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EFV-8 Club Forum / General Ford Discussion / Engine nummbers

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Discussion Topic: Engine nummbers -- page: 1 2

TomO

01-08-2018 @ 6:59 AM

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I would rethink the bore size. The early blocks did not have the even cylinder wall thickness of the later blocks and boring one .125 over stock can lead to overheating problems and cylinder wall failure. The max oversize bore of the blocks without sleeves is .0625. If you get a sleeved block, you will have to install sleeves in it again. I had the sleeves pulled and the bore cleaned up for a 3 3/16" bore on an early block. It ran hot all the time that I had it.

If you want to increase the cu. in., get a 4"crankshaft and keep the standard bore or a standard oversize bore. This will give you more torque at all engine speeds as well as more HP.

Tom

41fatty

01-08-2018 @ 3:51 AM

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According to my green 41-48 Ford book, the correct engine for my early 41 Deluxe coupe is a 81A-6010A or more likely an 81A-6010B. These engines also have raised exhaust ports (about 5/16ths) I'm looking for a rebuilt one with bigger pistons (3 3/16ths), maybe a hotter cam for better performance but complete stock appearance.

TomO

12-29-2017 @ 8:38 AM

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I believe that the thin steel sleeves were introduced in the 1938 model year and discontinued in the 1941 model year.

The idea behind them was to have an inexpensive rebuild and keep the stock bore.

Tom

MICHV8

12-29-2017 @ 5:27 AM

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What years were cylinder sleeves used? And what was the reasoning? Simple forward thinking for longevity/maintenance?
Thanks!

TomO

12-28-2017 @ 7:06 AM

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The drawing that I attached to my previous post contains all of the information that you will need to obtain a correct 1941 block. There doesn't seem to be any records of what the casting numbers mean and all blocks did not have them.

Tom

40 Coupe

12-28-2017 @ 5:14 AM

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Do not look for the 81A number on the 1941 block. The 81A was used from 38-40.

41fatty

12-28-2017 @ 12:03 AM

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Any casting stamps I should be looking for? 81-a or such

TomO

12-22-2017 @ 8:54 AM

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If you are looking for the correct engine block for your 41 Ford, it would be one that has a slightly raised deck for the intake manifold. Only the intake platform is machined, the rest of the top of the block is just as it came out of the casting mold.

See attached photo from the internet

Tom

42wagon

12-21-2017 @ 11:27 AM

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On the top of the transmission housing near the little inspection door you should find the serial number *18-serial number-* For a 41 Ford the number will be between 5896295 and 6769035.
You should also find (hopefully) the same serial number on the top of the left frame rail somewhere between the front cross member and the firewall. If looking for it on the frame be gentle, the number is easily erased by aggressive brushing, grinding ,scr*ping ,or sanding.

41fatty

12-21-2017 @ 8:10 AM

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Thank you, I still have the original trans. as i have rebuilt it twice after 60,000 miles. Now looking for an 81-A or 81 AB engine. Is this correct or even obtainable?

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