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71 455 is the ONLY HO very rare and worth hunting for BUT very pricie
that was a one year only firebird only motor the only hi comp 455 with round ports
I found a ho455 4 BOLT MAINS SHORT-block but never could find the rare heads for my GTO
STOCK THE GTO ONLY CAME WITH ''D'' PORTS IN A 455
later 74-75 SD 455 has round ports but A low comp smog motor
with forged rods that EVERYBODY USES IN BUILT 455'S
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