |
| Main Bearings Included: | No |
| Cam Bearings Included: | No |
| Gaskets Included: | No |
| Oil Pump Included: | No |
| Camshaft Included: | No |
| Lifters Included: | No |
| Timing Chain and Gears Included: | No |
| Plastigage Included: | No |
| Assembly Lubricant Included: | No |
| Quantity: | Sold as a kit. |
Crankshaft
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.
Connecting Rods
Speedmaster H-beam connecting rods are one of the strongest connecting rods available. Speedmaster H-beam connecting rods are perfect for supercharged and nitrous applications. These rods incorporate a special doweled cap for specific cap-to-rod alignment and are profiled with extra clearance for stroker applications.
Speedmaster H-Beam Street / Strip connecting rods are manufactured from aircraft quality 4340 chromoly steel. The rods are x-rayed and ultrasonically tested with all surfaces shot peened and stress relieved.
Pistons
Speedmaster Forged pistons are made from 4032 aluminum alloy for quieter operation and reduced piston to wall clearance. Up to 20% lighter than traditional forged pistons that eliminate harmful stress concentrations for superior strength. Specifically designed for naturally aspirated or moderate nitrous applications.