The easiest way to swap the heads is to drop the engine and cradle. But first the supercha
"I want big power," was the comment from Editor Smitty to Mike Dezotell and myself during a brainstorming meeting last month. The power he was referring to is the little supercharged Two-Valve bullet that resides under the hood of a 2000 Mustang GT at Dez Racing (Seekonk, Massachusetts). It has been the subject of multiple articles over the past few issues, which began with the addition of a pair of newly released Trick Flow Twisted Wedge Street/Strip 4.6L cylinder heads.
Dez and I were left thirsting for more after sampling a healthy gain with the addition of the new heads in stock form. In follow-up stories, we added a larger ProCharger D1SC blower, a Lethal/Fore Precision fuel system with enough fuel pump capacity to support an EFI-Renegade car, Ford Racing 80-lb/hr injectors, F-82 cams from Anderson Ford Motorsport (AFM), and Kooks long-tube headers. The mild 284ci engine spun the dyno to 579 rwhp, but we were way short of the true potential of this combination given its healthy induction and large ProCharger blower. That is when Smitty issued the decree for max power.
This combo served us well by producing 579 rwhp on pump gas (no methanol injection). It co
This month, we pulled out all of the stops and went in search of 600-plus rwhp. We increased the airflow with a set of ported Trick Flow heads and a new intake manifold, which should effectively help the engine rev higher. The Trick Flow 4.6L Street/Strip heads were shipped to Fox Lake Power Products for a workout on its CNC machine. Fox Lake cleaned up the intake and exhaust ports, but left the Trick Flow valves in place (1.84/1.45). As far as we know, this is the first company to offer CNC-ported versions of the Trick Flow 4.6L heads. We ran the heads over to Steve LaPoint Racing Engines to get independent flow-bench numbers. It is the same shop that we used to flow the ported OEM heads and out-of-the-box Trick Flow pieces. The Fox Lake porting added 9 cfm when compared to the out-of-the-box heads-on both the intake and exhaust ports. Now the heads flow 259 cfm on the intake and 189 cfm through the exhaust port, both at 0.500-inch lift. Moving to 0.600-inch lift, the flow numbers increase to 269 and 195 for a gain of 16 and 6 cfm, intake and exhaust respectively.
Getting more rpm from this bullet was a priority and not one that was unrealistic. Better flowing heads would equal more power. The engine consumes more air at higher rpm levels and/or piston speeds. The Trick Flow Twisted Wedge 4.6L Street/Strip heads have higher flow rates through all lift ranges and our heads allow the engine to consume a higher volume of air per cycle.
"The cross-section of the Twisted Wedge port and its velocity was optimized despite the constraints of Ford's layout. We had to deal with the head-bolt boss on one side of the port, the spark plug on the other side, and the spring pocket on the roof. Had we not had those three constraints, we could have made a better port. But given the situation, we made a port that works as designed by giving very good torque and upper rpm power," commented Al Noe of Trick Flow. Fox Lake didn't alter the port design (shape), the CNC process merely trimmed away a little material to help more air pass through the ports.
The short-block is nothing to brag about-it's a stock block bored 0.020-inch (3.572-inch b
Once on the ground, the intake was removed along with the valve covers, front engine cover
The stock Trick Flow exhaust port flows 189 cfm at 0.600-inch lift. Moving to the intake s
The Fox Lake modified exhaust port now flows 195 cfm at 0.600-inch lift.
A set of AFM Hi-Rev valvesprings were installed due to the larger camshafts we employ. The
Fox Lake ran the heads through its CNC machine and the new intake port flows 269 at 0.600-