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 The MSD is part of the Edelbrock...  The MSD is part of the Edelbrock intake package kit, part number 2839.  The '96 Mustang test mule-with...  The '96 Mustang test mule-with its transplanted '97-vintage mod motor-gets dyno tuned by Aaron Lail at Tru Dyno Sports in Hickory, North Carolina. It is supposedly harder to tune cars with tight LCA cams, but Aaron had no problems tuning our engine with the experimental 111 LCA Lunati cams.  With a box-stock 650 HP Holley...  With a box-stock 650 HP Holley and Edelbrock Victor Jr. intake, the power from 4,500 rpm took off like the engine went into after burner. As good as this looks, there was more to come.  Most off-the-shelf cams are...  Most off-the-shelf cams are ground on a 113 or 114 LCA to avoid piston-to-valve clearance issues. Here are the advantages of going tighter (111): more of everything. A 108 to 109 LCA is about optimum, but piston-to-valve issues prevented testing them.  The large runner volume of...  The large runner volume of the Victor Jr. was unavoidable, given the architecture of the mod motor layout. This diminishes the vacuum signal, which is no problem on a fuel-injected motor. On such a small carbureted motor, however, a low vacuum signal can spell problems that can only be cured by a high-gain, stepped, dog-leg booster like this one.  The blue curves are for the...  The blue curves are for the Holley 650 HP with the stock straight-leg boosters. The red curves are for the high-gain dogleg boosters. Note that the Edelbrock Victor Jr. with the high-gain boosters netted 70 hp more over the PI injection setup. At 6,300 rpm, the carbureted setup was a super impressive 118 hp better. The black curves are for the stock baseline.
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