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SignUp Now!The heads have LS valves but it is a modified Nailhead Buick engine. From the link I posted above:The '56 actually had an LS motor in it that had been machined for the nailheads to fit.
Every engine that goes into a Rad Rides car is absolutely critical to the build. For the '56 Nailed, the engine took on an especially huge part of what the car would become. Final displacement of the 401 turned out to be 413 cubic inches. Heavy duty race part selection for these old Buick motors is somewhat limited. In order to make the 413 Nailhead live with our Rad RidesDigital Injection Twin Turbo induction, we built a number of stronger engine parts here at our shop. For example, the main caps and the pan girdle were custom made by our own CNC guy, Lawrence Laughlin. The added bottom end strength we created was then enhanced by Carillo "I Beam" connecting rods. For improvement in crankshaft reliability, the Nailhead 12784563 firing order was changed to a better, but unconventional 15634278 firing order with the #1 cylinder on the passenger side bank. A six stage dry sump oiling system is installed to insure adequate lubrication. The oil pan was fabricated here at Rad Rides. Special one-off pistons and a custom ground billet steel camshaft were designed to work in concert with the twin turbos. The heads have been modified and fitted with modified LS valves and Beehive valve springs. Bob Sweeney and Ken Cryan of FX Engines in Mokena, Illinois, did their typically outstanding job of assembling the engine.
Ok I missed the link to that information. I was talking to an older gentleman out in the car show area that seemed to know a lot about the car but not sure how or if he was associated to the owner, anyway he had told me and my buddy it was an LS retrofitted with railheads. Thanks for the clarification and posting the details, really even more impressive knowing that it is an actual nailhead motor now!The heads have LS valves but it is a modified Nailhead Buick engine. From the link I posted above: