454 LS-7 XCH

Mid 70s 454 LS-7 bought in the original crate a few years back. There are very few videos or information regarding these 50 year old engines. Those that have them, traditionally seem to add roller cams, aluminum after market heads and other internal speed parts. This engine was the successor to the LS-6 found in Chevelle's and Corvettes, and was slated to go into the Corvette. GM killed it due to emissions regulations. Subsequently, these were sold over the parts counter as a Off highway use only engine. GM rated the LS-6 at 450 HP, and the LS-7 at 465. The engine was only offered as a long block, no manifolds, carbs, distributor. This particular engine was located in 2020 still in the factory crate. It was purchased and shipped directly to my engine builder in las Vegas where it was disassembled, cleaned, and checked. We only replaced the following parts as a precaution, and maintained stock level parts for a true representation. Gaskets, rod and main bearings, Valve springs and seals, and rings. The engine received a light hone, but maintains its standard bore, and a light valve job as the valves were exposed for 50 plus years. This engine uses the same solid flat tappet cam as the 427 ZL-1, and was a step above what the 427 L88 had in terms of lift and duration. Parts added to this specific build to complete it were twin Holley 660 center squinters, Offenhauser tunnel ram, MSD E curve distributor, poly locks for the stock rocker arms, and the Edelbrock valve covers. Rated at 465 HP, this engine made 582 hp at 6000 rpm with no air cleaners, and 2 1/4" dyno headers. Installing my 1 7/8 American racing chassis headers (1970 Monte Carlo), and twin velocity stack air cleaners brought the power down to 570 at 6000 rpm.