Went to the dealership yesterday to get a thermostat and some other stuff for my 92 rs with a 305 tbi and the guy said there were 2 different size thermostats and I had no idea which one to get. I was really suprised because I thought all sbc's had the same thermostat. What gives and which one is the right one for me?

 

Odd. I got a 92 RS and it clearly takes the "standard" sized SBC thermostat, just like a billion other small blocks.

Two different "sizes"?? Can't imagine that. Maybe he's confusing the 3.1L V6 RS motor and the 5.0L V8 RS engines?

 

Yeah, thats why I thought it was odd too. I even gave him my engine code, which is E, and he said there are two thermostats for my car, and asked me which one it was. I had no clue so I didn't get one.

 

i was thinking that he may be confused and was thinkign about the TBI or TPI intake (not sure if there are different sizes on then but to someone to looks really fast the TBI and TPI look alot alike LoL TPI TBI TBI TPI TPI TBI TBI TPI TBI TPI TPI <~~~ see

 

I just called the dealer again to make sure he didn't make a mistake accidently and a different guy said the same thing. He said that there were 2 different thermostats listed only for engine code E, aka 305 tbi. One being 52 mm and one being 58 mm I think he said. He also was confused as to why this is. Anyone have any ideas or experience with this?

 

have you looked at the RPO codes for the car?

 

What would that do?

 

well i ran mine today and i remeber seeing some info aboutt he colling system so maybe it will tell you the size you need. its worth a try.