what can i do to a stock industrial 413 to get more power out of it other than adding another carb? its got the motorhome heads and the high rise water pump.

Seriously ..

Find something else to work with

WHAT is this going in ? ...

A POS ?

Come on now .. that moder is what made Mopar KING of the RV and "dump-truck" market for years !!

It has some short-comings .. but that can be remedied.

The short comeings can be remidied by replaceing pretty much every part of the engine. Heads flow worse than a 360 head and bigger valves and porting are not gonna help much. The cam is obviously very puny, It has very low compression so it needs new pistons witch by the time you buy custom pistons you can buy off the shelf 440 pistons and a 440 block for the same dollars that will make more power. The only things I would re-use would be a crank, rods and mabey a few bolts

Hard to address one critical area and see much gain on an engine that has that many short comeings for building HP. It can be built to make a lot of HP even with just 413 inches but it will cost more than makeing more power from a 440 would. It would all look the same from the outside when done too.

Some of the stuff is right-on .. like compression and the JUNK cam ... but the heads ? ...

Are PERFECT for what they were designed for. For slow-speed operation ...and they give HEAVY DUTY new meaning.

I have seen plenty of RV and truck motors ...where the heads were TOASTED.

I have NEVER seen a 413 industrial head hurt in any way.

(image - Doc mooning bigdad !)

Roger that .. they are JUNK for anything HP... but if you have a tow-rig or a motorhome .... there is no better Mopar cyl head available.

I have two projects that I am having some R&D work done ON THOSE HEADS ...I will probably have a TWO GRAND in the first set.

Then there are others that run Mopar powered MH's that are interested in those heads if they help low--speed performance and MPG.

WHATEVER
Thats a POS for a starting point for any project
Argue with someone who cares


JUNK

it is a heavy duty engine. i am using it in a truck for the low end. got a granny 4 speed behind it. as for low end torque, what should i do? this motor has 12xxx miles on it, so its not warn out. barely broken in. again, i dont plan to get a ten second car with this, i know. its for torque, so i thought i'd ask the pros here. thanks in advance.

OK There is the problem you posted a question, on a race site that looked like you wanted a race motor. Now that we know what you are really after, you should get the answers you wanted.

The same as you'd do with a ny other engine..cam,exhaust and so on.I don't know what the specs are on the 413 cam,but maybe something like a Comp Cams old hi energy or the stock 440 cam for starters...

In that case slide a 440 short block under it, that will give you another 50lbs TQ even if it was a cast crank motor home short block.