E-Series Head Bolt Kit Chevy 409 - 85812 625 in Primary - 3

625 in Primary - 3 in Collector - Gaskets / Hardware / Reducers Included - Steel - Black Paint - Small Block Chevy - Chevy Fullsize Car 1955-57 - Pair

Coil Spring - Platinum Series - Conventional - 5 in OD - 13 in Length - 200 lb/in Spring Rate - Rear - Steel - Platinum Powder Coat - Each

RPM Module Chip - 5100-5900 RPM - 200 RPM Increments - Odd - Kit

Nitrous Oxide System - LS3 Plate System - Wet - Single Stage - 75-225 HP - 10 lb Bottle - White - GM LS-Series - Kit

Piston Ring Compressor - 86 mm Bore - Tapered - Aluminum - Black Anodized - Each

E-Series Head Bolt Kit Chevy 409 - 85812 625 in Primary - 3Cylinder Head Bolt Kit E Series Hex Head Chromoly Black Oxide GM W Series Kit