Some parts are not legal for sale or use in California or other states with similar laws/regulations—see pg. 2 for details. WARNING: For Proposition 65 information, see pg. 2 DHC™ 200 Cylinder Heads for Small Block Chevrolet Specifications Material: A356-T61 aluminum Combustion Chamber Volume: 64cc CNC-profiled Intake Port Volume: 200cc CNC Street Ported Intake Port Location: Stock Intake Port Dimensions: 1.280" x 2.090" Intake Gaskets: Fel-Pro 1205 Intake Valve Diameter: 2.055" (TFS-30200211) Intake Valve Seat: Ductile iron (TFS-51400271) Exhaust Port Volume: 74cc CNC Street Ported Exhaust Port Location: Stock Exhaust Port Dimensions: 1.300" x 1.500" Exhaust Gaskets: Fel-Pro 1404 Exhaust Valve Diameter: 1.600" (TFS-30200212) Exhaust Valve Seat: Ductile iron (TFS-51400272-1) Valve Angles: 23° Valve Guide Material: Bronze alloy (intake TFS-51600252, exhaust (TFS-51600251) Valve Seals: Viton® fluoroelastomer (TFS-30400454) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.615"; 1.500" for two center valve springs Valve Spring Cups: 1.480" (TFS-51400434) Valve Spring Shims: 1.460" (TFS-31500432) Valve Spring Retainers: 7° x 1.500" o.d. chromoly steel (TFS-31400424) Valve Stem Locks: 7° machined steel (TFS-31400444) Valve Springs, Standard: 1.470" o.d. single spring with damper (TFS-16514-16) 118 lbs. @ 1.800" installed height 300 lbs. @ 1.280" open 360 lbs. per inch rate .540" max. valve lift Valve Springs, Option 1: 1.460" o.d. dual spring with damper (TFS-16315-16) 134 lbs. @ 1.800" installed height 405 lbs. @ 1.200" open 452 lbs. per inch rate .600" max. valve lift Guideplates: 5/16" (TFS-30400623-8) Rocker Arm Studs: 7/16" (TFS-51400614) Rocker Arms: TFS-31400520 (1.5 ratio, 7/16" studs) TFS-31400521 (1.6 ratio, 7/16" studs) Minimum Bore Diameter: 4.000" Cylinder Head Bolts: TFS-92000 Head Gaskets: TFS-30494060-040 Pushrod Length: Longer than stock required Spark Plugs: Autolite 3924 or 4252 (13/16" hex) NOTE: These heads have straight spark plug holes. Viton® is a registered trademark of DuPont Performance Elastomers. You want to wring the most performance out of your vintage-style small block Chevy, but your buddies can spot modern cylinder heads from a mile away, even when hidden under a healthy dose of Chevy Orange paint. What to do? Bolt up a set of Trick Flow DHC 200 cylinder heads! Patterned after Trick Flow’s popular DHC 175 as-cast heads, the DHC 200 heads have exterior touches like straight spark plug holes and double hump styling like the legendary OE heads. But on the inside, it’s all modern CNC-ported goodness. The heads are cast from A356-T61 aluminum, so they’ll weigh substantially less than cast iron. New 64cc CNC-profiled combustion chambers with 2.055" intake valves and CNC Street Porting promote big increases in high-RPM horsepower and torque. Bronze alloy valve guides, ductile iron valve seats, and stainless steel valves ensure excellent durability, while the proprietary valve profiles and multi-angle valve seat machining maximize flow at low lift. Extra thick decks and walls increase casting strength for peace of mind in demanding conditions. Chromoly steel retainers, 7° machined steel valve locks, factory intake and exhaust port locations, and your choice of Trick Flow by PAC Racing valve springs round out the features. In keeping with the vintage-style design, the heads will be available with or without accessory bolt holes cast into them so you’re sure to find a set that’ll deliver the classic Chevy look you’re going for. Sold individually. DHC 200 Heads, CNC Street Ported Runners, Assembled TFS-30210002-C00 1.470" single valve springs, no accessory bolt holes, 200cc intake runners TFS-30210003-C00 1.460" dual valve springs, no accessory bolt holes, 200cc intake runners TFS-30210006-C00 1.470" single valve springs, with accessory bolt holes, 200cc intake runners TFS-30210007-C00 1.460" dual valve springs, with accessory bolt holes, 200cc intake runners Airflow Results DHC 200 Lift Value Intake Flow CFM Exhaust Flow CFM .100" 68 56 .200" 140 109 .300" 200 148 .400" 244 180 .500" 275 204 .600" 286 217 .700" 290 227 Tests conducted at 28" of water (pressure). Bore size: 4.030"; exhaust with 17⁄8" pipe. Dyno Results DHC 200 Test Engine: 10.2:1 compression 384 c.i.d. with Trick Flow DHC™ 200 cylinder heads (TFS-30210003-C00), Trick Flow Track Max™ hydraulic roller camshaft (TFS-31402002), 1.6 ratio roller rocker arms, Trick Flow chromoly pushrods, Edelbrock Victor Jr. intake manifold, 750 cfm carburetor, Hooker Super Competition headers with 1¾" primaries, 3" dual exhaust with Flowmaster mufflers. TFS-30210002-C00 Get Sleeper Looks and Modern Performance with Trick Flow DHC™ 200 Heads! If you’re one of those guys that like to be sneaky, DHC 200 heads are perfect for you. While they may look like old double-hump “fuelie” heads from the 1960s on the outside, it’s all 21st century tech on the inside. With a little orange paint you can pass off your sleeper build and as a stock 225 horsepower mill, when it’s easily making double that amount of power or more. Check out this video to see what a pair of DHC 200 heads did on L79-looking, 400 cubic inch small block destined for a 1967 Corvette.
