340 Series Aluminum Cylinder Heads Big Block Chevy

Name: 340 Series Aluminum Cylinder Heads Big Block Chevy
Brand: PROMAXX PERFORMANCE
SKU: 723-9341
Price: 3174.25 USD
Availability: InStock

^$3,174²⁵

Ships on 09/21/2026

Lowest Price Guarantee

340 CNC Ported Series Aluminum Cylinder Heads

340cc Intake Port Volume

340 Series Aluminum Cylinder Heads

Big Block Chevy

100% CNC-Ported

340cc Intake Ports

121cc Combustion Chamber

2.30'' Intake / 1.88'' Exhaust Valves

7/16'' Rocker Arm Studs

.600'' Max Lift

Steel Retainers

Assembled, 2/pkg

.600' Max Lift Hydraulic Roller Camshaft

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

ProMaxx heads have started a revolution in the performance world. They have custom designed a head to meet the demands of the Big Block Chevy world, while keeping the quality high and the price reasonable. These BB-Chevy heads come in an As-Cast series or Full CNC-Ported series. The As-Cast series features ''as-cast'' runners and combustion chambers with hand blended valve bowls. The Full CNC-series heads have professionally machined ports and combustion chambers that flow and perform as good as or better than some of the best cylinder heads in the industry. Basic components include U.S. made bronze valve guides, and ProMaxx 5-angle valve job. Assembled heads include 21-4N stainless valves, springs, retainers, 7/16'' rocker studs, guide plates, and viton seals (Bare heads do not include these items).

Features:

A356-T6 Aluminum Castings
Efficient Chamber Design
5-Angle Competition Valve Job
Diamond-Honed Bronze Guides
Available with As-Cast or Full CNC'd Ports and Chambers
Sold in Pairs, 2/pkg.

JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.