Help me decipher my engine

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Jul 9, 2015 | 08:01 AM

dstraw

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Help me decipher my engine

I know that this is not the original engine in my 1974 F100......

Can anyone help me figure this out?

This is the sticker on the valve cover which is identical to the one on the oil pan.

Jul 9, 2015 | 08:50 AM

HIO Silver

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From: NorCal

H3 - August 3

Jul 9, 2015 | 08:52 AM

dstraw

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What Year?

Jul 9, 2015 | 10:43 AM

HIO Silver

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Dunno. The decal doesn't appear to have that information.

Heck, I dunno even what engine is pictured.

Jul 9, 2015 | 10:52 AM

flowney

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We can start to narrow this down by counting the bolts on the valve cover:
2 bolts: 239/256/272/292/312 (produced from 1954 to 1964)
5 bolts: 332/352/360/361/390/391/406/410/427/428 (FE engine)
6 bolts: 221/260/289/302/351W
7 bolts: 429/460
8 bolts: 351C/351M/400

Jul 9, 2015 | 10:54 AM

dstraw

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It's a 302, built in the Windsor #2 plant, Aug 3rd, but I don't know what year?

Jul 13, 2015 | 09:52 AM

dstraw

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Am I reading this to mean that the "B" indicates that I have a 1971 engine?

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Jul 13, 2015 | 10:30 AM

dstraw

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It has a thermactor choke, the heat stove exhaust manifold system.

Jul 13, 2015 | 10:33 AM

#10

bkaul

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From: Knoxville, TN

A hot-air choke is not the "thermactor" - thermactor was Ford's name for oxidation catalysts, and the associated air pump ("smog pump" in the terms of may around here) was the "thermactor air injection system".

However, other details of that decoding document indicate that the calendar year should be on there (which it isn't), etc. so it's possible the letters coded differently in different years.

Jul 13, 2015 | 10:35 AM

#11

dstraw

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Okay.....glad all that junk is long gone on this engine.

Jul 13, 2015 | 10:49 AM

#12

redroad

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From: Pa.

What are the values in the green box ? Those calibration values can give you the year also .. For example here you would search C62G-R0 ..

Jul 13, 2015 | 10:55 AM

#13

dstraw

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Jul 13, 2015 | 11:15 AM

#14

redroad

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From: Pa.

I'm looking through my files .. It looks something like this .. Note the calibration on right .. That's of course not yours but is a photo I had quick access to .. So let me look to see what I come up with ..