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thirt4 · 07-10-2013, 10:51 PM

My 85 HP flattie in my 1934 always ran cool. It was overbored .045 with Henry aluminum heads. Never got above 180 degrees whether in town or in the mountains back in SD. Just purred along.

My '53 Merc also runs cool, about 170 to 185 or so. No thermostats in either engine. The Merc is bored .030, 4 inch stroke, Jahn's pistons, Isky 3/4 cam, Offy heads and intake, new MSD Electronic distributor and MSD coil and most importantly.... TRUCK Water pumps. These pumps have, (IF I recall correctly) 14 fins in each. I just recall they had a bunch more fins than the old car water pumps that had been on it. Then it ran warmer so I put the truck pumps on that had the most fins. There are also truck fins that have fewer fins so make sure if you change, that you get the set that has a ton of fins.
I have the Merc out now and up for sale. Time to maybe change to something else.

07-10-2013, 10:51 PM	#43
thirt4 Senior Member Join Date: May 2010 Location: Arizona, USA Posts: 288	Re: Overheating Flathead My 85 HP flattie in my 1934 always ran cool. It was overbored .045 with Henry aluminum heads. Never got above 180 degrees whether in town or in the mountains back in SD. Just purred along. My '53 Merc also runs cool, about 170 to 185 or so. No thermostats in either engine. The Merc is bored .030, 4 inch stroke, Jahn's pistons, Isky 3/4 cam, Offy heads and intake, new MSD Electronic distributor and MSD coil and most importantly.... TRUCK Water pumps. These pumps have, (IF I recall correctly) 14 fins in each. I just recall they had a bunch more fins than the old car water pumps that had been on it. Then it ran warmer so I put the truck pumps on that had the most fins. There are also truck fins that have fewer fins so make sure if you change, that you get the set that has a ton of fins. I have the Merc out now and up for sale. Time to maybe change to something else.