1971 vs Mid-70's vs 1978 401's

[Lifted79CJ7]

OK, so I see a lot of stuff for strickly 1971 AMC 401's. So whats the deal with that year engine. I guess I should be asking, I have a 78 block with stock 58 cc heads and ran across these pistons:

http://www.fastengineparts.com/products_view.php?id=944

Anyone know of a reason why these wouldn't work? And if so, why is it that besides the 1971 info that you usually see listed by itself, you also only see a lot of parts listed up to the model year 1976 for the 401's? I don't think there was much of a change was there? Just wondering why the 71 is sooooo cool and my 78 is a dork! 8)
:-|
Jack

[jeepsr4ever]

dont bother with those....they dont make them anymore

[Lifted79CJ7]

I really don't care if they don't make them anymore, as long as they work. I am starting to run out of options for higher compresion pistons for under $450. Any suggestions? Come onnnnnnnn! You gotta know somebody!

And on a side note, do you know if the 1971 401 was different than later years?

[fuzz401]

they had the 50cc heads on then is about it i think

thouse pistons i think look like these
http://img2.photobucket.com/albums/v11/fuzz401/678f0450.jpg

http://img2.photobucket.com/albums/v11/fuzz401/0c8f3fcb.jpg

[jeepsr4ever]

different crank ends and different bolt pattern

[Lifted79CJ7]

Ahhh, gotcha. Thanks kids!