It sounds like this is a "reman" engine. Major engine reman shops use the screwed on or riveted tags. If the engine was done by one of these places, most likely they took a cut of the top of the block, and this could remove the factory numbers.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

thanks Charlie..i suspected something like that..too bad..it does have solid lifters so i guess its pre 1980 and it does look like its a rebuild..actually looks pretty good inside except it looks like no one ever changed the oil..

The only things you need to be concerned about, as for the year, for parts, is: solid/hydraulic valve train, and cast/forged crank. Everything else will not make any difference in the year. You need to be more concerned with over/under sizes, that were used during the rebuilding process.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

how can i tell if its cast or forged crank?

1975 and earlier used a forged crank, 76 and up is cast

-dave

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what part of "illegal" is so confusing???

No, actually, it's more complicated than that. The changeover from forged to cast was in the middle of 1976 production. All 1975 slant-6s have forged cranks, some 1976s have forged, some 1976s have cast, and all 1977-up have cast.

This is for US/Canada/Mexico production; other plants worldwide may well have stayed with forged right through to the end. (Argentina-Slantsixer?)

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

That is just plain wrong -

77 and up would be cast cranks.

Whoops, bad things happen when I post before breakfast. I've fixed it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The problem Valiant Effort is having, is, he doesn't know the year of the engine. I have been looking for my bearing book, so I could post the bearing sizes for the cast/forged crank, but it is misplaced.
The forged crank has a 1, 2, 4, main bearing width, slightly larger then 1 inch. The cast crank has a 1, 2, 4, bearing width less then 1 inch.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

yes, that is true, I just go with the "76 up" statement when I am browsing the local yards to avoid getting a cast.

truth be told, I have have never had a crank or bearings fail anyway

-dave

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what part of "illegal" is so confusing???

thanks again charlie..I will measure them and let you know..

I also have a remafactured engine with a riveted tag on the block right side front just above the oilpan. It is painted black. My truck is a 67, but now the engine--block and/or head could be almost anything. I do have spark plug tubes--they are moist.

Guessing from the posts, I am looking for an earlier block with a forges crank, and a later head with hydralic lifters?

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1967 D100 /225

Some of us catch on slow, and some of us don't.