AFR 2020 BBC 385/121CC .725/.850 COMPLETE WITH HYDRAULIC OR SOLID ROLLER SPRINGS

Regular price $ 3,641.85

CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.

Our largest and best flowing big block chevy cylinders heads, these cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers. Best suited for +540 cubic inch large displacement racing engines, operating at or below 7600 RPM. Equipped with Titantium retainers and high quality components, these heads are capable of flowing 456 CFM at 0.900" of lift.

385cc Aluminum BBC Cylinder Heads
Part # Description Combustion Chamber
2020-TI Fully CNC Ported 121cc

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385cc BBC
  .200 .300 .400 .500 .600 .700 .800 .900
Int 176 256 327 386 421 444 452 456
Exh 149 205 267 302 322 334 344 350

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.600", 3/4" radius plate exhaust, 2 1/8" curved pipe

Basic Package Components
100% CNC Ported Intake Ports, Exhaust Ports, & Combustion Chamber
Competition 5-angle Valve Job
11/32" Intake Valve, 2.350" x 5.500" O.A.L
7627
11/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L
7631
PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600
8031
10° Titanium Retainer 1.500" O.D x 1.180" I.D x .765" I.D
8507
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
AFR #6613
Hardened Spring Cup 1.740" O.D / 1.650" I.D
8046
Intake Valve Seats 2.450" O.D x 2.000" 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
AFR #9041
11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L
AFR #9042
Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
385cc
Intake Port Dimension
2.565"H x 1.810"W x 15/32 Radius
Intake Port Location
Stock
Exhaust Port Volume
135cc
Exhaust Port Dimension
1.780"H x 2.025" W
Exhaust Port Location
.375" Raised
Combustion Chamber Size(Full CNC)
121cc
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 114cc
Angle Mill
.009" per cc/Maximum 104cc
Note:Angle mills might require a .120" Thick intake gasket.
Minimum Cross Sectional Area
3.890 sq. in.
Spark Plug Dimensions
14mm x .750" w/Gasket Seat

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Warning: May cause cancer and reproductive harm.