AFR 270cc Big Valve LS3 Cylinder Heads 1847

Name: AFR 270cc Big Valve LS3 Cylinder Heads
Brand: Airflow Research (AFR)
SKU: AFR-1847
Price: 3564.00 USD
Availability: InStock
Rating: 0 (0 reviews)

Write the First Review

Part Number: AFR-1847

$3,564.00

AFR 270cc Big Valve LS3 Cylinder Heads

Cylinder Heads, 270cc Big Valve LS3, Assembled, Aluminum, 69cc Chamber, Rectangular Port, for 4.00 in. and Larger Bore, Chevy, Small Block LS, Pair
See More Specifications | Check the Fit

AFR 270cc Big Valve LS3 Cylinder Heads 1847

AFR-1847

Not Yet Reviewed

Part Number: AFR-1847

Estimated Ship Date from OH, TX: Today

$3,564.00

Overview

Applications

Q&A

Instructions & Calculators

Estimated Ship Date from OH, TX: Today Would you rather pick it up?

Overview

Brand:

Airflow Research (AFR)

Manufacturer's Part Number:

1847

Part Type:

Cylinder Heads

Product Line:

AFR 270cc Big Valve LS3 Cylinder Heads

Summit Racing Part Number:

AFR-1847

Combustion Chamber Volume (cc):

Intake Runner Volume (cc):

270cc

Exhaust Runner Volume (cc):

93cc

Cylinder Head Style:

Assembled

Cylinder Head Material:

Cast aluminum

Camshaft Style:

Hydraulic roller

Intake Port Shape:

Rectangular

Intake Valve Diameter (in.):

2.200 in.

CNC-Machined Combustion Chamber:

Yes

CNC-Machined Intake Runner:

Yes

CNC-Machined Exhaust Runner:

Yes

Combustion Chamber Style:

Heart

Intake Port Location:

Standard

Exhaust Port Shape:

Oval

Exhaust Port Location:

Standard

Spark Plug Style:

Angle

Intake Valves Included:

Yes

Exhaust Valves Included:

Yes

Exhaust Valve Diameter (in.):

1.570 in.

Valve Springs Included:

Yes

Maximum Valve Lift (in.):

0.650 in.

Outside Diameter of Outer Spring (in.):

1.270 in.

Damper Spring Included:

Number of Springs Per Valve:

Dual

Retainers Included:

Yes

Retainer Material:

Titanium

Locks Included:

Yes

Lock Style:

7 degree

Valve Stem Seals Included:

Yes

Valve Stem Seal Style:

Positive stop

Rocker Arm Studs Included:

Rocker Arms Included:

Rocker Arm Nuts Included:

Guideplates Included:

Valve Cover Mounting Style:

Centerbolt

Accessory Bolt Holes Drilled:

Yes

Intake Valve Angle:

Exhaust Valve Angle:

Valve Guides Included:

Yes

Valve Guide Material:

Bronze

Valve Seats Machined:

Yes

Valve Seat Machine Style:

5-angle

Valve Seat Material:

Ductile iron

Cylinder Head Color:

Natural

Finish:

Natural

Steam Holes Drilled:

Oiling Style:

Through pushrod

Machined for O-Ring:

Heat Crossover:

Remanufactured:

Quantity:

Sold as a pair.

Notes:

For 4.00 in. and larger cylinder bore. 6 bolt head. Do not machine spring pad any deeper per manufacturer.

AFR 270cc Big Valve LS3 Cylinder Heads

AFR 270cc Big Valve LS3 cylinder heads are engineered for builders who demand maximum airflow, strength, and head gasket stability from their LS3 or rectangle port engine. Featuring 270cc CNC ported intake runners, 93cc exhaust ports, and a large 2.200 inch intake valve, this head significantly increases curtain area and charge efficiency to deliver strong mid range torque and sustained top end power. Designed around a 6 bolt configuration for improved clamping force under high cylinder pressures, it's an ideal choice for high compression, forced induction, or nitrous assisted builds, while a 4 bolt version is available for traditional LS applications. Each head is fully CNC ported throughout the intake, exhaust, and 69cc combustion chambers, assembled with premium components including a competition 5 angle valve job, Pacaloy hydraulic roller springs, titanium retainers, and bronze valve guides, all cast from A356 aluminum for durability and heat control. Whether you're building a big cube stroker or a boosted LS combination, the AFR 270cc Big Valve LS3 cylinder head provides the airflow capacity, consistency, and sealing strategy needed to support serious horsepower as your build evolves.

Applications