CP Pistons Bullet Series Forged Pistons - Small Block Chevy 4.165 Bore (+0.040 in) - Set of 8

Forged 2618 alloy flat top pistons for a Small Block Chevy running a 3.750 in stroke and a 6.000 in rod, machined to a 4.165 in finished bore, which is 0.040 in over the 4.125 in standard and works out to roughly 409 cubic inches. Compression height is 1.125 in with a -6.9cc flat top crown and two symmetrical valve reliefs cut 0.310 in deep, giving about 11.4:1 against a 64cc chamber, so actual ratio will move with your own heads and deck height. Each set is balanced to within one gram and carries dual forced pin oilers, contact reduction grooves, accumulator grooves and a forged side relief. Chromoly wrist pins, wire locks and a 1.5mm, 1.5mm, 3.0mm ring pack are included, and CP catalogues this part for normally 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