“Duramax fan”

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tayto

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Duramax fan is similarly sized to the TBSS 6.0L fan. The fan bolt pattern is the same between the TBSS and Duramax. The 6.0L severe duty clutch threads on a Vortec water pump. Not sure what clutch someone would use to marry it to the TBIs 4 stud arrangement.
I spent some significant time trying to find one that would work without modding and no luck. I settled on the plastic 11 blade discussed above.
 

PlayingWithTBI

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And this fan blade bolts to the factory fan clutch in a 5.7? I’m thinking about going back a mechanical fan.
Not sure what clutch someone would use to marry it to the TBIs 4 stud arrangement.
Yes, the 11 blade fan from the 98 C1500 bolts right up to the TBI clutch in my 88. I don't remember what clutch it has (I think it's HD) but has been working fine for months now. At least it got me through the desert summer with no issues. I don't know about fluid dynamics involved in spinning the fan but, I wouldn't think you can hurt it with the little bit of added resistance from the 11 blade fan, we'll see.
 

L31MaxExpress

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The standard fan mount is a 3.25" bolt circle. The Duramax and TBSS use a 3.81" bolt circle.
 

454cid

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The standard fan mount is a 3.25" bolt circle. The duramax and TBSS use a 3.81" bolt circle.

Exactly. Its a larger bolt circle. 3.81" vs 3.25".

I see. I thought you were talking about the 4-stud pattern to the water pump. I assumed the blade bolt pattern was the same. I'm not familair with the TBSS.... or the Durmax other than looking at one or two forsale.
 
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