magnum heads

[1970-cuda340]

I have a 1968 340 block and a 1992 magnum 318. What exactly do I need to get or do to get the heads useable on the 340?  I see the magnum heads has pushrods with oil passages.
Thanks!!!   

[mikerallye]

There is a book titled "How to Build Big Inch Small blocks" that  goes into great detail on this swap. I recall that the mag heads will use sbc rockers and must have the mag intake or drill out the LA intake to fit the heads. I have seen this swap discussed here as well. Search this site, it should be here. 

[matt63]

i"ve got Eddy Magnum heads on my 360LA block.  I just swapped pushrods for the oil thru type.  If you're swapping cam bearings you can block off the oil holes to the old rocker shafts but I didn't.  You will also need the Chevy small block stud mount rocker arms and of course Magnum intake and valve covers.  The Magnum intake has a different bolting arrangement than the older LA style and has 10 bolt valve covers instead of 6 IIRC.  You will need to learn how to properly tighten the Chevy style rocker arm nuts so they don't come loose on you.  If I had to do it again I would just stick with the older LA stuff.  I think I went with the Eddy Magnum heads because of the combustion chamber size and the great selection of inexpensive Chebby rocker arms.

[Chryco Psycho]

this why I usually use 308 castings

[1970-cuda340]

Doing a swap is a little more than i bargained. I think I will rebuild these j heads I have. Don't like the idea of chebby parts on my mopar anyhow

360-308 heads are a little hard to come by around here.

I do have a 1980 318 truck engine with factory 4bbl option complete in a 250 RAM. Think of anything I can use off that?

[Chryco Psycho]

1980 318 engines didn`t have much to offer