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EFV-8 Club Forum / General Ford Discussion / Differences between 34 and 36 flatheads

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Discussion Topic: Differences between 34 and 36 flatheads -- page: 1 2

rbone

12-02-2011 @ 2:19 PM

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My '34 Tudor has a 59ab flathead - runs great, no issues. I have always had my eyes open looking for a good 21 stud motor in the event I ever wanted to really show my car. I have no plans to do that as I enjoy driving the car too much. But at the same time, I would like to have the means to do so if I ever wanted to.

I have found what appears to be a good 21 stud motor that appears to be out of a '36. According to the owner, it was rebuilt a few years ago. In the photos I have, the only thing I can see that is not original is that is has steel heads with a 68-XXXX stamp. I do not know if the bearings are babbit or insert. My understanding is that change occured in mid-36. Other than the 68 stamp on the heads and the bearings, are there any other visible differences between these years? If so, are these differences noticable externally if I was to ever want to show my car.

Also, if things look good, I plan to go and have a close up look at this motor. Any tips on what I should be looking for in addition to cracks in the block and heads?

Thanks in advance,
Ron

This message was edited by rbone on 12-2-11 @ 2:21 PM

supereal

12-02-2011 @ 5:49 PM

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More often than not, an old "rebuild" is a sign of trouble. Have a shop that knows about these old engines look at it before you put up the cash. '35 was a transition year at Ford, and you could find a babbit bearing engine, or the later insert type. Usually these very old engines were removed because of problems. I hate to be a wet blanket, but I've seen too many not to be skeptical.

12-02-2011 @ 6:24 PM

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One difference between '34 and '36 is the '36 will have the ventilated block and the '34 will not. The '36 oil pan has a vent slot in the front and the '34 does not. However, you could possibly use a '34 oil pan on the '36 block and defeat this ventilation system. I'm not 100% sure on that though.

JM

This message was edited by JM on 12-2-11 @ 6:26 PM

rbone

12-02-2011 @ 7:42 PM

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Thanks and keep the information coming. Supereal - don't worry about being a 'wet blanket'. I am looking for information to make sure I don't make a mistake.

I talked to the owner this evening and found out some more details about the motor. It was pulled running from a car that was being shown. It was not the original motor in whatever car it was in at that time. He said the car was being docked points because of this. He said he has just lost interest and now only deals with muscle cars. I'm not sure what to make of this.

I also read about the oil pan vent on the '36 and understand that the pans are interchangeable.

Please keep the information coming.
Ron

This message was edited by rbone on 12-2-11 @ 8:09 PM

Brendan

12-03-2011 @ 6:40 AM

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i got a 35 21 stud motor from a friend of mine for 500$.he said that it was rebuilt 30 years ago, i had a few issues with it that i had to iron out before i put it in my 36 pickup. 4 pistons where put in backward and i re -ringed it. if you can get your motor for a good price go for it. you may won't to open it up to see what is going on inside. Brendan

Can't spell my way out of a paper bag!

kubes40

12-03-2011 @ 6:45 AM

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The pans are in fact interchangeable. As are the intakes which of course are different 34 vs 36. And obviously, the fuel pump stand, carburetor, cylinder heads, etc. can all be swapped.
The biggest difference that can be noticed externally on each of these blocks is the cavity adjacent to each motor mount. The 34 block has both cavities at the same depth while the 36 block has one cavity (deep) and one shallow.
Sometimes referred to as the two knuckle test... you should be able to measure the depth by placing your fingers in each cavity to, you guessed it, to the second knuckle within EACH side (cavity) of a 34 block.

This message was edited by kubes40 on 12-3-11 @ 3:21 PM

rbone

12-03-2011 @ 3:46 PM

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Here are some pictures. Please let me know what you think the year of this motor might be - aside from the heads - and anything else that catches your attention.

Thanks.

rbone

12-03-2011 @ 3:48 PM

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pic #2

rbone

12-03-2011 @ 3:49 PM

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pic #3

rbone

12-03-2011 @ 3:53 PM

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pic #4

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