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Year. Correct me if Im wrong. SS16 1973-1976 16/6 twin 1977?
 

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My spoon is too BIG!
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I think the 16/6 used a different model Onan. B48M i think.
 

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My spoon is too BIG!
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both should be about the same. minus the color. same axles and trans as far as i know. Regardless of the Onan that is on it they ae awesome engines.
 

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SEARS TRACTOR COLLECTAH
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Grizzly, The SS/16 and 16/6 are basically the same chassis/power train. The SS/16 had a fiber glass dash, steel fuel tank, and a 4 pinion rear end. (1973-1975) The 16/6 is the same but with a few upgrades such as plastic dash with 3 way switch for electric lift, larger 3 1/2 gal fuel tank, larger steering wheel, and heavier duty 6 pinion rear end. (1976-77). Note that the changes to the 16hp twin were made in 1976 and was still called the SS/16. Then in 1977 they renamed it the 16/6. But both machines still feature the Onan BF 16hp. - Brad
 

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The 1973-1975 Sears SS/16's have thicker frames than the 1976-1977 models. Not all parts are interchangeable. You will need to go through the parts lists for each model number on Sears Parts and figure out which parts are interchangeable.
 

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The early SS/16, had key'd axles, the later had splined axles.
 

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Seems I've seen no mention of 16/6 machines with the Briggs L head horizontally opposed twins? I have two of them with 1977 dated engines.
 

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Hmmmmm, I forgot about those L head twins. You don't see many of those.
 

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SEARS TRACTOR COLLECTAH
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Seems I've seen no mention of 16/6 machines with the Briggs L head horizontally opposed twins? I have two of them with 1977 dated engines.
I have one of those too. It was introduced in 1978 called the GT/16. Really rare tractors. The engines never held up as long as the onans, leading most of them to there demise. The briggs model 40, 42 and 46 was a great engine, after all B&S made them from '76 to 2002. All of them had cast iron cyl liners, some of the later Twin Plus and Diamond plus models had an oil pump and spin on filter.
 
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