Difference between 1990 240sx cylinder head and 1993 frontier cylinder head - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

deviousKA · 08-11-2003, 09:28 PM

if your sure it came off of a 1993 ka24e, its not a frontier head its D21 Harbody. if you dont plan on completely disassembling the head and cleaning, you may do more harm than good. if its relatively clean (no chunks of oil buildup etc...) just take the rocker assembly off and make sure the oil passage to the lifters is clean and free of debris, the passage goes all the way from the cam towers to the bottom of head. make sure all the lifters feel "springy" (there are no springs inside fyi). the cam profiles are different on d21 ka24e so im pretty sure the redline is dropped down 500 rpm (not totally sure but i know its a different cam profile). other than that and the fact that the head was cast in mexico they are identical

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08-11-2003, 09:28 PM	#2
deviousKA Zilvia Junkie Join Date: Jan 2003 Location: Idaho Posts: 437 Trader Rating: (0) Feedback Score: 0 reviews	if your sure it came off of a 1993 ka24e, its not a frontier head its D21 Harbody. if you dont plan on completely disassembling the head and cleaning, you may do more harm than good. if its relatively clean (no chunks of oil buildup etc...) just take the rocker assembly off and make sure the oil passage to the lifters is clean and free of debris, the passage goes all the way from the cam towers to the bottom of head. make sure all the lifters feel "springy" (there are no springs inside fyi). the cam profiles are different on d21 ka24e so im pretty sure the redline is dropped down 500 rpm (not totally sure but i know its a different cam profile). other than that and the fact that the head was cast in mexico they are identical