jp heres one for you I bought a 84 and they said the motor was rebiult but the code on mine is 108c17 yes it is a 258 but what year would you suspect?

With nothing eles to go on I'd say 1981.
258's with the C code were built between 76 and 89 according to the info on the link I posted earlier. So an engine could have the same number and be built in 1977 but it would be a first generation 258 and would have come from the factory with 1/2" head bolts, a steel valve cover and a cast Iron intake manifold that would be bolted together with the exhaust manifold instead of the separate aluminum intake that came in 1981. but as I said before, heads and manifolds can be swapped, casting numbers are one sure way to tell. Here is a list I found, I haven't made any attempt to verify it yet.


1975-79 258 4.2L 1/2" Head bolts

Blocks: 3227445 and 3224098
Head: 3227258
Crank: 3214723

1980 258 4.2L 1/2" Head bolts

Block: 3235077
Head: 3227258
Crank: 3214723

1981-85 258 4.2L 7/16" Head bolts

Block: 3235444
Heads: 3933000, 3224480, and 3241656
Crank: 3235477

1986 258 4.2L 1/2" Head bolts

Block: 3227444
Head: 3933002
Crank: 3235477

<img src="/forums/images/graemlins/cheers.gif" alt="" />

thanks <img src="/forums/images/graemlins/kewl.gif" alt="" />

Where are the casting numbers located on the engine? I have looked but can't find it. Probably was right in front of me!

I've never looked for them but I imagine they are on one side of the block or the other. They may be obscured by engine mounts. If I remember I'll look at mine when the sun is shining and see if I can see! <img src="/forums/images/graemlins/smile.gif" alt="" />

On my 1984 258 the casting numbers are on the drivers side of the block, slightly rearward of the engine mount, 1/2 way between the bottom and top exposed edge of the block. Mine is hard to read because my 4.0 exhaust manifold partly covers it. I think with the stock manifold it would be eaiser to read. <img src="/forums/images/graemlins/cheers.gif" alt="" />