I ran 15 degrees on motor and spray with a 75 shot. Never a problem.
Spraying 150 I burned a plug with 15 degrees and hosing it after sitting in cruise traffic @ 200 degrees. I have sprayed 150 a lot with 15 degrees while the engine is running cooler though with no problems.
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1988 Mustang GT
11.8 @ 123 (7/14/01)
1992 BadAzz Wrangler
1993 Explorer
See my car at:
www.mustangworks.com/cgi-bin/moi-display.cgi?179