Flow Chart

Features:

• Bare cylinder head
• For Big Block Chevy applications
• 444 cc (cubic centimeter) intake ports
• The intake port is raised .300 in.
• 100 cc (cubic centimeter) combustion chamber
• 20-degree valve angle
• Intake port flows 495 cfm (cubic feet per minute)
• Exhaust port flows 305 cfm (cubic feet per minute)
• As-cast finish
• Completely compatible with all existing 20-degree Brodix components
• Blended valve bowls
• Drilled accessory bolt holes
• Note:
  • Torque heads to 70 ft-lbs.
  • Torque rocker stands to 40-45 ft-lbs.
  • Spring pockets may Not be cut any larger or deeper than 1.750 in.
  • 4.600 in. minimum bore on the intake manifold

Recommended Related Components:

• Intake Gaskets: BRODIX MG 2021, FLATOUT FG 8275
• Head Gaskets: 4.600 – FEL-PRO 1057, COMETIC C5434
• Exhaust Gaskets: FEL-PRO 1412
• Valve Cover Gaskets: BRODIX MG 2020, FLATOUT FG 6108.3
• Head Studs: BRODIX SK HS SR 20 for BRODIX Aluminum Block, AR 235-4323 for Cast Iron Block
• Spark Plug Starting Points: NGK R5671A-10 for Alcohol, NGK R5671A-9 for Racing Gas
• Rocker Arms: JESEL or T&D Shaft System - JESEL KPS 441184, T&D 3142
• Valve Covers: MOROSO 68483
• Intake Manifolds: BM 2020 (Standard), BM 2021 (Tall Deck)
• Angle Milling: .0066 in. per cc
• Flat Milling: .0050 in. per cc
• Intake Valve Seats: 2.460 in. x .450 in.
• Exhaust Valve Seats: 1.900 in. x .450 in.
• Intake and Exhaust Valve Guides: BH 545 11/32 PL
• Standard lifters

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.

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