Yes.. All the same heads ... just the chassis and options, etc.... for the difference.
Firebird 400's (330-335hp)had the restricted carburetor linkage to cheat a lower advertised HP
GTO 400's (350-360hp) were the same as the Firebird exept the four barrels opened fully..
FullSize models 390 HP 428 HO had the better exhaust manifolds than the GTO HO 400 and yielded the highest HP rating with the bigger engine , fully open carb and the great exhaust...
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