j-model head swap

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11 Jun 2006 18:25 #53771 by BigBlockT
j-model head swap was created by BigBlockT
is there any big gains swaping a j-model head on a stock z1-900?

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  • wireman
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11 Jun 2006 21:14 #53809 by wireman
Replied by wireman on topic j-model head swap
drops your compression by 2 numbers right off the top which puts it somewhere way south of where you want it with stock pistons.bigger ports and bigger valves though;)

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  • APE Jay
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11 Jun 2006 21:25 #53816 by APE Jay
Replied by APE Jay on topic j-model head swap
If you do something about the compression drop, it will yield good power improvement.

This is a very popular thing to do these days. What we do is set the customer up with a bigbore kit for the J model engine, and he runs a .040" spacer under the cylinder. Then he has the proper dome for that head, so the compression is right.

Jay

Post edited by: APE Jay, at: 2006/06/12 00:27

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11 Jun 2006 22:30 #53830 by nads.com
Replied by nads.com on topic j-model head swap
What is good power improvement in terms of, say the layman.

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