89S 350 TBI Head Gasket Replacement Project

[89Suburban]

it cleaned up pretty decent....

 

[Old77]

Did you go with a 180 degree tstat?

 

[89Suburban]

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[89Suburban]

Did you go with a 180 degree tstat?

It's a *195. Of course today my mechanic told me today I should take it out and put in a *160.

 

[Old77]

 

[HotRodPC]

If I'm, not mistaken, that EGR vavle looks stuck open to me. Usually the pintle will be below the mouting surface 1/4 inch or so, not flush or recessed like it is. Or is that just what I see in the pic?

 

[89Suburban]

He says that that GM made the heads those years thinner walled on purpose to hold more coolant and to run a hotter thermostat to get better on the sniffer. And in doing so you have the common head cracking issue on these motors. So I am going with a thicker walled, aftermarket replacement head and a cooler thermostat.

 

[Old77]

He says that that GM made the heads those years thinner walled on purpose to hold more coolant and to run a hotter thermostat to get better on the sniffer. And in doing so you have the common head cracking issue on these motors. So I am going with a thicker walled, aftermarket replacement head and a cooler thermostat.

sounds logical to me. I've just never heard of using a tstat as low as 160 before but I'm not a mechanic so that's not saying anything

 

[89Suburban]

If I'm, not mistaken, that EGR vavle looks stuck open to me. Usually the pintle will be below the mouting surface 1/4 inch or so, not flush or recessed like it is. Or is that just what I see in the pic?

I think it is just the style valve or make of it. I noticed that too when I compared it to the old one, the old one was hanging down further, but the actual valve mechanisms looked different from each other, I should have taken comparison pics.

 

[HotRodPC]

It's a *195. Of course today my mechanic told me today I should take it out and put in a *160.

You need to fire your mechanic cuz he don't know his ass. You don't run a 160 or a 180. You run a 195 so you can get the computer into closed loop mode at 187-192 degrees.

 

[Old77]

...I should have taken comparison pics.

What were you thinking?????

 

[89Suburban]

You need to fire your mechanic cuz he don't know his ass. You don't run a 160 or a 180. You run a 195 so you can get the computer into closed loop mode at 187-192 degrees.

Really?

 

[HotRodPC]

yes, the computer will run the motor rich all the time, and keep the timing retarded thinking the motor has not reached operatiing temp yet. Hurts performance and mpg.

 

[dhamp]

You need to fire your mechanic cuz he don't know his ass. You don't run a 160 or a 180. You run a 195 so you can get the computer into closed loop mode at 187-192 degrees.

Maybe he was thinking pre-TBI squares?? Just a thought........

 

[89Suburban]

Could be, I can see how it would affect the computer, but if I put HD heads on it it shouldn't be a problem to run the *195 t stat I would think.