Quick inspection '69 Chevy Yenko Camaro Pro Touring Owner: Darryl Nance Engine & Drivetrain Darryl streamlined the exhaust flow with Lemons 2-inch primary pipe headers and 3.5-inch collectors that neck down to a 3-inch stainless exhaust tubing interrupted by Flowmaster Super 44 muffs. Otherwise, the engine is untouched. He included a GMPP accessory drive system, computer harness, et al that depends wholly on a Kinetik high-performance battery. Would Yenko have included the dry sump oiling system? You bet, red rider. Darryl made it all work with Peterson Fluid Systems equipment and the LS7 oil tank and ancillaries. Engine coolant is cycled and managed by a Be Cool radiator and twin push fans. Though the 427 is factory rated at 505 hp at 6300 rpm and 470 lb-ft of torque at 4800 rpm, Darryl figures the underrated engine makes more like 540 hp in a 3300-pound envelope. However, for the roll-out, the engine was saddled with less-than-optimal LS3 exhaust manifolds with pre-cats and cats and four oxygen sensors. The immediate future will include slicker LS7 manifolds for the full-on green conversion and Darryl is working on that with GMPP right now. Despite serious wheelspin, drag testing revealed 12.50-second elapsed times at 118 mph, more or less confirming his power guesstimate. A sticky tire would shove this job straight into the mid 11s with nary a drop of sweat or blood. Lucky guy got the first Tremec T56 Magnum transmission ever built, worthy of at least 700 lb-ft. He put ...
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