Fox Lake's CNC-Ported Cylinder Heads - Fox Trot

"What sets us apart from everyone else in the market is that we change the shape of the port," Robart says. The different shape helps the air and fuel mixture flow to the valve easier.

Exhaust flow is excellent on these heads, with 190 cfm at 0.550 inch lift.

AFM F-42 camshafts were bolted down, and the cam cap bolts are tightened to 99 in/lb.

The head bolts were placed in the bolt holes and held in place with zip ties. This makes it easier to drop the bolts into place when the head is on the block.

Once the cams were swapped, we bolted on the FRPP shorty headers.

New Ford head gaskets are used, and surprisingly they work exceptionally well. The guys at the shop all commented that they work great on '03-'04 Cobras and so many other blower combos they've built. They posed the question, "Why change?"

Two people were needed to get the heads onto the block: one to hold the heads, and one to keep the wiring and everything else cleared away from the deck.

A new set of Ford head bolts was used. They are torque-to-yield style and must be thrown away after one use. There's a six-point torque sequence. Working from the middle out, torque all bolts to 30 ft-lbs. Using the same pattern, turn each bolt 90 degrees. Next, back off each bolt. Retorque everything again to 30 ft-lbs, turn 90 degrees in the same pattern, and finally repeat the process of tightening the bolts another 90 degrees. The idea is to get the head even on the block, back off, and then do the final torque sequence. If you use ARP bolts, the torque sequence is 30 ft-lbs, 50 ft-lbs, and finally 75 ft-lbs--far easier than the stock bolts.

The cam sprockets, crank sprockets, and chains were reinstalled. We marked the components, so everything went back on correctly. The cam sprocket was tightened to 100 ft-lb.

A custom tool was made to install the front seal on the front cover.

A Ford OEM gasket was pressed into place on the front cover.

The rest of the parts went back on easily. Since we used Romeo heads instead of the original Windsors, a new set of valve covers and front bolts (10 mm vs. 8 mm) were needed. Machie checked to make sure everything was hooked up properly.