Does anyone know the part number for the OEM LS1 head bolts that hold the exhaust manifolds on? They are the 8mm x 1.25 x 32mm long bolts. Thanks in advance!

 

I keep finding GM part # 11515758 coming up as an exhaust manifold replacement bolt but is listed as a timing cover bolt too, that bolt is little longer 8x1.25x40 and the head is bigger. # 12551187 comes up in my parts manual as the correct part number for exhaust manifolds bolts 8x1.25x32 but not available anymore for some reason. Have you called a dealer?

 

# 12551187 is the number that i had as well but i too found out it was not available. it was suggested to me to use OEM LS1 head bolts on my GMC sierra in order to bolt up my pacesetter LTs. I was trying to find the part numbers so i could go ahead and order them. any other suggestions?