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 Super 23® 175 Cylinder Heads for Small Block Chevrolet Trick Flow® Super 23® 175 cylinder heads vastly outperform factory small block Chevy heads on 283-350 c.i.d. engines. They feature small cross section, Fast as Cast® runners for excellent port velocity to promote low-end torque and a profi le that delivers outstanding fl ow for making ample high RPM horsepower on small bore engines. Modern CNC-profi led chambers promote combustion effi ciency. That helps maximize power with less ignition timing and reduces the potential for detonation. It all adds up to more power, better drivability, and greater throttle response on street performance engines. Improved A356-T61 castings now feature 3/4" thick decks for additional strength and durability. Other features include a competition multi-angle valve job, angled spark plugs, and raised valve cover rails for improved rocker arm clearance and less potential for oil leaks. Assembled cylinder heads have premium components including stainless steel valves, bronze valve guides, 7° machined locks, and chromoly retainers. Several PAC Racing valve spring options are available for fl at tappet and hydraulic roller cams. Trick Flow® Super 23® 175 heads accept most original accessories. They are emissions-legal under CARB E.O. #D-747-1 for 1995 and earlier GM vehicles with Chevy 262–350 engines. Cylinder heads are available fully assembled or as bare castings. Sold individually. Super 23 175 Heads, Fast As Cast Runners, Assembled TFS-30310001 1.250" single valve springs, perimeter bolt valve covers, 175cc intake runners TFS-30310002 1.470" single valve springs, perimeter bolt valve covers, 175cc intake runners TFS-30310003 1.460" dual valve springs, perimeter bolt valve covers, 175cc intake runners TFS-30310005 1.250" single valve springs, center bolt valve covers, 175cc intake runners TFS-30310006 1.470" single valve springs, center bolt valve covers, 175cc intake runners TFS-30310007 1.460" dual valve springs, center bolt valve covers, 175cc intake runners Airfl ow Results Super 23 175 Lift Value Intake Flow CFM Exhaust Flow CFM .100" 62 57 .200" 127 109 .300" 180 142 .400" 219 167 .500" 242 181 .600" 245 192 Tests conducted at 28" of water (pressure). Bore size: 4.030"; exhaust with 13⁄4" pipe. Specifi cations Material: A356-T61 aluminum Combustion Chamber Volume: 56cc standard Intake Port Volume: 175cc Fast As Cast Intake Port Location: Stock Intake Port Dimensions: 1.230" x 1.990" Intake Gaskets: Fel-Pro 1256 Intake Valve Diameter: 1.940" (TFS-30300211) Intake Valve Seat: Ductile iron (TFS-30300271) Exhaust Port Volume: 67cc Fast As Cast Exhaust Port Location: Stock Exhaust Port Dimensions: 1.300" x 1.350" D-shape Exhaust Gaskets: Fel-Pro 1404 Exhaust Valve Diameter: 1.500" (TFS-30300212) Exhaust Valve Seat: Ductile iron (TFS-30300272) Valve Angles: 23° Valve Guide Material: Bronze alloy (intake TFS-51400252-1, exhaust (TFS-30400252-1) Valve Seals: Viton® fl uoroelastomer (TFS-51400454) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.615"; 1.500" for two center valve springs Valve Spring Cups: 1.270" (TFS-31400433) 1.480" (TFS-51400434) Valve Spring Retainers: 7° x 1.250" o.d. chromoly steel (TFS-31400423) 7° x 1.460" o.d. chromoly steel (TFS-31400424) 7° x 1.470" o.d. chromoly steel (TFS-51400423) Valve Stem Locks: 7° machined steel (TFS-51400444) Valve Springs, Standard: 1.250" o.d. single spring with damper (TFS-16314-16) 110 lbs. @ 1.780" installed height 300 lbs. @ 1.280" open 360 lbs. per inch rate .520" maximum valve lift Valve Springs, Option 1: 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" maximum valve lift Valve Springs, Option 2: 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" maximum valve lift Guideplates: 5/16" (TFS-30400623-8) Rocker Arm Studs: 3/8" (TFS-51400613) Rocker Arms: TFS-31400510 (1.5 ratio, 3/8" studs) TFS-31400511 (1.6 ratio, 3/8" studs) Minimum Bore Diameter: 3.736" Cylinder Head Bolts: TFS-92000 Head Gaskets: TFS-30494060-040 Pushrod Length: Longer than stock required Spark Plugs: NGK FR5 or Autolite 3924 NOTE: Must use 350 or larger head gasket on 305 engines. Viton® is a registered trademark of DuPont Performance Elastomers. options are available for fl at tappet and hydraulic roller cams. Trick Flow® Super 23 ® Super 23 ® ® 175 heads accept most original accessories. ® 175 heads accept most original accessories. ® They are emissions-legal under CARB E.O. #D-747-1 for 1995 and earlier GM vehicles with Chevy 262–350 engines. Trick Flow Fast As Cast® Cylinder Heads— Great Performance at an As-Cast Price! Not everyone needs the all-out airfl ow capability of a Trick Flow CNC-ported cylinder head. But you can get plenty of power-building airfl ow with Trick Flow’s Fast As Cast® cylinder heads—and for about the same price as the “other guy’s” ordinary cast heads. To create a Fast As Cast® cylinder head, our engineers digitize the intake and exhaust runners from a fully CNC-ported Trick Flow cylinder head. Those digitized profi les allow us to make a high-fl ow cylinder head without costly CNC- porting. That means Trick Flow Fast As Cast® cylinder heads outfl ow any ordinary cast head available—and even rival some of our competitor’s CNC-ported heads. You get great performance at a very affordable price! Fast As Cast® cylinder heads—Ultimate Bolt-On Performance!TM Intake Side TFS-30310007
