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deuce_roadster · 10-16-2019, 08:34 PM

The Merc crank makes 10x more difference then the bore. If you are just driving around and not racing, I would leave it at .040. In fact, I have a NOS 59 series engine in my 40 coupe and left it with stock 3 3/16 bore, swapped out the crank for a 4" stroke, Ross pistons with metric rings, mild cam and 390 4bbbl Holley and it has LOTS of power. No way was I going to bore some life out if it just because I could.

10-16-2019, 08:34 PM	#8
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,800	Re: block quandary The Merc crank makes 10x more difference then the bore. If you are just driving around and not racing, I would leave it at .040. In fact, I have a NOS 59 series engine in my 40 coupe and left it with stock 3 3/16 bore, swapped out the crank for a 4" stroke, Ross pistons with metric rings, mild cam and 390 4bbbl Holley and it has LOTS of power. No way was I going to bore some life out if it just because I could.