The Stovebolt Site Forums The Shop Area Engine Shop Engine swap 261-283

So I have this bellhousing with the small clutch arm opening:

http://i185.photobucket.com/albums/...57_1671900688342157356_n_zpsqdx9ajix.jpg

And the 283 is a 4 barrel from a 66 Impala with power pack heads. It had a PG behind so I need to find a flywheel that fits the 283 and also adopt to the clutch from the 261.
This shall then mate with the SM420.

Does anyone have the information about which flywheel to use ? I can buy a new one if I have to, but like to reuse old stuff if I can.

I already have throttle linkage and the engine mounts and will order a long water pump and some more stuff soon.
And also now have a solution for the foot starter.
Only thing left unknown is the flywheel.

Thanks for any advice.

You can use a flywheel from any small block V-8 from 55 through 86 and a 6 cylinder from 63 up. It will be a 168 tooth flywheel.
If you are planning to use your original clutch you will need to get the flywheel that matches the clutch. It could be either an 11" clutch or a 10" clutch. They are available used at swap meets, craigs list, etc. Napa also has them new.
Fred

But that means I could use any flywheel from any smallblock and just a standard clutch and that would work with the SM420 ?
Remember I have the bellhouse with the small arm opening. And I bought that just because I thought I had to use the 261 clutch.

Hmm... confused

Hy lastchancetowing, you will also need to install a pilot bushing in the end of the crankshaft to support the front of the transmission input shaft. Clutches for the the trucks came in a couple of different diameters depending on the size of the truck, you can either look for a flywheel that is drilled to accept the clutch from the 261 or purchase a new clutch which will fit the flywheel you end up purchasing, hope that helps.

The bellhousing that you are using fits V-8 truck engines from 55-59 and 63-67 and 6 cyl engines from 63-67. It will accept any 3 speed, or 4 speed transmission of that era. The throughout arm is the same as the 235/261 6 cylinder engine/bellhousing used.
As 3B indicates, the differences in the clutch would be the diameter. The clutch disc splines would be the same as well.
Fred

The problem is I can't ( or don't want to ) wait for several weeks when everything is apart.
I thought I could take any flywheel from a small block and adopt to the 261 cluth and that was it.

If I use another cluth the arm will not fit the hole, and I need another bellhousing.

I want to make the easiest thing, isn't that to use the 261 clutch and a 283 correct flywheel and if needed have it drilled to fit the clutch ?

But I still need a pilot bushing ?

One of these ?

https://www.novak-adapt.com/catalog/pilot-bushings/gm1-gm/

I have done several 6 to V-8 conversions on TF trucks and used the original throughout arm regardless of what size clutch (11" or 10") was used. I would personally use an 11" clutch with that vehicle/engine/transmission.You can try to get a measurement on the pressure plate to be sure. It's likely that being it is a larger truck it would have an 11" clutch. Then you could buy a flywheel to accept an 11" clutch. However, you can't take anything for fact for something that has been around for 60 years and has been worked on by numerous people.
I'm not going to comment about re-drilling a flywheel.
I would also use a new clutch, you only want to do this once,
Fred

You still need a pilot bushing, they are not installed on engines that came with automatic transmissions.

According to this thread it's a 11":

https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=975674

So I will try to find a flywheel here. Only issue I have now is what splines is on end on The sm420. I have read that the 2-ton had 35-spline but can't find it now. I must remove first it seems.

The SM-420 has a 1-1/8" diameter, ten spline input shaft.

Mike B

Thanks Mike.

What is preferred, a bronze solid one ?
Or a roller type one ?

http://www.oreillyauto.com/site/c/d...mp;pt=C0015&ppt=C0338#itemDetailTab_



I wish I could buy all of you guys a truckload of beers for your help.

Measure your clutch diameter when you pull your engine, however, 11" would handle larger loads.

Ed

Your truck may have come with the standard issue 11" Clutch Disc Stamped 3758678 or it could have come with the 12-7/8" HD Clutch Disc stamped 3758987.

Mike B

What is preferred, a bronze solid Pilot ?

Or a roller type one ?

http://www.oreillyauto.com/site/c/d...mp;pt=C0015&ppt=C0338#itemDetailTab_

Use the bronze pilot bushing.

Second.

Ed

Roller is just another moving part waiting to fail.

And perhaps ruining your input shaft.

Ed

I will use everything except the 261 engine.
The only thing missing now is the flywheel, and a pilot bushing. I have everything else.

Mike, will this one work then ?

http://www.rockauto.com/en/moreinfo.php?pk=593259&cc=1322211&jsn=443

I have hard times converting 1-1/8" to mm.
The pilot at Rock Auto has

Inside Diameter (in) 0.593 In.
Outside Diameter (in) 1.06 In.

1 1/8" is approximately 28.5 MM. There's 25.4 MM to 1 inch.
Jerry

The original part number for the Pilot Bushing is 3752487 (19/32 x 1-3/32 x 3/4) which crosses to a Doorman 690-014.

http://www.rockauto.com/en/parts/dorman,690014,clutch+pilot+bearing,1964

Hope this helps,

Mike B

Thanks, ordered now. Also ordered the throttle linkage. Now I have everything. Just fixing up the 283, new gaskets, rings, bearings. The engine was in perfect condition except for one bearing. This will be fun later this summer.

I just got it in my mailbox. HAHAHA dying. I got a pack of 5 !!

http://i185.photobucket.com/albums/x264/uffeg/20170711_094131_zpsmuwqeldj.jpg

http://i185.photobucket.com/albums/x264/uffeg/20170711_094013_zpsvnicdmr7.jpg