Chevy Big Block Casting number help.
Hey guys, i have a block here casting numbers on the back of the block...RR is k21 73
LR is 3999289. The deck numbers are gone. My chevy parts interchange manual says its a 454 from 70-79, and by the K21 73, im guessing it was made in 73. It is a four bolt, and it has the big pipe plugs on the filter housing. How can i tell more about this block. Is it a replacement block from GM? did they make a production 4 bolt in 73? thanks in advance.
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So when the 455 came out with the MarkIV Ram Air, A beefed lower end, And a carter high riser set up, I was online! 390 HP. 500! Foot lbs of torque. Whatever that is.
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