10-26-2004, 12:16 AM
On my first 2.5 I swaped the stock head for a CNR head. It dropped my temps quite a bit from where they were (like 50 degrees, it seemed). My motor was toast after 2 gallons, the piston/sleeve blew chunks. I didn't really touch the needles at all from the time I bought it to the end of the 2 gallons. It was running lean the entire time. You should be able to get good temps (260-290 (IMO) with the stock head. I had a 2.5 last 5 good, fast gallons with those temps. Then it blew chunks