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  #1  
Old May 4th, 2009, 04:34 PM
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Phillip
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headwork

What have you guys have done to get a little more out of the heads? It seems we are really limited by the fuel injection system. I am planning on keep stock everything less the cam, Crower 240 seems to be the consensus. Are the stock valve springs and manifolds/intake up to the job? Hoping to polish the turd a little.

It would be so nice to order something turnkey from RPi, thats way to easy.
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  #2  
Old May 5th, 2009, 12:56 AM
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Robert Dassler
1994 D90
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I've had some work done to some Rover heads. My Disco is running ported heads with 4mm larger intakes and 2mm larger exhaust valves. I'm running a pretty big cam with stock 4.0L bottom end and stock exhaust manifolds. The exhaust is 3" after the cats. It'll get right after it and is fully capable of 3 digit speeds....even at altitude. There is a lot to be gained from headwork in these engines. Unfortunately, the guy I had developing the heads has quit. I intended to offer them for sale on an exchange basis at one point. We averaged about 20 hours of hand port work per head plus the machine work and all new valves, springs, retainers, keepers, etc. It's not easy or cheap, but the results are good.
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  #3  
Old May 5th, 2009, 06:19 AM
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brian bertolini
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Hi, I might be parting with a set of 4.6 heads that I mated to a 4.0 no problems. They have the smaller combustion chambers for higher compression, as well as having oversized valves, heavy springs yada yada. Cost about 2 grand- for the machine work and heads. Done by the wedge shop in Mass.
Brian Bertolini
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  #4  
Old May 5th, 2009, 07:41 AM
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Skys the limit. I am going to try and get the heads ported valves done and find some springs etc to match the cam. I am leary to do to much with the fuel injection.
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  #5  
Old May 5th, 2009, 08:57 AM
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Michael Bruzga
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Have you done a cost estimate of just replacing it with a 4.6?
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  #6  
Old May 5th, 2009, 09:20 AM
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thousands and thousands. I am just getting things together for a head gasket on either or. ive got two 3.9's.
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Old May 5th, 2009, 11:56 AM
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Michael Bruzga
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Quote:
Originally Posted by rover4x4
thousands and thousands. I am just getting things together for a head gasket on either or. ive got two 3.9's.
Sorry, but i don't quite understand.
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  #8  
Old May 5th, 2009, 01:01 PM
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Quote:
Originally Posted by discoinjapan
Have you done a cost estimate of just replacing it with a 4.6?

4.6 is a lot more money/pain and suffering than I am willing to give up at this point. A 4.6 would be nice but I dont have the space or time to do the swap. I am happy with the 3.9 for the most part. a cam and some headwork would be easy and the gains should be noticeable.
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  #9  
Old May 5th, 2009, 01:23 PM
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Michael Bruzga
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Gotcha!
Either way will take some money.
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