AFR 3680 BBC 300/112CC .850 LIFT COMPLETE LOWEST PRICE ON EVERY PART NUMBER MADE

Regular price $ 3,326.75

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

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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 600
Bore 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
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

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CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.

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Warning: May cause cancer and reproductive harm.