Thread: 318 poly vs a 413

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It's been done, of course, Jim, but it will be far from a "drop in".

No. The transmissions won't interchange. You'll need a 727 for a 413 (or any other big block Mopar).

I'm not familiar with the radiators that came with the polys but I'd guess the hose fittings are located differently so you would have to relocate them or pop for another radiator. The manifolds won't hook up to a big block so you will need a new exhaust system. If your car has a 904 transmission you'll need a shorter drive shaft (the 727 is quite a bit longer than a 904).

I'm relying on my ever deteriorating memory for this information so I'd better shut up and defer to Techinspector1 or somebody else who knows what he's talking about......

A bit of information about 413's: The ones used in trucks and motorhomes are different in a number of respects from those in cars. The car ones are the ones to go with.

Now I've probably discouraged you completely. Didn't mean to.

Jim