well that stink's supra froums  has no search again 
it was good read a bunch of smart facts in it 
stateing the diffs between the 2 heads and porting facts ect 
the 1j head just did not beat it in any way even wiht it's supposed bad casting 
cause if it was bad head  then every drag supra out there  whould run a 1j head but they don't 
wink pidea is not all way right 
	
		
			
				charlesshen;1124392 said:
			
		
	
	
		
		
			not all information on the forums are correct i trust in facts from the encyclopedia/ wikipedia and the yes the 2j has a great head but it does have casting flaws in cyl 5 & 6 and also has smaller exhaust port but then again it does have longer valve duration and clearance on the intake side you know you win some you lose some just cant ever get it all