Where’d That Power Come From? Stock versus Trick Flow Heads Stock NPI (92-99) Heads Stock PI (99-Present)Heads TFS Twisted Wedge Intake Runner 146 cc 159 cc 185 cc Intake Valve Diameter 1.752 inches 1.752 inches 1.840 inches Exhaust Runner 93 cc Exhaust Valve Diameter 1.339 inches 1.417 inches 1.450 inches Combustion Chamber 52 cc 44 cc 38 cc Compression ratio (stock pistons, rods cylinder bore, and deck height) 9.3:1(with 10.5cc piston dish) 9.4:1(with 15.8cc piston dish) 10.1:1(with 15.8cc piston dish) Cam Specs 204/208 duration at 0.050 lift/0.480 valve lift 200/208 duration, 0.505/0.531 valve lift, 115 LSA 228/230 duration, 0.550 valve lift, 112 LSA The secret to our 4.6’s newly found power is a collaboration of a better combustion chamber design, bigger ports, slightly larger valves, and Trick Flow’s canted valve arrangement. Changing the angle of the intake valve provides a better path into the cylinders. It also eliminates piston-to-valve clearance problems very common to SOHC 4.6 engines—you can’t advance the cam too far or run intake lift numbers more than about 0.525 inch without notching the pistons. With its valve arrangement, Trick Flow says lift of up to 0.600 inch is safe. Every engine builder we’ve checked with says Trick Flow’s heads—with CNC-shaped chambers and as-cast intake and exhaust runners—will outflow any ported factory cylinder head, and our gains of 70 hp to the rear wheels is right inline with what other Trick Flow customers are seeing. While we’re still breathing through the car’s stock intake and tailpipes, we know there is more potential in these heads, especially at higher engine speeds. We’re looking at intake combinations and possibly a power-adder to see how much more we can wring out of these things. Note in the chart above that the best naturally aspirated combination may be an early non-power- improved block and Trick Flow’s 38cc chamber heads. If you want more compression, bolt these heads on a four-valve block, which comes with flat-top pistons and will net a compression ratio of nearly 12:1. For guys who love boost, Trick Flow also sells a version of these cylinder heads with 44cc combustion chambers. END Parts List Description PN Source Price Clean block and install freeze plugs N/A Hi-Tek $50.00 Trick Flow 2V Modular Top End Kit TFS-K519-390-375 Summit Racing 2,899.95 ARP main bearing cam studs 156-5401 ARP 106.95 King main bearings KGB-MB5353SI Summit Racing 50.95 King connecting rod bearings KGB-CR868SI Summit Racing 39.95 Cloyes timing chain tensioner, right 9-5433 Rock Auto 33.79 Cloyes timing chain tensioner, left 9-5432 Rock Auto 32.79 Fel-Pro timing cover gasket set TCS45869-1 Rock Auto 16.64 Fel-Pro oil filter adapter gasket 230 70801 Rock Auto 7.59 Fel-Pro front crank seal 230 TCS46114 Rock Auto 9.31 Cloyes tensioner arm, right 95340 Rock Auto 17.51 Cloyes tensioner arm, left 95341 Rock Auto 18.81 Cloyes timing chain guide, right 95428 Rock Auto 18.81 Cloyes timing chain guide, left 95429 Rock Auto 19.17 Fel-Pro Oil pan gasket OS30725R Rock Auto 22.79 Fel-Pro valve cover gaskets VS50564R Rock Auto 29.79 Comp adjustable cam gear set 10246SET Comp 248.95 Connecting rod bolts (4.95 each) F3LY-6214-A South Bay Ford 79.20 Rear main seal F4AZ-6701-A South Bay Ford 25.57 Piston pin retainers(sold in sets of 4) F6AZ-6140-AA South Bay Ford 37.84 Stainless Works headers and catalytic converters CRVIC03HDRCAT Stainless Works 1,590.00 Spark plugs NGK3403 B&C Auto Parts 27.60 TOTAL $5,383.96 Tool List Description PN Source Price Ford V8 cam holding tool OTC-6498 Summit Racing $119.95 Cam degree supplement kit TFS-90100 Summit Racing 39.95 Ford rear crank seal installer tool OTC-7786 Summit Racing 109.95 Harmonic balancer installer OTC-6505 Summit Racing 119.95 Cylinder leakdown tester OTC-5609 Summit Racing 99.95 Piston ring installer and compressor tool CMB-17-0000 Summit Racing 34.85 Proform Parts universal degree wheel kit PRO-66787 Summit Racing 89.95 TOTAL $614.55 SOURCES Westech Performance Group Mira Loma CA 951-685-4767 http://www.westechperformance.com South Bay Ford Hawthorne CA 888-358-9380 www.southbayford.com Comp Cams 3406 Democrat Road Memphis TN 38118 800-999-0853 www.compcams.com/ B&C Auto Parts Gardena CA 310-380-7474 Cloyes Gear And Products Inc. Ft. Smith AR 479-645-1662 www.cloyes.com Hi-Tek Engine Rebuilding Gardena CA 310-327-2411 Rock Auto 6680 Odana Road Madison WI 53719 866-762-5288 www.rockauto.com King Engine Bearings 327 Little Falls road, Suite 5 Cedar Grove NJ 07009 800-772-3670 www.kingbearings.com Stainless Works 9899 E. Washington St. Chargrin Falls OH 44023 800-878-6935 www.stainlessworks.net Racers' Edge Tuning 8107 Phlox Street Downey CA 90241 562-622-2508 www.racersedgetuning.net Blue Oval Chips Danville IN 317-718-7231 www.blueovalchips.com SPX Service Solutions Romeoville IL www.servicesolutions.spx.com « | 1 | 2 | 3 | View Full Article Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!