PDA

View Full Version : 94 prostar 190 thermostat


tappskier
03-29-2012, 01:53 PM
I have a 94 prostar 190 with the LT1.. Im changing both of my thermostats,,,, switching the crossover tubes to the front of the heads and doing the heater mod... its been a few days since I took it apart and I cant remember which way the stats go back in, which side of the thermostat goes towards the block? Thanks

ricford
03-29-2012, 02:15 PM
I've never changed the lower one, but I know the upper one goes spring down towards the block.

tappskier
03-29-2012, 02:19 PM
Yes,, thats what I thought, pointed side up? Right? It would make sense the lower one would be the same???? Pointed side away from the motor?

ricford
03-29-2012, 02:22 PM
Yup, that's right. Did you buy the marine thermostats or are you using automotive. Auto will work, but you have to drill a hole in it.

tappskier
03-29-2012, 02:24 PM
I ordered both from skidom,, they are suposed to be here today

ricford
03-29-2012, 02:31 PM
So they should be correct. First time out with mine and the temp spiked 5 minutes in, then suddenly dropped. Later, when I had to change the circulating pump I found the PO had used an automotive thermostat with no bypass hole, so first time out after winterizing there was no water in the engine till the thermostat opened. Lucky I didn't cook it.

pram
03-29-2012, 02:31 PM
When you did your cross over tubes, did you have a hard time getting them to loosen?

I briefly looked at mine and they would not budge

Stx221
03-29-2012, 02:34 PM
Yup, that's right. Did you buy the marine thermostats or are you using automotive. Auto will work, but you have to drill a hole in it.

A quick look shows that the auto thermostats for a Corvette are either 180 or 195 degrees.
Not the 143 and 160 that the marine application specs for.

Just a heads up as I had looked two days ago to see the temp of the auto versions.

tappskier
03-29-2012, 02:35 PM
They were pretty tight, I had to use the double wrench trick to get them loose, but once cracked no problem... and it wasnt bad rebending it for the front,, just slow, a little heat and careful

ricford
03-29-2012, 02:37 PM
A quick look shows that the auto thermostats for a Corvette are either 180 or 195 degrees.
Not the 143 and 160 that the marine application specs for.

Just a heads up as I had looked two days ago to see the temp of the auto versions.

I don't know where the PO got it, but the temp was 160, but there was no bypass hole.