Magnum head and exh manifold ID

Orionsax7 said

That reminds me, is it possible to swap a magnum serpentine system onto an LA block?....

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Not without the Magnum heads.
There are extra bolt holes in the ends of the heads to allow the power steering pump and alternator to bolt up.
As long as you use the heads, timing cover, water pump, fan, pullies, A/C pump (if desired) and alternator it'll all bolt up.
You can use a flat tappet cam, but you need to use an AMC lifter and custom length pushrods so that the rockers get oil.

It really is easier (read: CHEAPER) to get a Magnum engine and start from there.

If you like the older appearance, the valve covers from an LA engine will bolt to a Magnum head, but, I believe, a spacer needs to be made to keep the stock covers from being hit by the rocker gear.
I'm told aftermarket aluminum covers will clear.

There's a fellow on the Yuppie-Snob Site, Moparts, who also loans a tool to convert Magnum heads over to use an LA intake.
Or maybe it's the other way around? I forget.

By the time you're done, it could LOOK like an LA with the serpentine stuff on it, but is it worth the hassles?

Mark.