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Old 12-07-2006, 06:20 AM
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1935 Ford 221 V8 vs 239

This is probably a reach but I have a 1935 221 and a set of brand new 40 over pistons and an integral bellhousing 239 complete engine. To save me a bit of work is there a possibility that the early oversize pistons are close to the bore size and can be used in the later block - please? Or have I gotta spend money on the 239? I'm a cheapskate so I try to save me a dollar or two.

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Old 12-07-2006, 07:01 AM
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flathead pistons

The 221 should have a 3 1/16" bore while the 239 should have a 3 3/16" bore.

You can see that the .040 oversize 221 pistons will not work for the 239, but it was a good try.
Also,the 239 may have already been bored sometime during its life and may be even larger.

Paul S
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Old 12-07-2006, 07:06 AM
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Thanks Paul, I didn't expect them to fit, worth a try though.
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Old 12-07-2006, 09:22 AM
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Are you sure your 239 is a 239?? Since all flatheads prior to the 49-53 have integral bellhousings, I wondered why you used that as a descriptive point.
The fact is you can't really be sure whether an early flathead 24 stud engine is a 221 or 239 without pulling at least one head and measuring the bore. You see, the Mercury intro in 1939 was the 239 intro as well. The postwar blocks are marked 59 or 59A, etc. but may be small bore to use as replacements for the early engines.
Flatheadworld is filled with interchanges and combinations back and forth across the 21-stud line and the no-bellhousing line.
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Old 12-09-2006, 12:55 AM
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Thanks Pasadena,looks like theres hope for me yet! I'll pull a head after it cools down (it is 41 degrees C or 105 F). The engine actually in the 35 is a 24 stud and as you said, I guessed it would be a 239.

Cheers from Australia

Rob
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