Skip to product information
1 of 1

NK Performance and Racing

210CC LS1 ENFORCER CYLINDER HEAD - SMALL BORE 5.3L

210CC LS1 ENFORCER CYLINDER HEAD - SMALL BORE 5.3L

Regular price $499.33 USD
Regular price Sale price $499.33 USD
Sale Sold out
Shipping calculated at checkout.
Style:

AFR's 210 LS1 Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head  is perfect for your OEM engine operating below 6300 RPM. They come fully assembled with the identical components found in our higher end CNC ported cylinder heads; such as PAC Racing springs, viton valve seals, machined bead valve locks (not stamped), hardened spring seats and our one piece 8mm 21 4N Stainless Steel valves. They are available without any parts for the DIY. Sold as a single piece, 2 are required per engine.  Please see footnotes for additional information. 


Included Components
As Cast Combustion Chambers
As Cast Exhaust Ports
As Cast Intake Ports
3-angle Valve Job

 
8mm Bead Lock Intake Valve 2.000” x 4.900” O.A.L.
8mm Bead Lock Exhaust Valve, 1.570” x 4.915" Overall Valve Length
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring,
140 lbs on seat, .600" maximum lift, Max RPM 6300-6500
7° Chrome Moly Retainers 1.245” O.D x .885” I.D x .655” I.D
7° Bead Lock Valve Keepers
Viton Valve Seals .620" O.D x .490" I.D
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D


210cc Street Head Flow Chart
  .200 .300 .400 .500 .550 .600
Int 136 199 246 272 276 265
Exh 93 140 180 204 211 215

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", 3/4" radius plate exhaust, 1 3/4" curved pipe

 

Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
210cc
Intake Port Dimension
3.190"H x 1.015"W x5/16 top 3/8" bottom
Intake Port Location
Stock
Exhaust Port Volume
82cc
Exhaust Port Dimension
1.400" H x 1.660" W
Exhaust Port Location
Stock
Combustion Chamber Size
64cc
Valve Angle
15°
Valve Spring Pocket Diameter
1.500" O.D
Max Valve Spring Pocket Machining
1.500" O.D
Warning:Do not machine spring pad any deeper.
Deck Thickness
0.425"
Minimum Bore Diameter
3.780""
Flat Mill
.006" per cc 58cc Maximum
Spark Plug Dimensions
14mm x .750" w/Tapered seat
CARB Status: THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THIS MEANS ANY PUBLIC PAVED OR UNPAVED ROADWAY OR IN A PUBLIC PARK. THESE PRODUCTS ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATION ARE SUBJECT TO A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS AND PROOF OF CORRECTION OF THE TAMPERING.
 
Recommended Components:
Head Gasket
Factory GM LS2
Intake Port Gasket
GM or FAST
Exhaust Port Gasket
GM#12558573
Head Bolts (97-03)
Head Studs (97-03)
Head Bolts (04+)
Head Studs (04+)
Head Bolt Washers, Manley
Suggested Manifold
FAST 90mm, 92mm, or 102mm
Spark Plug Starting Range
NGK TR55
View full details