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4dFord/SC · 09-03-2019, 10:36 AM

My '40 with a 221 flathead, Offenhauser heads, 4bbl carburetor, Fenton headers, and Columbia will comfortably do 70 mph indicated at 2800 rpm. Like Tubman says, 3800-4000 is as high as I would ever want to run it. I should think your set-up should do at least as well.

09-03-2019, 10:36 AM	#3
4dFord/SC Senior Member Join Date: May 2010 Location: Columbia, SC Posts: 1,579	Re: RPM range for 51 merc flathead My '40 with a 221 flathead, Offenhauser heads, 4bbl carburetor, Fenton headers, and Columbia will comfortably do 70 mph indicated at 2800 rpm. Like Tubman says, 3800-4000 is as high as I would ever want to run it. I should think your set-up should do at least as well.