Oil Cooler; High Horsepower Transmissions; Steering Rack; High Performance Manual Braking Systems - Factory Five Racing MK4 ROADSTER Assembly Manual

We've found that the Mustang factory headers work well for the stock engine. If you want to go to an
aftermarket set, the 1⅝" MAC shorty unequal length headers or Ford Racing 1⅝" unequal length headers fit as
bolt on parts. They will reward you with an approximate 5-10 hp bump in the top end. All aftermarket headers
use mandrel (smooth consistent bends) bent tubing. The stock ones are not and are restrictive on non-stock
engines.
If using a 351W engine there are two options, use 351W engine swap headers from Ford Racing (M-9430-A58)
or MAC (E358692) or if smog/catalytic converters are not necessary, use our full length 4 into 4 headers.
Timing
Most computer chips simply change the timing of the engine and slightly enrich the mixture. Using a timing
light, advancing the base timing to 14 will do the same. Higher octane fuel will be needed.
Under-drive Pulleys
Yes. They work well on all cars.

Oil Cooler

Not really necessary on small blocks or cars that aren't raced heavily. They look nice when installed in the
smaller opening below the radiator. For supercharged/turbocharged or big block track cars an oil cooler will
help.
Factory Five offers an oil cooler with #10 Stainless Steel braided lines and mounting bracket.

High Horsepower Transmissions

The stock T-5 is good for the stock 302 engine. If the engine is going to have some work done to it then an
upgrade to a heavy duty, Ford Racing "Z" T-5 is all that is needed. An additional change to a Tremec TKO 500
or 600 is needed if the engine that will be used has 300lbft of torque or more. One unique feature of the Tremec
TKO is it allows the shifter to be relocated 8" forward of the normal shifter location if a vertical shifter is
desired verses a forward angled shifter.

Steering Rack

The complete kit comes with an 18:1 manual steering rack. This is good for most driving situations. We have
found that many of the Challenge Car racers prefer to use power steering. This can be done by using the stock
1987-1993 15:1 Mustang power rack and power steering pump. If changing to a power 15:1 rack, a universal
joint with a different number of splines will be necessary in order to connect the steering shaft to the steering
rack.

High Performance Manual Braking Systems

Factory Five offers some great Wilwood Brake packages that are designed to fit inside the Factory Five wheels.
See www.factoryfiveparts.com
The braking systems recommended below are designed for those searching for higher performance braking
capabilities. These are systems that have been used successfully by our customers and us. Each component
for more information.
www.factoryfive.com
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508-291-3443