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Which thermostat?

2K views 8 replies 3 participants last post by  Mikey von 
#1 ·
I have searched and there is a lot of conflicting information.

I have the high output serpentine water pump and the stock single thermostat crossover. I want the 195 degree. Which thermostat should I use on my 6.2L?

Part #?

Is it the RS 354? Hopefully something from either Napa (local) or Summit (will be placing a large order) to save on having to pay extra shipping.

thanks!
 
#2 ·
Acdelco is the only one I have had work here is the # 131-91(acd#)

G M # 12559338
 
#4 ·
If you have an 88-93 water cross over like I do you should have the big 64mm bypass blocking thermostat.
 
#9 ·
I think the t-stat crossover that I have on there and plan on using will not work with the '94 serp setup. The outlet interferes with the alt/idler pulley bracket. I am guessing I need the single stat crossover from a serp setup 6.x.

 
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