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AFR LS3 270cc Aluminum Cylinder Heads, 69cc Chambers, 4 Bolt with Parts
AFR 1847-4
AFR’s 270cc LS3 big-valve heads feature 100% CNC ported intake, exhaust and chambers using our advanced engineering and flow techniques to produce the ultimate Rectangle Port head available today. The 2.200" intake valve increases curtain area and intake charge efficiency, supporting strong mid-range and sustained top-end. Designed around the 4-bolt pattern for those straightforward fitments on traditional LS blocks and gaskets. Whether naturally aspirated or on the sauce, this head gives your LS3 the breathing capacity and sealing strategy to grow with your tune.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Pricing:
$3,564.00
Description
| 260cc Aluminum LS1 Cylinder Heads | ||
| Part # | Description | Combustion Chamber |
| 1847 | CNC Ported w/parts 6 Bolts | 69cc |
| 1847-4 | CNC Ported w/parts 4 Bolts | 69cc |
| 270cc Street Head Flow Chart | |||||||
| .200 | .300 | .400 | .500 | .600 | .650 | .700 | |
| Intake | 159 | 236 | 299 | 344 | 376 | 384 | 389 |
| Exhaust | 116 | 166 | 211 | 230 | 238 | 242 | 245 |
| Basic Package Components | Part # |
| 100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports Competition 5-angle Valve Job |
|
| 8mm LS3 Solid Stem 2.200 Intake , 5.200 OAL | AFR #7215 |
| 8mm LS3 Solid Stem 1.570 Exh Valve, 5.205 OAL | AFR #7217 |
| Pacaloy Hydraulic Roller Spring 1.270 O.D., Premium Grade Chrome Silicon, Max RPM 7000-7200 | AFR #8019 |
| Rocker Rail Stand |
AFR #6040
|
| LS1 Titanium 7 degree Retainer 1.250 OD x .885 ID x .655 | AFR #8512 |
| LS1 7 degree Machined Hardened Steel Valve Locks - Stock Style Bead Lock | AFR #9007* |
| 8mm SBC, SBF, LS1 Viton Rubber Valve Stem Seal, .600 OD x .495 ID | AFR #6612 |
| O.D. Spring Cup 1.380 OD x 1.300 ID x .570 ID (Fits 8017 &8019 spring) | AFR #8042 |
| AFR SB Chevy & LS3 Intake Seat 2.200 OD x 1.750 ID x .375 | AFR #9060 |
| AFR SB Ford/LS1/LS3 Exhaust Seat 1.650 OD x 1.350 ID x .375 | AFR #9069 |
| LS3 8mm Bronze Guide, .502 OD | AFR #9053 |
| Specifications, Features, and Optional Supporting Components |
| Intake Port Gasket |
Factory GM or Aftermarket
|
| Exhaust Port Gasket |
GM #12558573
|
| Recommend Rockers |
Scorpion 1162
|
| Head Gasket |
Cometic 4.160 Bore Size
|
| Head Bolts (04+), ARP 134-3610 | AFR #6334 |
| Head Studs (04+), ARP 234-4317 | AFR #6335 |
| Head Bolt Washers, Manley | AFR #6320 |
| Suggested Manifold | FAST 92mm, or 102mm |
| Spark Plug Starting Range |
NGK TR55
|
| Material |
A356 Aluminum
|
| Intake Port Volume | 270cc |
| Valve Spring Lift |
.650" Lift
|
| Intake Port Dimension |
2.610"H x 1.300"W x 7/16° Radius
|
| Intake Port Location | Stock |
| Exhaust Port Volume | 93cc |
| Exhaust Port Dimension |
1.540" H x 1.760" W
|
| Exhaust Port Location | Stock |
| Combustion Chamber Size |
69cc
|
| Valve Cover Bolt Pattern |
Center Bolt
|
| Valve Spring Pocket Diameter |
1.490" O.D
|
| Max Valve Spring Pocket Machining |
1.510" O.D
|
| Deck Thickness |
.750"
|
| Valve Angle |
Valve Angle 12°
|
| Flat Mill - 65cc chamber |
.006" per cc 62cc Maximum
|
| Minimum Bore Diameter |
4.000"
|
| Minimum Cross Sectional Area |
3.00 sq. in.
|
| Spark Plug Dimensions |
14mm x .750" w/Gasket Seat
|
Details
- AFR 1847-4
- AFR 1847-4
- Air Flow Research
- New
Categories
Shipping Information
- Item Requires Shipping
- 65.0 lbs.
- W12.0000” x H12.0000” x L24.0000”
- Free Basic Shipping
- This item ships in its own box.
- FREE continental USA ground shipping on ALL AFR Cylinder Heads
- TRE Performance Difference
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