Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Chevrolet Performance 12363425

Rectangular Port Aluminum Cylinder Head for Big Block Chevy

Chevrolet Performance 12363425


jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Chevrolet Performance 12363425 Rectangular Port Aluminum Cylinder Head for Big Block Chevy $770.27
To order this item contact Customer Service at 1-800-345-4545.
Big Block Chevy Rectangular Port Race Head
  • 115cc ''Open'' Combustion Chamber
  • Machined for 2.19" Intake/1.88" Exhaust Valves
  • 380cc Intake Port - Raised .100
  • 110cc Exhaust Port - Raised .750
  • Bare Head, Sold Individually

  • Chevrolet Performance 12363425 Details

    Race Cylinder Heads

  • Rectangular Port

  • Machined for 2.190"/1.880" valves (+.400" long required)
  • 380cc rectangular intake ports - raised .100"
  • 110cc exhaust port - raised .750", vanes in port floor (''W'' port)
  • 115cc ''open chamber'' combustion chamber
  • Rocker cover rails raised .250"
  • Two additional head bolt holes in valley
  • Pushrod guide plates P/N 809-3860038 must be ground for clearance

  • Specifications:

    Manufacturer's Part Number:

    Chevrolet Performance Bow Tie Cylinder Heads are an ideal combination of street drivability and drag strip performance. They provide a broad power range with ample low-end torque, excellent throttle response, good mid-range torque and enough top-end power to beat your competitors to the finish line! Bow Tie Street Cylinder Heads have rectangular or oval intake ports. Rectangular intake ports are larger in volume and designed to enhance high-RPM horsepower. These heads are best for vehicles that see frequent drag strip action. Cylinder heads with oval intake ports are smaller in volume and designed for greater low-RPM torque. Oval port heads are best for street applications where lots of bottom-end off-the-line power is desired.

    Chevrolet Performance Bow Tie Race Cylinder Heads are designed for monster-cubic-inch stroked big blocks to maximize their performance potential. They're made of 356-T6 aluminum with huge, raised intake ports; larger valves; smaller combustion chambers; and two additional head bolts for increased clamping force. The runners are purposely left smaller to accommodate custom porting.

  • 356-T6 aluminum
  • Rectangular or oval ports
  • Will work on Mark IV and Gen V/VI blocks
  • 9/16" thick decks
  • As-cast intake and exhaust ports
  • No heat risers
  • 1.55" valve spring seat diameter
  • Heli-coiled 7/16" screw-in rocker stud holes
  • Designed for use with 3/8" pushrods

  • Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations