SLP AFR Cylinder Heads
Company: SLP Performance Parts
Intake cc: 225
Chamber cc: 62
Approximate Compression: 10.7:1
SLP has teamed up with AFR to bring these CNC-ported street/strip heads to the market. Despite features such as 2.08-inch intake valves and 1.60-inch exhaust valves, they are fully emissions legal--even in California. Flowing up to 320 cfm at 0.600-inch lift, these heads are fully assembled, ready to bolt on, and ready to make power! Like with all AFR head castings, these heads have many high-durability features, like reinforced rocker stud bosses and interlocking ductile iron valve seats. $2,649 makes them yours.
Race Prep Phase IIILSR Heads
Company: Race Prep Performance Engineering
Intake cc: Customer-specified
Chamber cc: 66
Approximate Compression: 10.2:1
Using factory 6.0L castings, Race Prep's Stage IIILSR heads get their chambers welded, cryogenically treated, and machined to accept larger valves, yielding a more efficient chamber design and 340-cfm flow figures. This is a full race package, and thermal barrier coatings on the chambers and valves can be had as well. This full package goes for $3,675. Race Prep prides itself on offering the customer exactly what they need for their application and not just something "off-the-shelf," and larger chamber sizes are available. The company also offers ported AFR castings that will outflow even the Stage IIILSR heads.
TEA Stage 1.5 5.3 Heads
Company: Total Engine Airflow
Intake cc: Customer-specified
Chamber cc: Customer-specified
Approximate Compression: Customer-specified
Total Engine Airflow's biggest mover is its ported Stage 1.5 5.3 head. Designed for a 3.90-inch bore, these heads get a blended competition multi-angle valve job, Ferrea 2.02-inch intake valves, and TEA 0.650-inch lift dual valvesprings (COMP Cams springs are optional). The price of $1,575 includes new GM head castings. Choose from stock exhaust valves or REV 1.57 inchers. Or, select from TEA's Stage 1, 2, or 3 cylinder head packages.
More Performance Profiler
Company: More Performance
Intake cc: TBA
Chamber cc: TBA
Compression: TBA
More Performance's brand-new Profiler head flows nearly 330 cfm on the intake as-cast and can be ported for even higher flow numbers based on a particular engine application. In fact, by virtue of its extra-thick port walls, the head converts into a C5R head; that is, it can be ported all the way to C5R valve angles and flow up to 400 cfm. Other features of the head include raised valve cover rails and dual valve cover bolt patterns for both pre-'99 and '99-and-later applications. Details on this head, including pricing, are still being worked out as of print time, so check its Web site for more information, as well as other products More Performance markets.
RGR Performance Stage 2 Heads
Company: Speed Inc.
Intake cc: 243
Chamber cc: Customer-specified
Approximate Compression: Customer-specified
Hand-ported by Rich Groh Racing exclusively for Speed Inc., these heads feature 2.02-inch intake and 1.57-inch exhaust valves, along with titanium retainers. A lightweight valve option is also available for a slight charge. Speed Inc. relies on these heads for many of its own projects, as well as record-breaking customer build ups. Though it admits the lead-time will be longer to procure a set of these RGR heads than some of the CNC units offered, Speed Inc. claims the results are always worth the wait. They'll go for $1,799 on an exchange basis.
Katech Stage III 2.100-inch LS6 Cylinder Head Assembly
Company: Katech Engine Building and Development
Intake cc: 240
Chamber cc: Customer-specified
Approximate Compression: Customer-specified
Katech says the 2.100-inch hollow-stem intake valves are the secret to this head's awesome across-the-board flow numbers. Though they can only be used on engines with at least a 4-inch bore, these heads will provide 330 cfm of flow at only 0.600-inch lift, and their modest intake port volume will preserve mid-range torque. Katech says the countless hours it put into CNC machine programming has resulted in a 100 percent repeatable intake port that cleans up perfectly on the machine and doesn't require hand finishing, thereby assuring each intake port flows identical numbers. Pricing on this head is $2,759.
West Coast Cylinder Heads Stage 2 6.0L Heads
Company: West Coast Racing Cylinder Heads
Intake cc: 233
Chamber cc: 74
Approximate Compression: 9.4:1
With 2.02 and 1.57-inch valves, West Coast's ported 6.0 heads flow just under 300 cfm at 0.600-inch lift. Its large combustion chamber drops compression for blown LS1 applications. Many custom options are available, and West Coast is constantly updating its CNC profiles to maximize performance in specialized applications. Several other heads are available as a starting point, and coming soon are CNC porting profiles for the new Edelbrock head castings. Please call for the most up-to-date pricing.
TTP Stage 4R AFR 225cc CNC Heads
Company: TT Performance Parts
Intake cc: 225
Chamber cc: Customer-specified
Approximate Compression: Customer-specified
TT Performance Parts starts off with AFR's 225 CNC heads and does its own special in-house porting job to achieve what the company claims are record-breaking flow and horsepower numbers. A '98 Camaro equipped with one of TTP's Equalizer head and cam packages included a set of these heads and made 505 hp at the rear wheels, even with the stock bottom end. This easily put the customer's previously installed head and cam package to shame. Several other head packages are available, all starting with the solid foundation of AFR heads. Call TTP for current pricing.