Trick Flow Specialties
Oval Port Aluminum 280cc BBC Cylinder head
Trick Flow also has a few big-block cylinder heads, but we will focus on its premier budget cylinder head, the oval port aluminum version. It helps build great low- to mid-range horsepower. These heads have 280cc intake runners and 113cc combustion chambers. An assembled set of these heads runs approximately $1,925.
Powerhouse Engine Components
Cast Aluminum 320cc BBC Cylinder Head
Powerhouse surprised us with a set of cast aluminum big-block heads that feature 320cc intake runners and 115cc combustion chambers. The intake and exhaust valves measure in at 2.25 and 1.88 respectively. These heads are assembled for hydraulic flat tapped lifters, and upgrades are available, so give them a call. An assembled set from Powerhouse will cost $1199.
Going Back To Last Month
Editor's note: Due to circumstances beyond our control, the following text and photos from part 1 of this story (which dealt with small-block cylinder heads) were left out of the May issue. Here is the conclusion of Head Trip, Part 1, in its entirety. We apologize for the error.
High-flow 197cc Aluminum SBC Cylinder Heads, 220cc Aluminum SBC Cylinder Heads
These heads are designed to support 425-500 hp in 350-406ci engines. They feature large, high quality stainless steel 2.055-inch intake and 1.600 exhaust valves. According to Jegs, the intake port cross-section was designed for good mid-range power. The heads work well with cams featuring duration of 210-240? @ .050 inches. 197cc Intake runners, 1.440-inch springs, 1.875-inch installed height, 130-pound seat pressure, 3/8-inch studs, and 5/16-inch guideplates included; 2.055-inch intake/1.600-inch exhaust. Cost: $1,118 (197cc head).
Jegs also has a 220cc high-flowing aluminum head. It features 220cc intake runners, 240 pounds seat pressure, .680-inch maximum lift, 64cc CNC-machined combustion chambers with angle plug design, 10? locks, steel retainers and bronze guides, 2.100-inch intake and 1.600-inch exhaust stainless steel valves, 7/16-inch rocker studs and 5/16-inch guide plates. Cost: $1,372 (220cc head).
Summit Racing Equipment
Summit 170cc Cast-iron Vortec SBC Cylinder Head, Summit Street & Strip 200cc Aluminum SBC Cylinder Head
Are you looking for a good set of heads to up the performance factor of your Vortec engine? Summit Performance Vortec cylinder heads have what it takes to get the job done. Featuring wide-open intake runners, efficient combustion chambers, and a high-performance valve job, these heads deliver plenty of power-building airflow. Made from superior iron alloy, these heads come ready-to-run for improved performance straight out of the box.
Specs: cast iron cylinder head material; combustion chamber volume 67cc; intake runner volume 170cc; intake valve diameter 1.940 inches; exhaust valve diameter 1.500 inches; maximum valve lift 0.520 inches; outside diameter of outer spring 1.250 inches. Cost: $649 (both 170cc and 200cc).
Trick Flow Specialties
Trick Flow 195cc Aluminum SBC Cylinder Head
Dyno-tested on a 383ci engine, Trick Flow's 64cc 23? 195cc aluminum cylinder heads made 460 hp and 451 lb-ft of torque-40 more horsepower and 11 lb-ft more torque than the same engine with GM L98 Corvette heads. The 195 heads are a direct fit, high-performance replacement for most original equipment factory heads, and accept most factory accessories. They feature a choice of 62cc as-cast, or 64cc and 72cc CNC-profiled combustion chambers, 2.02/1.60 stainless steel valves, hardened exhaust valve seats for unleaded gas, and 195cc intake ports with a high-velocity, small cross-section design to promote low-rpm torque without sacrificing higher-rpm horsepower. The heads are available with three spring sizes: 1.250-inch single for cams up to .480-inch lift; 1.470-inch single for cams up to .540-inch lift; and 1.460-inch dual for cams up to .600-inch lift. They come fully assembled with valves, valve springs, locks, retainers, rocker arm studs, and guideplates. The heads are 50-state emissions-legal under CARB E.O. number D-369-4. Cost: approximately $1,249 (assembled).
Performer 170cc Aluminum SBC Cylinder heads
The key to any successful engine buildup lies in using parts that work together, and Performer RPM cylinder heads are designed specifically for street-driven cars with moderate compression and pump gas. The high velocity 170cc intake ports produce outstanding throttle response and torque, with enough air flow to produce over 400 hp when used with matching a Performer RPM manifold, cam, and carb. The Performer RPM head #60899 comes fully assembled and ready to run with 2.02/1.60-inch stainless steel valves; valve springs rated up to .575-inch lift; 64cc combustion chambers; 60cc exhaust ports; and straight spark plugs for use with standard exhaust headers. Performer RPM small-block Chevy heads are also available bare, or complete with 70cc combustion chambers and angled spark plugs. Like all Edelbrock heads, they're cast at the Edelbrock Foundry from 356-T6 aluminum and incorporate Heli-Coil inserts in the rocker stud and exhaust bolt holes for strength and durability. Cost: The MSRP is $1,648, but check with your local Edelbrock dealer for more info.