4 bolt main ,steel crank,4 stage dry sump,crower rods,ross pistons 13/1,pro comp heads -2.100 int. 1.65 ext. ported 1.46 springs,crower roller rockers,2 1/2 hilborn injection /with usac legal restrictors..vertex external coil mag...hilborn 'o' pump included $5500 cash text 217 413 6939 for pictures...freshend last fall ..ran 5 races on 1/4 mile track ...I'm in Ca.