spt Posted July 30, 2007 Share Posted July 30, 2007 I have been doing some searches on this site and other sites on intake manifold gaskets on my 1998 f150. What I am specifically interested in is when Ford switched from the 3mm to the 4mm intake manifold gaskets on the 97 - 98 f150 with the 4.2 liter engine to fix the hydro-lock issue. I have found out the general rule is any 4.2 built after 01/15/98 has the updated (4mm) gaskets but depending on where the motor was built the actually date could be earlier than that. I am curious because my motor had a build date of 01/13/98 and was built at the Essex plant. I do not want to have to tear my motor down and switch gaskets if I do not have to. Does any on this site have any info when the Essex plant started using the 4mm gaskets? Thanks in advance Quote Link to comment Share on other sites More sharing options...
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