CP Pistons Bullet Series Forged Piston Set 4.500 Bore - Big Block Chevy 4.000 Stroke, 6.385 Rod, 24.5cc Dome - Set of 8

A set of eight forged Bullet Series pistons machined from 2618 aluminium forgings for Big Block Chevy engines running 24 degree or 26 degree open chamber heads. Bore is 4.500 in on a 4.000 in stroke and a 6.385 in rod, giving 509 cubic inches, and the 24.5cc dome yields a 10.60:1 compression ratio against a 118.0cc chamber. Compression height is 1.400 in and the heavy duty .200 in wall pins measure .990 in diameter by 2.930 in long. A ring pack is supplied with the set in 1/16 in top, 1/16 in second and 3/16 in oil. CP rates the set for naturally aspirated use.

Specifications

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy