M-6007-Z427AFT/ART
Crate Engine
INSTALLATION INSTRUCTIONS
NO PART OF THIS DOCUMENT MAY BE REPRODUCED WITHOUT PRIOR AGREEMENT AND WRITTEN PERMISSION OF
FORD RACING PERFORMANCE PARTS.
Techline 1-800-367-3788
Page 2 of 19
IS-1850-0387
Factory Ford shop manuals are available from Helm Publications, 1-800-782-4356
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Many oil systems only flow one way. Connecting the remote oil filter or oil cooler lines backwards can cause
engine damage/failure.
IGNITION SYSTEM CONSIDERATIONS/COMMON PROBLEMS
The ignition system must deliver a properly timed spark. There are a lot of factors that determine when the spark
should be delivered. The most common factors include: compression ratio, fuel quality, fuel octane rating,
combustion chamber design, engine operating temperature, power adders such as NOS or supercharger, inlet air
temp, altitude, and load.
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Avoid too much or too little timing for your engine combination.
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Avoid hooking up the vacuum advance to intake manifold vacuum instead of ported vacuum.
•
Avoid inductive crossfire created by improper plug wire routing. Separate plug wires on cylinders that fire
in sequence.
•
Improper timing can damage pistons, rod bearings, head gaskets, and many other engine parts.
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Typical total mechanical advance timing at 4000 rpm for Ford Racing Performance Parts crate engines:
427 - 32 to 34 degrees total. (premium fuel only)
FUEL DELIVERY CONSIDERATIONS
Size of fuel pump, size of fuel line, fuel pump placement, fuel filter placement, fuel filter size, injector size, fuel rail size,
fuel pressure, jet size, and baffling in the fuel tank.
Does the fuel system maintain full pressure at peak engine horsepower in high gear? Altitude, air temperature, and
fuel characteristics including quality, specific gravity, and octane rating, will affect your jetting requirements. Engine
efficiency and Brake Specific Fuel Consumption (BSFC) also have an effect. Here are some examples of a Holley
750 CFM 4V.
Jetting
Jetting
Octane
Temp.
Elevation
Front
Rear
94
80 F
Sea level
81
86
Aviation 100LL
80 F
Sea level
81
84
110 Race
80 F
Sea level
78
83
94
80 F
3000 ft.
76
81
94
80 F
6000 ft.
73
77
94
40 F
Sea level
84
89
94
120 F
Sea level
78
83
As you can see by these examples, jet requirements can vary a lot depending on fuel, altitude, and temperature.
Oxygenated fuels are available in some states and can dramatically affect your jetting requirements. Make sure you
get your jetting correct.
