AFR 377cc BBC Rectangle Port Cylinder Head

Best suited for +540 cubic inch large displacement big block chevy racing engines, operating at or below 7600 RPM. Our 37cc cylinder heads feature fully CNC machined intake runners, exhaust ports and combustion chambers. Equipped with Titanium retainers and high quality components, these heads are capable of flowing 437 CFM at 0.900" of lift.

 

Included Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5 Angle Valve Job

 
11/32" Intake Valve, 2.300" x5.500" O.A.L

AFR #7626

11/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L

AFR #7631

PAC Racing #1224 1.625” OD Solid Roller Dual Valve Spring 275 lbs. on seat, .850” maximum lift, Max RPM 7400-7600 (upgrades available)

AFR #8031

10° Titanium Retainer 1.500" O.D x 1.180" I.D x .765" I.D

AFR #8507

10° 11/32” Valve Keepers with lashcap recess

AFR #9005

ARP 7/16” Rocker Studs Intake

AFR #6407

ARP 7/16” Rocker Studs Exhaust

AFR #6406

Adjustable 3/8" Guide Plates

AFR #6109

11/32" Viton Valve Seals

AFR #6613

Hardened Spring Cup 1.740" O.D / 1.650" I.D

AFR #8046

Intake Valve Seats 2.450" O.D x 2.000" I.D x .375" Deep

AFR #9065

Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep

AFR #9064

11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L

AFR #9041

11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L

AFR #9042

 

377cc Competition Flow Chart
  .200 .300 .400 .500 .600 .700 .800 .900
Int 168 247 311 355 405 420 429 432
Exh 134 190 240 280 299 308 314 319

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.600", intake 3/4" radius plate exhaust, 2 1/8" curved pipe

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