This is fora427 Gm3955276 Tall Deck Big block.4 bolt main.HI PERF Blockis0.60 bore Now just had cked!has no lipon cylinder,, BBC, ..book says68-84 Heavy dutytruck, Hi Perf,,block looks in good shape no sleeves,striped holes or helicoils.!..These Blocks work Great to install 4.25 or a 4.50 Eagle or ScatCrank in and make stroker 496508,512 BBC or other,Bigger combos alot cheaper than buying a Dart block or Merlin..And there very Strong!! W/thick cylinder walls.And can be bored up to 125 over,,.will list more,,,,also have,another 427 tall deck in store,,0.30,,,,396 Rare heads..thanks for looking. we can do freight quote .com ,,,,Ship is estimate only!!!,,,,,,if u can ship cheaper go for it or pick it up!!!..............i'll palletize free.Please ck out my Store for many more Rare Blocks,Heads, more!!!!........Thanks for Looking!...,,.thanks mike

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