There are lots of posts on this subject, and as I recall, 1350 is generally recognized as a safe "never exceed" temperature for pre-turbo. Some even suggest 1300 as an upper limit. For more back-up info on this, suggest you do a search using key word(s) such as "EGT gauge", "probe", or "temperature. " Good luck.
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'97 Ext. Cab 2WD 35K mi,5 Sp Man 4. 10, ISSPRO Pyrometer & Boost
[This message has been edited by gchas (edited 01-01-2001). ]