Quote:

New from the shop 410 SB stroker has a strange thumping or popping sounds . . . Don



I would have not hesitate to get the "shop" involved immediately. The more time you play with it the less likely they'll stand by it.
A friend of mine once paid for HP motor rebuild on his Mustang. Shop even installed it for him and called him to come and get it. He drove about a block and half and saw there was no oil pressure. Stopped, pulled the stick and you guessed it - empty. Turned around and drove back to the shop and they had the gall to say it was full when it left here.
Get your mechanic on this ASAP.