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This allow for very low compression, thus low heat.
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Industrial engines had a water port at the end of the head and a 3/4-inch spacer cast into the bottom of the head. The 1958-1962 cylinder heads had a 4-bolt valve cover (even the Max Wedge). MOPAR The Chrysler Big Block began life in 1958 and lived until 1978. Raised and greatly enlarged Intake and exhaust ports Or by using a boost referenced mechanical fuel pump only (up to 500 hp) or a boost referenced mechanical fuel pump in conjunction with a low pressure electric pump (i.e. 400, Magna-Flow 250 or similar type fuel pump) and a return style, boost sensitive fuel pressure regulator (Mallory #4309 or similar). This can be accomplished by an all electric high pressure-high flow fuel pump (i.e. Therefore, a fuel pump capable of providing a minimum fuel flow of 55.4 gals/hr at a pressure of 21.6 psi is required. (500 boosted hp) x (.65 lbs/hr/hp bsfc) = 325 lbs/hr fuel flowģ25 lbs/hr / 5.87 lbs/gal = 55.4 gals/hr fuel flow To convert to gallons per hour, divide this figure by 5.87. This will give your fuel flow requirement in 1bs/hr. To determine required fuel flow, multiply your total expected horsepower by a bsfc (brake specific fuel consumption) of. Multiplying this figure by 1.2 (20% safety factor) gives us 21.6 psi (8 psi idle fuel pressure) + (10 psi boost pressure) = 18 psi max fuel pressure To determine maximum operating fuel pressure requirement, add your maximum boost pressure to your initial idle fuel pressure. Your fuel pump must be capable of supplying the proper amount of fuel flow at the maximum operating pressure. 600 cfm (#4776) for up to 500 hp 650 cfm (#4777) for up to 650 hp 700 cfm (#4778) for up to 750 hp 750 cfm (#4779) for up to 900 hp All carburetor’s will require removal of the choke assembly and choke horn, replacement of the floats with the solid nitrophyl floats and jetted to suit your motor. Holley double pumper w/ mechanical secondaries. Intake manifoldĭual planes are recommended to improve low end torque, however may require staggered jetting for good fuel distribution with carbureted applications. The size of headers are dependent on whether you are wanting to create more low end torque or high rpm horsepower. Crankshaft and rodsĬast up to 450 horsepower, forged for higher horsepower or for rpm levels above 6,000 rpm. Contact a cam manufacturer for lifts and durations that best suit your application. Lobe separation: 112 to 116 degrees Split pattern: Exhaust duration and lift approximately 10 degrees and. Aluminum heads will allow you to run approximately 1 psi more boost than cast iron heads due to their ability to dissipate heat. Porting, especially on the exhaust side is recommended. Supercharging produces a percentage gain in horsepower by starting with more base horsepower a modified motor will receive a larger total hp gain (from the same percentage gain). Higher flowing heads will help generate more horsepower than stock heads. The same rules for normally aspirated engines apply to supercharged motors. To determine the maximum boost level for your compression ratio (using pump gas), refer to the enclosed compression ratio chart. Higher octane fuel will allow you to run higher boost levels, approximately 1 psi for every 2 points of octane. Compression ratioįor pump gas (91-93 octane) applications, a compression ratio of 8.5:1 to 9:1 is recommended for boost levels of 8-10 psi. Cast and hypereutectic pistons can be used but should be limited to lower horsepower (approx 450-500 hp) applications.
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Pistonsįorged pistons recommended for all applications.
INDY 440 1 HEADS PROFESSIONAL
For more detailed specifications regarding your specific application or for "strip only" use, please consult a professional engine builder. The following specifications are general guidelines offered to aide in building an engine for street use.