AFR 3680 BBC 300/112CC .850 LIFT COMPLETE LOWEST PRICE ON EVERY PART NUMBER MADE
CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. Recommended for aggressive street, street/strip or race big block chevys with displacements up to 540 cubic inches operating at or below 6800 RPM. The 300cc oval port cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers; our 300cc oval port flows 388 CFM at 0.700" lift and is the ultimate street/race weapon without having to step up to a rectangular port design. 300cc Aluminum BBC Cylinder Heads Part # Description Combustion Chamber 3670 Fully CNC Ported - Hydraulic Roller 112cc 3680 Fully CNC Ported - Solid Roller 112cc Click part # to add product to your cart 300cc BBC .200 .300 .400 .500 .550 .600 .650 .700 Int 165 240 300 345 369 380 390 394 Exh 135 185 234 266 285 295 301 314 Test conducted at 28" of water (pressure) on Superflow 600Bore Size: 4.500", 3/4" radius plate exhaust, 1 7/8" curved pipe Included Components 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 100% CNC Ported Combustion Chambers Competition 5-angle Valve Job 11/32" Intake Valve, 2.300" x 5.500" O.A.L 7626 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length 7630 PAC Racing #1940 1.550??? OD Hydraulic Roller Dual Valve Spring 175 lbs. on seat, .725??? maximum lift, Max RPM 6500-6700 Uses #8511 Steel Retainer and #8048 Spring Cup 8002 PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600, Uses #8518 Steel Retainer (upgrades available) 8031 Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D AFR #8511 for spring #8002 Manley 10° Steel Retainers 1.500" O.D x 1.168" I.D x .844" I.D AFR #8518 for spring #8031 10° 11/32" Valve Locks with lashcap recess 9005 ARP 7/16" Rocker Exhaust Studs 6406 ARP 7/16" Rocker Intake Studs 6407 Adjustable 3/8" Guide Plates 6109 11/32" Viton Valve Seals 6610 Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D 8046 Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep 9065 Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep 9064 11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L 9047 11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L 9048 Recommended Components: Intake Port Gasket 6863 Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads. Exhaust Port Gasket 6858 Head Gasket, Fel-Pro #1047 (Mark V and VI) 6849 Head Gasket,, Fel-Pro #1017-1 (Mark IV) 6850 Head Bolts, ARP 135-3703 (Mark IV) 6306 Head Bolts, ARP 135-3707 (Mark V) 6308 Head Studs, ARP 235-4713 6307 Head Bolt Washers, Manley 6320 Stud Girdle, (AFR Specific) 6202 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) 6043 1.7 Shaft Mount Rocker Arms T&D 6065 Suggested Manifold Victor Jr Suggested Manifold RPM Performer Spark Plug Starting Range Autolite 3924 Specifications & Features: Material A356 Aluminum Intake Port Volume 300cc Intake Port Dimension 2.055"H x 1.840"W x1/2 Radius Intake Port Location Stock Exhaust Port Volume 135cc Exhaust Port Dimension 1.770"H x 2.010" W Exhaust Port Location .375" Raised Combustion Chamber Size(Full CNC) 112cc Valve Cover Bolt Pattern Perimeter Bolt Valve Angle 24°/4° Int, 15°/4° Exh Valve Spring Pocket Diameter 1.725" O.D Max Valve Spring Pocket Machining 1.750" O.D Deck Thickness .750" Minimum Bore Diameter 4.250" Flat Mill .006" per cc/ Maximum 102cc Angle Mill .009" per cc/ Maximum 97cc Note:Angle mills might require a .120" Thick intake gasket. Minimum Cross Sectional Area 3.020 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat SHIPS IN THE LOWER 48 STATES FREE! CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. CONTACT US THE PRICE IS NEGOTIABLE BEST OFFER Warning: May cause cancer and reproductive harm.