With displacements up to 455 cubic inches, the Race Series small block Chevy aluminum bare blocks are an ideal starting point for any project that involves sprint cars, modifieds, late model stock, dragsters and unlimited competition classes. Incorporated features include: * Standard 9.025 , tall deck 9.325 and 9.500 versions allow for greater versatility. * Raised camshaft .391 (4.912 camshaft to crankshaft centerlines) provides more clearance for stroker cranks and eliminates need for fragile small base circle cams. Option for .434 raised cam also available * Relocated oil pan rails are spread .400 per side (.800 wider than stock) to increase crank/rod clearance and reduce windage losses * Siamesed cylinders: Standard 4.000 or 4.125 cylinder can be safely bored to 4.185 (ductile iron sleeves and extr-thick walls prevent cracking and produce excellent ring seal * Oil pan bolt holes are relocated in line with main caps to eliminate interference with rotating assembly * Main bearing bores are available for 350 (2.45 ) and 400 (2.65 ) bearings allow engine builders to maximize crankshaft strength and minimize friction * 4 bolt billet steel main caps have splayed outer bolts minimize bearing bore distortion * Big block camshaft bearings allow use of cams with larger base circle diameter to improve strength and resist twisting with cam driven pumps * Dual starter mounts allow starter to be mounted on either side of block for chassis and oil pan clearance * Front and rear external oil inlets, crossover and restrictor provisions to simplify plumbing with external pump * Scalloped outer water jacket walls improve coolant flow around the cylinder barrels to equalize temperatures * Coated cam bearings, freeze plugs and dowels are included