Hi All! May i know if a STOCK 1972-73 U.S. version 240Z have the SAME Cylinder head specs(CAM profile, Intake and Exhaust Valve size) as the JAPANESE version? How about from other countries? THANKS A LOT!

Patrick

Patz,

The US version S30 / 240Z came with a 2.4 liter L24 engine. Head and valve specs varied between 1970 and 1973 as you may know. The Japanese S30 came with L20 engines until the introduction of the HS30 and HS30S in October 1971 which came with the L24 engine. Known as the Fairlady 240Z and 240Z-L, the cars were very similar and I suspect the specs for valve and cam were the same as the HLS30 in the U.S. There are casting identification numbers on the heads just above cylinder #1 which should identify and confirm compatability. For instance, my 1969 produced cars came with the E-31 head. Depending on which head you have, I would imagine the cam and valve specs to be the same.

I'm guessing that the '72-73 US spec head was not the same as the rest of the world. The E88 heads as used in those years had combustion chambers that were "optimized" for emissions. I suspect that the valve specs and probably the cam were the same.

The head casting number may not tell the entire story. There were (IIRC) at least four different major variations of the E88 head as used on US cars from mid-'71 through the '74 260Z.

Okay, thanks very much for the info 26th-Z and Arne! I`ll check the I.D. number first and then go from there. patrick