New in the box Dart all aluminum block. This block has the wide pan rails and the raised cam, which will accept strokes up to 4.125 (with minor rod clearance mods)! Blocks come with steel main caps, in 350 or 400 main sizes and in several different deck heights. Not sure which one you need? As always tech support is free! Need the block machined? Additional services are availible to fit your needs! Contact us for pricing of machine work. email@theperformanceconnection.com