1970 #15's [87CC] are a great 455 head,give about 10:1.I have a set on a 400 i just did a stock rebuild on,haven't run it yet.The other set i'm porting and having big valves and screw in studs done to them.
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1977 Trans Am,400 4 speed,numbers matching car 
1979 Bonneville ,1 owner car... 
1997 Trans Am convertible,LT1/auto.
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