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View Full Version : 2001 XJ stroker build: keep 0331 head?


anthrax323
December 4th, 2017, 12:54
My 2001 XJ made it 240,000 miles before breaking a piston skirt. I can say with 99.999% confidence this is the original 0331 head (non-TUPY), as I've owned it since ~110,000 miles. Never had a single issue with it.

Given that it made it this far, is it reasonably safe to assume that I have one of the good 0331 heads? Or should I plan on locating a TUPY or other aftermarket head as part of the build?

tech1001
December 4th, 2017, 14:17
If your building a stroker you want more power , I would look at a performance head to add to the power . the stock head is not good for performance even if you do a PNP on the head , the after market head was made to flow better to start with .

smokeyyank
December 4th, 2017, 14:37
I'd swap it. No sense in building the rest of the engine and having to worry about possible head issue.

lazyxj
December 5th, 2017, 10:13
If your building a stroker you want more power , I would look at a performance head to add to the power . the stock head is not good for performance even if you do a PNP on the head , the after market head was made to flow better to start with .

Check with Russ Pottenger, he can do wonders with a 4.0 head, no matter if it is a 7120, 0630 or a crack free 0331.
He recently supplied forum member RCP Phx with a built 0331 head, along with a stroker kit.
Read about it here. It's quite powerful.
http://www.naxja.org/forum/showpost.php?p=246520043&postcount=108

RCP Phx
December 5th, 2017, 10:19
I sent Russ a new CCH 0331 head that's supposedly like a TUPY head.
https://www.amazon.com/gp/product/B014E3RN9Y/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1