Where do the weights go on a 360/727 converter?

Posted By: 69L78Nova

Where do the weights go on a 360/727 converter? - 12/18/10 03:51 AM

I am putting the 727 back in my 78 Fury. I dont have the original converter anymore, but I do have a stock converter out of a 71 340 E-body. I need to weld the weights on the 340 converter. I have the new weights, but I dont have the template. The 340 converter does have a drain plug, but I cant remember exactly where they should be positioned. Does anyone have a pic of a 360/727 converter? I have the 2 smaller individual weights, not the larger single weight. Can anybody help? BTW, does anyone know the stall speed of a factory 340 converter in 71? It think its around 2000-2200 right? It will be going behind an E58 360, with an XE256 cam, headers, 2 1/2" duals, 3.21s, in a big old boat

Thanks in advance!

Posted By: 340swing

Re: Where do the weights go on a 360/727 converter? - 12/18/10 04:14 AM

This is a 74 360 t/c out of a 727. The weights are on either side of the drain plug.I can't post pictures for the last two days. I have posted many before is the site having troubles or is it me?Got it,

Attached picture 6363764-IMG_0487.jpg

Posted By: 69L78Nova

Re: Where do the weights go on a 360/727 converter? - 12/18/10 04:42 AM

Awesome! Thank you!

Now does anybody know the factory rated stall speed of a 71 340 converter?

Posted By: Alikazam

Re: Where do the weights go on a 360/727 converter? - 12/18/10 02:53 PM

Could always get the B&M Flex plate so you can use a neutral balance converter with the 360. Just another option for you that would not require welding!

Good luck.

Posted By: demonH1B

Re: Where do the weights go on a 360/727 converter? - 12/18/10 03:16 PM

The fsm lists the stall of the '71 340 converter
as 2150-2450, installed behind a
'71 340 engine.

Posted By: Yancy Derringer

Re: Where do the weights go on a 360/727 converter? - 12/18/10 06:20 PM

Anybody who thinks they're gonna balance a high performance engine by welding weights on from a picture and a tape measure are sadly mistaken........................

Posted By: RodStRace

Re: Where do the weights go on a 360/727 converter? - 12/18/10 06:28 PM

Quote:

Anybody who thinks they're gonna balance a high performance engine by welding weights on from a picture and a tape measure are sadly mistaken........................

I agree. There is a sheet that comes with the MP weights, but I'd still go with the B&M SFI balancer at under a hundred bucks and be sure it's right...

Posted By: RapidRobert

Re: Where do the weights go on a 360/727 converter? - 12/18/10 06:32 PM

Someone way back did post a meaurement & maybe a diagram to get em located just right.

Posted By: 69L78Nova

Re: Where do the weights go on a 360/727 converter? - 12/18/10 07:31 PM

Quote:

Anybody who thinks they're gonna balance a high performance engine by welding weights on from a picture and a tape measure are sadly mistaken........................

Yeah, you do have quite a point. I was thinking about going with the B&M plate, but have heard about some vibration issues. This 360 is far from a high performance engine, but thinking about it logically, I might just try it for $80. Its too mych of a pain to pull both crossmembers (transmission AND torsion bar crossmembers) if the weights are welded in the wrong place. I just though there was an obvious location for them. But there does appear to be no room for error. Ill just order the plate. So its going to be the #10236 plate then right?

Posted By: Crizila

Re: Where do the weights go on a 360/727 converter? - 12/18/10 08:28 PM

Quote:

Quote:

Anybody who thinks they're gonna balance a high performance engine by welding weights on from a picture and a tape measure are sadly mistaken........................

Yeah, you do have quite a point. I was thinking about going with the B&M plate, but have heard about some vibration issues. This 360 is far from a high performance engine, but thinking about it logically, I might just try it for $80. Its too mych of a pain to pull both crossmembers (transmission AND torsion bar crossmembers) if the weights are welded in the wrong place. I just though there was an obvious location for them. But there does appear to be no room for error. Ill just order the plate. So its going to be the #10236 plate then right?

You don't have to pull the torsion bar X member, but I agree with the B&M flex plate in place of weights on the convertor. I did that some years back with an E58 motor with no vibration problems.

Posted By: RapidRobert

Re: Where do the weights go on a 360/727 converter? - 12/18/10 11:28 PM

You have the weights in hand. If you can find the template (& iirc the locating measurements on the diagram (posted on here) were down to at least 2 decimal places) I'd use em. For the most part it made em smooth (enough) from the factory and for sure cheaper than shelling out for the plate and the plate is not perfect as either one can only get it (that end of the crank) so close

Posted By: JohnRR

Re: Where do the weights go on a 360/727 converter? - 12/19/10 12:59 AM

Do the B+M plate , that way if you don't like the convertor you have you can easily get another that is neutral balance and swap it in.

Posted By: Alikazam

Re: Where do the weights go on a 360/727 converter? - 12/19/10 01:56 AM

Part #10236 looks correct to me.

Posted By: @#$%&*!

Re: Where do the weights go on a 360/727 converter? - 12/20/10 01:36 AM

Quote:

I am putting the 727 back in my 78 Fury. I dont have the original converter anymore, but I do have a stock converter out of a 71 340 E-body. I need to weld the weights on the 340 converter. I have the new weights, but I dont have the template.

The nice thing about the weighted flexplate is that you can use neutral converters and keep the flexplate with the engine. If you can't get the flexplate, the Mopar Chassis manual has the specs for removing weight from a flywheel, you just need to add the weight 180 degrees out from the diagram. The spec is 16.79 inch-ounces for a 360. That just means that if your weight is 16.79 ounces it needs to be 1.0 inch from the center. Similarly, if the weight is 1.0 ounce it needs to be 16.79 inches from the center. It's just the weight times the distance that must equal 16.79 inch-ounces. The factory spot welded the weights on but most people have mig welders instead. To adjust for the added filler wire you can simulate the weight of say 10 seconds of welding by running the welder in the air and cut off the wire that comes out and put that on the scale with the weight you intend to add. This can be done as accurately as the B&M plate is made. How good is your math and how accurately can you measure? The hardest part is getting the angular position right, but that's the least sensitive aspect and a couple of degrees error isn't a big deal.