I'm trying to find a p/n or at least the size of the pipe plug for the front of the heads (equivalent to steam pipe bolts in back). Searched all over the forums and Shoebox's tech page and still came up short.

Thanks for any help you can provide.

 

¼-18 pipe thread.

GM PART # 144011 (yeah, it's a short p/n)

 

Thanks a lot