The Ford Barn

Nonewstuff · 11-22-2022, 05:50 PM

I am rebuilding a 1940 Mercury engine for my traditional 29 Roadster build. I need advice from the experts. My assumption is that since this is a Mercury block with a std. 3 3/16 bore I can overbore safely the same as a later block. It is currently std. I am 90% sure it is a Mercury block. It has the freeze plugs in the rails which make it a 38-40. The center water passages are triangle at top, circle in the middle and trapezoid at the bottom making it a Mercury. Am I correct in my thinking. Thanks for any input.

11-22-2022, 05:50 PM	#1
Nonewstuff Junior Member Join Date: Oct 2021 Posts: 1	1940 Overbore Question I am rebuilding a 1940 Mercury engine for my traditional 29 Roadster build. I need advice from the experts. My assumption is that since this is a Mercury block with a std. 3 3/16 bore I can overbore safely the same as a later block. It is currently std. I am 90% sure it is a Mercury block. It has the freeze plugs in the rails which make it a 38-40. The center water passages are triangle at top, circle in the middle and trapezoid at the bottom making it a Mercury. Am I correct in my thinking. Thanks for any input.