Twisted Wedge® 170 Cylinder Heads for Small Block Ford 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 Specifi cations Material: A356-T61 Aluminum Combustion Chamber Volume: M58: 58cc CNC-profi led M61: 61cc CNC-profi led Intake Port Volume: 170cc Fast As Cast Intake Port Location: Stock Intake Port Dimensions: 1.200" x 2.000" Intake Gaskets: Fel-Pro 1250 Intake Valve Diameter: 2.020" (TFS-51400211) Intake Valve Seat: Ductile iron (TFS-51400271) Exhaust Port Volume: 66cc Fast As Cast Exhaust Port Location: Stock Exhaust Port Dimensions: 1.250" x 1.500" Exhaust Gaskets: Fel-Pro 1415 Exhaust Valve Diameter: 1.600" (TFS-51400212) Exhaust Valve Seat: Ductile iron (TFS-51400272-1) Valve Angles: Intake 15°, exhaust 17° Valve Guide Material: Bronze alloy (TFS-51400252) Valve Seals: Viton® fl uoroelastomer (TFS-30400454) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.615" Valve Spring Cups: 1.480" (TFS-51400434) Valve Spring Retainers: 7° x 1.500" o.d. chromoly steel (TFS-51400423) 10° x 1.500" o.d. chromoly steel (TFS-21400424) Valve Stem Locks: 7° machined steel (TFS-51400444) 10° machined steel with lash cap recess (TFS-52400444) Valve Springs, Standard: 1.470" o.d. single spring with damper (TFS-16514-16) 118 lbs. @ 1.800" installed height 305 lbs. @ 1.260" open 360 lbs. per inch rate .540" maximum valve lift Valve Springs, Optional: 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-51400623) 3/8" (TFS-51400624) Rocker Arm Studs: 02/04: 3/8" (TFS-51400613) 10: 7/16" (TFS-51400614) Rocker Arms: TFS-51400510 (1.6 ratio, 3/8" studs) TFS-51400511 (1.72 ratio, 3/8" studs) TFS-51400520 (1.6 ratio, 7/16" studs) TFS-51400521 (1.72 ratio, 7/16" studs) Minimum Bore Diameter: 4.000" Cylinder Head Bolts: TFS-92005 Head Gaskets: TFS-51494030-040 or TFS-51494060-040 Pushrod Length: Longer than stock required Spark Plugs: Autolite 3924 NOTES: Valve cover rail is raised .350" over stock height. 61cc combustion chamber heads work with stock pistons and performance camshafts up to .550" lift. 58cc combustion chamber heads require Twisted Wedge specifi c pistons for proper piston-to-valve clearance. Viton® is a registered trademark of DuPont Performance Elastomers. Dyno Results Twisted Wedge 170 Test Engine: 9.5:1 compression 306 c.i.d. with Trick Flow Twisted Wedge 170 cylinder heads (TFS-51410004-M61), Trick Flow Track Max® hydraulic roller camshaft (TFS-51403001), Trick Flow StreetBurner® EFI intake manifold (TFS-51500001), Trick Flow TFX™ 70mm throttle body (TFS-24070), Trick Flow TFX™ 24 lb./hr. fuel injectors (TFS-89024), Hooker Competition headers with 13⁄4" primaries, 3" dual exhaust with Flowmaster muffl ers. Trick Flow’s legendary Twisted Wedge 170 series cylinder heads are better than ever! Their updated A356-T61 machined castings come straight from Trick Flow’s 11R series head lineup, adding increased strength from the .625" thick deck and a great-looking, billet-like appearance. It’s Twisted Wedge combustion chamber moves the intake valves away from the cylinder walls to reduce valve shrouding and drastically enhance high- lift fl ow. Altered 15° intake/17° exhaust valve angles tighten the combustion chamber to increase compression while improving piston-to-valve clearance for using higher lift cams with stock pistons. CNC-profi led combustion chambers with relocated spark plugs boost combustion effi ciency, extracting more power with less ignition timing and reducing the potential for detonation. The choice of 58cc or 61cc combustion chamber volumes allow builders to dial-in the perfect compression ratio. High-effi ciency, Fast As Cast® runners feature a competition level, multi-angle valve job for near-CNC-ported power and airfl ow at cast head prices. Assembled Twisted Wedge 170 cylinder heads are ready-to-run as delivered with top-quality valvetrain components installed to ensure great durability and longevity. Some Twisted Wedge 170 cylinder heads are emissions-legal under CARB E.O. #D-747-1 for 1996 and earlier Ford 289, 302, and 351W engines. Cylinder heads are available fully assembled or as bare castings. Sold individually. Twisted Wedge 170 Heads, Emissions Legal, Fast As Cast Runners, Assembled TFS-51410002-M58 58cc combustion chambers and 1.470" single valve springs, 170cc intake runners TFS-51410002-M61 61cc combustion chambers and 1.470" single valve springs, 170cc intake runners TFS-51410004-M58 58cc combustion chambers and 1.460" dual valve springs, 170cc intake runners TFS-51410004-M61 61cc combustion chambers and 1.460" dual valve springs, 170cc intake runners Twisted Wedge 170 Heads, Non-Emissions, Fast As Cast Runners, Assembled TFS-51410010-M58 58cc combustion chambers and 1.460" dual valve springs, 170cc intake runners TFS-51410010-M61 61cc combustion chambers and 1.460" dual valve springs, 170cc intake runners Airfl ow Results Twisted Wedge 170 Lift Value Intake Flow CFM Exhaust Flow CFM .100" 63 53 .200" 141 107 .300" 205 144 .400" 241 171 .500" 257 187 .600" 257 193 Tests conducted at 28" of water (pressure). Bore size: 4.030" 61cc CNC-profi led combustion chambers; exhaust with 13⁄4" pipe. TFS-51410010-M61 ensure great durability and longevity. Some Twisted Wedge 170 cylinder heads are emissions-legal under CARB E.O. #D-747-1 for 1996 and earlier Ford 289, 302, and 351W engines. Cylinder heads are available fully assembled or as bare castings.
