probably a head gasket. or....cracked head...one way to check is with a cue tip. let the car sit, crank it over with the fuel line plugged(no gas) do this for a minute. pull your plugs one at a time. put the cue tip in the hole.... then pull it out and see if it smells like antifreeze. weird method but it works..
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1970 firebird, 468, e heads,
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