Forbidden

Is there any difference between the JDM and the USDM heads? I think I've seen someone mentionning that the JDM Type S had a different valve angle or something I'm don't remember well... Are the JDM Type S and JDM non Type S head the same or are they different other than for the cams? Also Is the JDM head better than USDM?

I was also wondering if the JDM H22 blocks were open deck or closed deck

Thanks in advance!

Forbidden

Nobody can answer this? I've made a search on this site and somebody mention the valve seat angle was 60 degree on the JDM head vs 45 on the USDM. Is there any advantage on one over the other? I know that usually JDM is better but I'd like some opinion/fact/anything somebody can tell me.

TimeRacer

The valve angles are different, but other than that it's anyone's guess. No one has had the time to import a JDM H22A4 head and open it up and check out everything. Go one way or another, if you get the JDM H22A4 head, finish it and get the longblock.

~Doug