I think what WADS56  was trying to say is that if both engines had same compression,heads,intake,cam,induction and exhaust etc. that the 347 would still make more power than the 351. 
Actually, a 347 really has 350 cubic inches of displacement but they didn't want to advertise it as a "350" 
		
	
		
		
		
		
		
		
			
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				'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
			 
		
		
		
		
		
		
	
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