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Old 06-03-2013, 12:08 PM
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Flathead to chev trans & cooling question.

Loved my flatty 32 with a muncie. Now doing a 33 and installing a 50 merc. and wish to use a Muncie again. Anyone done this recently and without electric fan? I want to keep it early hot rod so no electric fan. I know the engine bay is tight and late Flattys are belted a little different. Stock radiator. Thanks

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Old 06-03-2013, 11:06 PM
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Originally Posted by rdpaxton View Post
Loved my flatty 32 with a muncie. Now doing a 33 and installing a 50 merc. and wish to use a Muncie again. Anyone done this recently and without electric fan? I want to keep it early hot rod so no electric fan. I know the engine bay is tight and late Flattys are belted a little different. Stock radiator. Thanks
I guess I don't understand. What's wrong with using the stock belt, fan and pulley system?
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Old 06-04-2013, 07:08 AM
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My understanding is that the 2 belt 50 merc and fan system, interfers with the stock upper tank of the rad. I know that I only used a single belt on my 32 with the 59 AB and drove the fan with a home made fan idler. The Merc intake is different as well as the water pump pulleys. So even with truck pumps you must deal with the twin belts. Or do you scrap everything 50 merc and attempt a single belt like the earlier cars and my 32.
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Old 06-04-2013, 08:44 AM
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The original 33 belts/pulleys and the Merc belts/pulleys just don`t interchange 100%. The old engine and the late Merc indeed have hoses up front but along with the top mounted distributor, the hoses are troublesome. I know cause a friend had a 37 ford and attempted the late model ford swap. The fan is the major concern.

Until you actually do the swap, one just cannot imagine how much difficulty there is. At the time I had a lot of gathered flatty parts and nothing seemed to get an easy solution to driving the fan. I think the solution is the single belt like I did on the 59AB and make the fan idler so as to clear the upper rad tank. I used the 5/8 wide belt then so it looks like most of the pulleys will have to be 59 and earlier or the HD pulleys of a truck.

I was hoping someone had done the swap and remembers what to mix and match to fit the 33.
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Old 06-05-2013, 09:34 AM
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Kudos for taking the road less traveled. I think you answered your own question however. Did you use a Trans-dapt (Bendtsen's) adapter for the flattie to muncie?
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Old 06-05-2013, 12:30 PM
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Well if I recall correctly, Speedway sold me an offy to mate the two. This was the style that used the clutch release shaft from the flatty. Now I need the other style adapter for the next project and that uses the chevy throwout arm and brg. which Speedway also sells but pricey. I think 30 years ago I paid 100. I could actually use 2 of the chevy adapters asap.

The other projects include a 40 PU with another trick of mine. Flatty and GM 1981 Van/lite truck New Process 3+1 O.D. trans. This gives you over 20% return in 4th. This is almost a direct bolt in over the Munci 4 gear. Why this? Cheap O.D. vs. the T-5.
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