A: It's pretty straightforward. I even have an '88 head (in need of a grind and minor shave) I was going to put on my 4.2L before I decided to go with a stroker. (I had the shop build me a '90 head that was mistakenly thought to be a HO one) From: Todd Tomason <jayscore@xxxxxxxxxxxxx> Subject: 4.0 Head on a 258 To: AMC List <mail@xxxxxxxxxxxx> Message-id: <200505051959.24107.jayscore@xxxxxxxxxxxxx> Anyone have any good information on adapting a 4.0 cylinder head to a 258? I found an article by Tim Weaver on the web. Are there other sites I'm not finding? Thanks, Todd