| I don't claim to know much about the Infiniti J30 other than what Wikipedia can tell me. But in my case, I pulled my lower plenum from a 1993 Infiniti J30 with original engine. The 93 Infiniti J30 had 38P cylinder heads, which is the same as the 1993+ Nissan 300ZX NA. It shares the same injector port shape with the 48P cylinder heads found on 1995+ Nissan 300ZX TT. The Lower plenum that I pulled from the 1993 Infiniti J30 with 38P heads is now in use on a 1995 Nissan 300ZX TT Engine that has 48P heads. Regarding the history of the J30, I don't know if it ever had Pintle injectors and the older style lower plenum found on 30P Cylinder heads in the 300ZX NA. It may be safe to assume that the newer style lower plenum was in use on the Infiniti J30 from 93+. I am not sure what was used in 1992 for its first production year, or if there were any production years mixed between the Newer and Lower style plenums, or if there were any optioned cars that used the older style plenum for a longer period.
Popformance - Automotive Performance Electronics
http://www.popformance.com 1990 Nissan 300ZX
1982 Datsun 200SX
Cardomain website
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