High strength aluminum block, 356-T6 grade aluminum Splayed 4-bolt, steel billet main caps on 2,3 and 4 2-bolt main caps on 1 and 5 4.110"-4.115" bore as delivered, cast iron sleeves 4.125" 9.5-inch; deck height, accepts small block timing chain, timing chain cover and oil pump 2.75-inch crankshaft (351C) main journal diameter. 2.9415-2.9425" diameter finished main bearing bore Lifter bores finished .8753"-.8768" 2.2032-inch - 2.2052-inch diameter cam bearing bores. Uses cam bearings, part number M-6261-J351 or M-6261-R351 Maximum stroke 4.250-inch Wet Sump Oiling System Weight 118 lbs.