demonpixel

iTrader: (19)

Went to OReillys, asked the guy for a 98 Z28 cts (my pcm is 98 and I have 853 heads), and this is what he gave me (oreillys pn WT3000):



Went to install it, and obviously it doesn't fit:



(Circumference is too big):


No, I don't have the original cts. Hate to sound dumb, but am I missing something here??

Thanks to anyone willing to help!

-Zig

edwardzracing

iTrader: (59)

Are those the stock heads? I thought 98's had perimeter valve covers only? Maybe I just can't see them well enough??

edwardzracing

iTrader: (59)

EDIT. I just used Oreilly's website... First using the 1998 Z28 as my vehicle, and it brought up the same part number you purchased. Using a 1999 Camaro instead of a 1998 brought up this part number:

WT5132

Maybe give that one a try, or at least take a peak at it and compare the two while you're at the store. I'm sure you'll be able to tell a difference in the thread sizes if the one is correct.

demonpixel

iTrader: (19)

Thanks edwardz. I could have sworn that the threads would be the same for a 98 and 99 cts!!

Anyone out there replace their cts on an 853 head with a cts from OReillys? lol

edwardzracing

iTrader: (59)

Glad to help. Your car happen to have Traction Control? If so, perhaps you can lend a hand in the thread I just posted.

https://ls1tech.com/forums/generatio...cs-cables.html

Anyways... I'm wondering if OReilly's has a bad part number listing for '98's. I have a '98 Z as well, and I put some trick flow heads on it, and I never had to replace my coolant sensor. My stock one worked fine... and I can promise you Trick Flow doesn't use '98 castings, LOL. I blame OReilly's. Good luck man.

slow

iTrader: (7)

the CTS are different between 98 and 99+ 98's are 3 wire, and 99+ are 2 wire, the thread is the same, OReilly's part search must be wrong, giving you the wrong part.

Ryan

demonpixel

iTrader: (19)

Did some research; thought I'd share the info. If anyone needs a cts for a 98 PCM, and the dealership is closed, you can go to Advance Auto and get PN WT5121:



As you can see, it has the three prongs, and this one threaded in perfectly:



The heads I have are 853.

XtraCajunSS

iTrader: (2)

The heads are not the issue. The sensor they gave you is the wrong part. The 97-98 LS1 cars use a 3 pin sensor. The 99-up cars use a 2 pin. They are physically identical as far as size and thread pattern.

Shane

12secSS

iTrader: (30)

To add to the info on this thread already, the first sensor is a standard thread pattern for SBC type engine (LT1, L98 TPI, etc ...). The LS1 uses an M10 metric thread, which is physically smaller then the older (IIRC) 1/4 NPT.