Hey all, i got my 383 stroker back from the engine shop today. I have a quick question about my heads, they are stock lt1 castings which are ported. On the driver side head toward the front on the exhaust port side there is a roughly 1/2" or so threaded hole that leads to the water jacket. I know this is for the coolant temp sensor. BUT on the rear of the passenger side head there is the same hole, same side, threaded into the water jacket also. I assume this is done to make the left and right heads interchangable? What should I use to plug the hole on the passenger side head since its not going to be used for a sensor. ALSO, on the front and rear of the heads there is 1 water jacket on each head on each side, this i assume is also to make them interchangable, does anyone know the part number to those plugs so that i can cap the water jacket holes in the front of the head since the lines will be in the back? THanks alot!

 

No one knows?

 

um, use you old ones.........

 

I want to new ones since the heads i bought did not have them in one spot and was the wrong one in another.....Is this a dealer item? Or can I goto home depot and get a pipe fitting or something....?

 

Call Jason Cromer - 877.726.8295

 

Craig u dork :-P

 

i'll remember that..

 

So I found the P/N for the small plugs that go in the front of the heads they are 1/4-18 pipe fitting. GM PN: 144011 But i still cant find what is used to plug that threaded coolant temp sensor type hole on the passenger exhaust side of the head, toward the rear.

 

the one in the side should be 3/8 pipe thread(3/8NPT)

 

Measure the threads on the coolant temp sensor that fits in the hole

 

The small ones on the front are 1/4 NPT and the one on the side is 3/8 NPT with pn 14090911. Both can be found at hardware stores.