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		 All B's are dohc... 
 
almost all D's are single (except rare jdm "zc" engine... however not all "zc" engines are dohc). 
 
H's are dual 
 
F's are single... 
 
they're basically just designation letters... the first letter 
B18c1 
D16z6 
H22a1 
 
shows the engine block code... So parts between all "d" series engines are interchangable (sometimes with work). 
 
It basically means that all engines stamped "b" will accept a head or tranny from another "b" series engine. and probobly a lot more parts too... 
 
the numbers as mentioned denote displacement. 
D16y8    1.6 liters 
B16a3    1.6 liters 
H22a      2.2 liters 
 
the last part is the head/gen code... 
 
D16y8    96+ civic ex motor (sohc w/vtec)  
D16z6    92-95 civic ex/si motor (sohc w/vtec) Same block but different heads... 
B18c1    94+ integra gsr motor (dohc w/vtec and dual stage intake runners) 
B18c5 94+ integra type R motor (dohc w/vtec) 
 
 
 
 
Oh and sorry for the OT... but  
 
"girlsolracer" 
 
Why in gods name would you "swap" basically an identical engine with some factory tuning? that doesn't seem like a very cost effective 10 hp. 
		
	
		
		
		
		
			
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