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RB25DET head be changed with a neo head?

Eric0
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Eric0 Enthusiast

Eric0

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Posted

Hey everyone, 

I recently discovered that my camshaft had been over tighten when installing the head back on my motor. This caused the camshaft to bind and SNAP. Anyway, so now the front cam cradle is roughly .003in lower than the rest of the head after machining the scratches. So now I need a new head, as I looked online, I seemed to find a lot of RB25DET Neo heads but no series 1 or series 2 heads. Is it possible to switch everything over to the neo head and bolt it up to a series 1 block? If not, does anyone have a good condition series 1 or 2 head for sale?

Thank you!

GTSBoy Grand Master

GTSBoy

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Posted
8 hours ago, Eric0 said:

How much would the compression increase? Enough for a thicker head gasket to lower it adequately? Is it worth going the neo route?

No, my best estimate, without actually doing all the measurement and calculation required, is that the comp. ratio will increase by about 15%.  That is faaaaaar too much to take up with a head gasket.  You will either need Neo pistons, or a vanilla RB25 head.

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