Huge number of changes/up-dates in one off season. Love to see all that work being done to go faster and be more reliable. Dedication right there. I personally like the 482-500 Cu In. package better than the longer stroke, but allot of expense to make the change. What RPM's were you turning with the 4.5" arm? Any issues, or just a cautious change to push it harder in the future? When we ran the Grocery Getter with the 4.5" stroke, we felt we needed the extra cubes to get that very heavy car moving. You are probably 400 lbs. lighter than we were. Best of luck this year.
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