[GMC70c20]

4.06 bore 3.46 stroke, 2.16 intake / 1.59 exhaust, P/N 809-12598594 head part# there stock L92's, .100 74.9, .200 154.4, .300 225.3, .400 274.6, .500 308.8, .600 328.6, 10.7:1,
stock injection and intake, 1-3/4 to 1-7/8 with a 3.5" collectors about 30" of tube with 3.4" duals, Camshaft duration (@.050 in): 204 degree intake / 211 degree exhaust, Valve Lift (in): .551 intake / .522 exhaust, 114 lobe sep, 110 deg intake centerline, 1.7 ratio stock rockers, 3650 total weight, 60/40 weight bias, 4l60e, with 10" converter, 4.10 gears, 275/60r15 drag radials on back, with a spool.