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

I would use any Hemi except the 413, the odd ball Hemi, parts are expensive! and they don't make alot of parts for them!
Put Hemi heads on the poly motor.

Pat

"......I would use any Hemi except the 413, the odd ball Hemi, parts are expensive! and they don't make alot of parts for them!
Put Hemi heads on the poly motor......"




The 413 is an RB engine not a Hemi (chrysler never made a Hemi displacing 413 CI).

Unlike some of the other Ploy engines the 318 will not accept Hemi heads.


I would say unless you already have a 413 I'd look for a 440. If memory serves correctly the 413 would be incorrect anyway as the 426 wedge replaced it in 65. While many parts interchange between the 413/426 wedge/and 440 pistons can be extremely expensive for the 413/426 engines. There's no replacement for displacement and the 440s are a lot easier to come by.

As big tracks said you will need a big block transmission.

Well, Jim (tuckpointer74), I just looked at my response to your posting and I see that I lied to you, and I don't even know you! I told you that if you install a big block Mopar with a longer transmission in your Fury you will need a longer drive shaft, and that makes no sense. I meant to say that you will need a shorter one.

Blame it on the dementia typical of some of us geezers. I have edited the response.

Mike is right on. If you don't already have a 413, sniff around for a 440. They are pretty plentiful and are comparatively inexpensive. You'll come out ahead both powerwise and financially.

Here is a quote by a knowledgeable guy who used to check in here ("Call Me Doc") regarding the 413:

"Motorhome and truck 413 engines usually have different heads than passcar engines; they have extra water jacketing around the exhaust ports and will not accept passcar headers or manifolds. They also use a unique intake, which is not a worthwhile performance piece, and many of them had 8-bolt cranks with a proprietary converter/flywheel hub length. Plan on using only the block; virtually everything else needs to be replaced right down to the water pump housing. Put yourself way ahead of the game and just find a 440... it'll be cheaper in the long run, and have more CID in the first place."

Take a look at the thread that quote came from. You might find some of it useful.

http://www.clubhotrod.com/forums/showthread.php?t=25076


Jim

[QUOTE=Mike P

The 413 is an RB engine not a Hemi (chrysler neve made a Hemi displacing 413 CI).

Unlike some of the other Ploy engines the 318 will not accept Hemi heads.



I undrestand that.
They quit the Hemi in '58 and introduced the Wedge head motor in '59 till '64 when the Hemi came back as the 426 Hemi. But alot of people call the earlier 413 Hemi's.

The wedge head engine was built in 350, 361, 383, 400, 413, 440

I was thinking of the earlier poly motors.

Pat

[QUOTE=HemiTCoupe;296841][QUOTE=Mike P
But alot of people call the earlier 413 Hemi's.[/QUOTE]

Ummmm, no, I think you're the only one.

[QUOTE=techinspector1;359334]

Originally Posted by HemiTCoupe

Ummmm, no, I think you're the only one.

Why don't you go build something...Oh Thats right, you don't/can't!!!!!!!!!! All you do is tell other people what to do, and confuse them, you know "If you can't dazzle them with brilliance, then baffle them with bull shit!"

No, I'm Not the one that thinks it, I have heard many people say it over the years!

Even if it's wrong, it's on this site! --> http://www.who-sells-it.com/r/chrysler-hemi-413.html

Pat