Hi, I am new and look forward to being in this group. My question is about a head I purchased before I had all the facts I needed. I have an 89' wrangler with a 4.2 engine and I am thinking about doing the 4.0 head conversion. I bought a new 4.0 head with numbers on ot: 0424 between #1 and #2 tappet posts. and another number: 0331 on the manifold side. Also, there are the letters "WJ" near the rear of this head. I would like to know if this is a High Output style head that I can use for this conversion? Thanks in advance for any help or comments. Sam near Detroit, MI
Basically this is not the prefered head. It flows slightly less than the early 90's models, and has in some years a casting problem. However, should be postible to solder or braze up the bad casting area, and the flow will still be way better than the 258 head.
__________________
Wilhelm
I will start using Metric only when the duodecimal system is adopted!!
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Need help identifing 4.0 head 
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