By spreading the cylinder bore centerlines from the standard 4.400” to 4.500”, large bore sizes can be achieved with adequate head gasket sealing space between the cylinders.Bosses are added at the ends of the decks to accommodate two extra head studs, increasing clamping loads and improving gasket sealing. (The extra studs are also provided for in Dart’s new 4.500” bore space cylinder heads). These new blocks are ideal for big inch competition engines. The cam location is raised .391” and oil pan rails are spread .400” per side on both the iron and aluminum blocks, providing lots of room for stroker crankshafts while eliminating the need for fragile small base circle camshafts. Big block cam bearing journals are standard, and 350 or 400 main bearings are available.It is recommended that you contact a Dart technical representative before placing an order for this item. Detailed information about your planned engine build will help to ensure that you choose the right configuration for your motor and that any special parts and considerations are taken into account.Features:
Block Prep Service:Cobra Power is a state of the art machine shop. For an additional $430 we will fully prep your block the right way. This will include:
Freight:We ship all of our engine blocks through Unishippers, We will only ship to commercial locations with loading docks and or forklift trucks. If this is not an option we can also set the freight for customer pick up at the shippers terminal. Call 305-893-5018 for an accurate shipping price.