i just recently rebuilt my 1965 289. bone stock 289. i was going to started for the first time today. i crank it it a few times , it sounded weird when it was cranking not normal at all. i checked compression cylinders #1-4,5, and 8 had 0psi. performed cylinder leak down test, all 6 cylinders 90% leaking.
cylinder 6 and 7 150psi. block was rebored from std. 030. new piston, rings, cam lifters,cam, int. and ex. valves, installed, machine shop recondition rods, crank was cut to .010, internal balance, heads rebuild with new valves and seats. A LOT OF MONEY invested, any ideas what's wrong with it. i would hate to remove th engine. i added a few drops of oil in the bad cylinders to see if the pistons ring were bad compression did not raise.