mnkyboy Posted August 16, 2011 Share Posted August 16, 2011 I'm looking at getting everything from a 94XJ to do this swap on a 1990 4.0l I would be using the HO head and manifolds with the Renix electronics I know a few people here have done it and I'm wondering in your opinion was it worth it? Link to comment Share on other sites More sharing options...
ratrapp Posted August 17, 2011 Share Posted August 17, 2011 i actually did this.i took it one step further and used a 99 up intake manifold as well.besides replacing the lifters when the head was off and fixing the oil leaking head gasket it made no difference whatsoever to my truck.i had the head(95 ho head)freshened up at the machine shop so it wasn't like i was using a worn out head.it could be because my renix engine is pretty worn out why i didn't see any improvement as well.you will need to use the ho exhaust manifold and downpipe as well. i used the renix exhaust manifold and in 2 weeks it blew the gasket because of misalignment in the ports.i hope this helps some. Link to comment Share on other sites More sharing options...
mnkyboy Posted August 17, 2011 Author Share Posted August 17, 2011 I wouldn't have expected that,I figured there would be at least some change in performance. Link to comment Share on other sites More sharing options...
ratrapp Posted August 18, 2011 Share Posted August 18, 2011 you may have different results than me.your short block may not be as worn as mine.i even used the ho throttle body with the pricey hesco tps adapter.at first i thought it ran a little better,but that was just hope.after 2 days i realized it really didn't run any better.i did need to pull the head to replace the lifters and and fix the oil leaking headgasket.i'm not trying to discourage you from doing this,you may have better results than i did. Link to comment Share on other sites More sharing options...
jimoshel Posted August 18, 2011 Share Posted August 18, 2011 perhaps there is a change but you just can't sense it. A 5 HP gain on a 116HP engine is less than 5%. Instrumentation will detect it. A human body won't, unless it's really sensitive. Link to comment Share on other sites More sharing options...
ratrapp Posted August 18, 2011 Share Posted August 18, 2011 if all you were going to get was 5-10 extra hp i don't know if it's really worth it.i don't think i got that much if any. Link to comment Share on other sites More sharing options...
Darren Posted August 19, 2011 Share Posted August 19, 2011 I'm looking at getting everything from a super awesome 94XJ from a really handsome guy to do this swap on a 1990 4.0lI would be using the HO head and manifolds with the Renix electronics I know a few people here have done it and I'm wondering in your opinion was it worth it? Fixed. Link to comment Share on other sites More sharing options...
mnkyboy Posted August 19, 2011 Author Share Posted August 19, 2011 I'm looking at getting everything from a super awesome 94XJ from a really handsome guy to do this swap on a 1990 4.0lI would be using the HO head and manifolds with the Renix electronics I know a few people here have done it and I'm wondering in your opinion was it worth it? Fixed. That should be worth a few extra HP Link to comment Share on other sites More sharing options...
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