383 440 Impulse Race Heads

Produces up to 160hp more and costs 30% less than typical race heads

Impulse race heads are fully rebuilt cast-iron heads which are modified with our advanced air flow technology to produce 30% more torque and horsepower per dollar than ported aluminium heads or rebuilt cast-iron heads offered by other businesses.

383 440 Impulse Race Head Specs and Features

• Open Chamber
• 9:1 Compression Ratio
• High Flow Intake and Exhaust Ports
• Widened Intake Ports (near pushrod)
• Unshrouded Intake and Exhaust Valves
• Hardened Exhaust Seats
• Special 4 Angle Valve Job
• Special Pocket Porting
• HD Valve Springs (up to .700" lift)
• Valve Spring Retainers (chromemoly)
• Positive Valve Stem Seals (all rubber 2 ring type)
• Valve Stem Collets (hardened with reduced shoulders)
• K-Line Valve Guides
• Height of Valve Guides reduced to allow .700" lift
• New Brass Frost Plugs
• Cleaned & Crack Tested

383 440 Valves

• 2.14" Flat Head Intake
• 1.74" Tulip Head Exhaust