Quote Originally Posted by hucks 50
look for a block man . that sealer isnot perminent,i have seen them drilled and welded before.
Agree with huck. Back in the day my first 348 would start fine cold, but would not hardly turn over hot even with a new starter and new battery. Not long after I broke some rings under power and the smoke started pouring! The loose engine had severe carbon in the ring lands that expanded when hot in every cylinder, making it almost impossible to turn. Finally busted the oil rings, and that was that.
Sounds like you may have a similar problem, plus a cracked block. Time to look for a block, IMO.