240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

head swap?

Old 06-07-2005, 03:44 PM
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head swap?

Hey guys, my Z is down again. I have discovered that my head is warped, and it is allowing water and oil to mix. I caught this pretty early, so no bearings are scored or what not, but I do need to get a new head/get it shimmed. I'd much rather get a new head that isn't warped so that it would be an easier fix, but I can't locate any Z's in Sacramento that have E88 heads on them. What other head could I put on my motor? I want to swap the whole complete head (camshaft, cam gear, valves, etc), so I need something compatible with my stock Z block (p30 I believe).
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Old 06-07-2005, 06:28 PM
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Fast 240

I went through three heads before I found one that could be reworked. How about milling the head you have?
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Old 06-08-2005, 10:29 AM
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A long time ago I tried a milling option to fix a warped head and it could be done, but it was kind of a pain (getting exactly the right new headgasket thickness and/or cam tower adjustments, etc., etc.). But, it does work. Or maybe try zparts.com or zcarsource.com and see what shipping one to you might cost, just to compare money to effort and see what your preference is.
good luck,
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Old 06-10-2005, 01:00 AM
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go to http://zccw.org/Tech/Engine/Combo.html to check out head-block combinations
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Old 06-10-2005, 11:14 PM
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You can have your head resurfaced. And run a stock or thicker head gasket, depending on what your engine compression is, or has been. Usually, 30 - 60 thousands off a head will straighted it for you on a Datsun head. If you go more than 60 thousands, start checking for valve & piston interference. You may then wish to explore the use of a thicker head gasket.

The head thickness, if surfaced will move the cam closer to the crank. Usually on the Datsuns, there are three alignment holes in the cam chain sprocket, usually marked 1,2,3. These were orginally installed to take slack out of the timing chain as it streached. I think its something like 4 - 6 degrees change between each position. With a stock chain, you may be able to set the cam sprocket in position #2 or #3, to tighten up the chain without needing to worry about shimming. And if your running a wild cam, you could always buy an aftermarket adjustable cam sprocket and set your cam and chain where ever you want it.

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