Dyno Results Twisted Wedge 185 Test Engine: 10.35:1 compression 4.6L 2V with Trick Flow Twisted Wedge® 185 cylinder heads (TFS-51910001-M38), Trick Flow Track Max® hydraulic roller camshaft (TFS-51802001), stock intake manifold, followers, and PCM (SCT tuned), Trick Flow TFX™ cold air intake kit (TFS-23066), Trick Flow TFX™ 70mm throttle body (TFS-24070), Trick Flow upper plenum (TFS-51800001), long tube headers with 15⁄8" primaries, 3" dual exhaust with Flowmaster mufflers. Some parts are not legal for sale or use in California or other states with similar laws/regulations—see pg. 2 for details. Specifications Material: A356-T61 aluminum Combustion Chamber Volume: M38: 38cc CNC-profiled M44: 44cc CNC-profiled Intake Port Volume: 185cc Fast As Cast Intake Port Location: Stock Intake Port Dimensions: 1.500" x 1.880" OE Ford PI Intake Gaskets: OE Ford PI Intake Valve Diameter: M38: 1.840" (TFS-51900211) M44: 1.840" (TFS-51900213) Intake Valve Seat: Ductile iron (TFS-51900271) Exhaust Port Volume: 93cc Fast As Cast Exhaust Port Location: Stock Exhaust Port Dimensions: 1.470" x 1.250" D-shape Exhaust Gaskets: OE Ford PI Exhaust Valve Diameter: M38: 1.450" (TFS-51900212) M44: 1.450" (TFS-51900214) Exhaust Valve Seat: Ductile iron (TFS-51900272) Valve Angles: 9° Valve Guide Material: Trick-Alloy powdered metal (intake TFS-51900251, exhaust TFS-51900252) Valve Seals: 01/02/03/04: Viton® fluoroelastomer (TFS-51900454) 05/06: Viton® fluoroelastomer (TFS-52900454) Valve Seat Angles: 45° x multi-angle Valve Spring Pocket Diameter: 1.180" Valve Spring Cups: 05/06: 1.100" (TFS-52900434) Valve Spring Retainers: 01/02/03/04: 7° x .875" o.d. chromoly steel (TFS-51900423) 05/06: 7° x 1.100" o.d. chromoly steel (TFS-52900423) Valve Stem Locks: 7° machined steel (TFS-51900444) Valve Springs: .940"/1.050" o.d. beehive spring (TFS-16519-16) Twisted Wedge 185 90 lbs. @ 1.600" installed height 205 lbs. @ 1.020" open 209 lbs. per inch rate .600" maximum valve lift Valve Springs: 1.000"/1.060" o.d. beehive spring (TFS-16125-16) Twisted Wedge 125 lbs. @ 1.600" installed height Track Heat 185, Standard 275 lbs. @ 1.020" open 275 lbs. per inch rate .580" maximum valve lift Valve Springs: 1.100" dual spring (TFS-16521-16) Twisted Wedge 150 lbs. @ 1.500" installed height Track Heat 185, Optional 290 lbs. @ .900" open 233 lbs. per inch rate .650" maximum valve lift Rocker Arms: TFS-51800510 (OE-style) TFS-52900510 (GT-style) Minimum Bore Diameter: 3.552" Cylinder Head Bolts: TFS-92008 Head Gaskets: TFS-5180901L and TFS-5180901R Spark Plugs: Motorcraft SP432 NOTE: Accepts all Romeo and Windsor valve covers plus most OE Ford front covers with 8mm head bolt holes. Viton® is a registered trademark of DuPont Performance Elastomers. Airflow Results Trick Flow Twisted Wedge and Track Heat 185 series cylinder heads are the best aftermarket heads for modular-powered Fords. The secret? Twisted Wedge combustion chambers and intake valves moved on the opposite side of the cam. The result is dramatic increases in mid-lift airflow, piston-to-valve clearance, and valve-to-bore clearance for using higher lift cams and larger valves without altering bore size or flycutting pistons. Other features include OE PI-style intake inlets, Fast As Cast® runners that deliver near-CNC-ported airflow, CNC-profiled combustion chambers, 3/4" thick decks, patented replaceable cam bearing journals*, and 3/4"-reach spark plugs. The heads fit all 2V Romeo and Windsor engines and accept all OE-style camshafts, followers, lash adjusters, valve covers, and most OE Ford front covers. Twisted Wedge 185 heads are intended for mildly modified engines; Twisted Wedge Track Heat 185 heads are for engines with power adders and/or high RPM applications. Twisted Wedge and Track Heat 185 heads are emissions-legal under CARB E.O. #D-747-3 for 1996–2004 Ford vehicles with 4.6L/5.4L 2V engines. Cylinder heads are available fully assembled or as bare castings. Sold individually. * The replaceable cam bearing journals are protected under U.S. patent number 8,231,278. Twisted Wedge 185 Heads, Fast As Cast Runners, Assembled TFS-51910001-M38 38cc combustion chambers, 90 lb. beehive valve springs, 185cc intake runners TFS-51910002-M44 44cc combustion chambers, 90 lb. beehive valve springs, 185cc intake runners Twisted Wedge Track Heat 185 Heads, Fast As Cast Runners, Assembled TFS-51910003-M38 38cc combustion chambers, 125 lb. beehive valve springs, 185cc intake runners TFS-51910004-M44 44cc combustion chambers, 125 lb. beehive valve springs, 185cc intake runners TFS-51910005-M38 38cc combustion chambers, 150 lb. dual valve springs, 185cc intake runners TFS-51910006-M44 44cc combustion chambers, 150 lb. dual valve springs, 185cc intake runners Twisted Wedge® 185 and Twisted Wedge® Track Heat® 185 Cylinder Heads for Ford 4.6L/5.4L 2V TFS-51910001-M38 See How Trick Flow Twisted Wedge 185 Heads Can Add 100 Dyno-Proven Horsepower to Your Mod Motor Ford! On paper, Ford’s Modular 4.6L 2V engines don’t seem to have much going for them. Don’t believe everything you read. These little SOHC motors may not have shipped from the factory making breakneck power, but the short blocks can handle up to 450 horsepower without mods, no sweat. The key to making more power with a 4.6L 2V is to increase engine breathing—and the best way to do that is with a set of Trick Flow Twisted Wedge 185 cylinder heads. Trick Flow bolted a set of Twisted Wedge 185 heads, Track Max® Stage 1 cams, and a few other bits and pieces to a 50,000-mile 2V engine. That motor spun the dyno to the tune of 408 horsepower. You can learn more about the Twisted Wedge 185 head and the engine build in this article on the OnAllCylinders blog. Don’t say we didn’t warn you! Intake Side Intake Side OEM Ford PI intake port (left) compared with the significantly higher-flowing positive angle Twisted Wedge intake valve arrangement (right).
