they are very reliable. i have 191,050 miles and i've only replaced the starter, but what starter doesn't go out <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/biggrin.gif" border="0" valign="absmiddle" alt='
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the Hicas equipped 240SX will have a DOHC because they didn't have hicas on the 89-90 i don't think.