zerocool1014a said:
check the cat on it.. if it is choked up into the exhaust manafold its somewhat likely its the hf engine.. also check your gas mileage there is quite a difference between the hf and the dx
none of them options would be really that a valid way to check the engine.. .
the gas milage of a poorly running hf could be almost nothing.. . .and with my b18 i get great milage. . . possible better than before.. ..
the cat although it is specific to the hf model is part of the exhaust and not the engine and although it would be dumb to do an engine swap and use the hf's crappy manifold... it certianly would be possible and easy since it is already bolted up. . .
like was mentioned above. . . check the code on the block... . d15b2 d16a6 etc. . . . .let us know what the code is.. . . . that is the best way...
that will at least tell you what the bottom end is. . . . the head could have been swapped. . .but there is much gossip of weather the hf pistons have the other 8 valve reliefs to accomidate a dx or si head...
also i hve noticed and i havent been around hondas in a while to check this and know which is which but the plug locations differ in the different d series engines. . .
one has them at the front of the valve cover one at the rear. . . there fore.. . . the covers would no be interchangable. . . with out moving the head over along with it. . .
give us the code. .. . and well let you know. . .
m firends civic hatch had an si engine in it but still had the HF style stock exh manifold on it. . . . . i know that because i put it in there. . . .
Chris
b 
