exhaust manifold bolt sizes?

[NC87GN]

Does anyone have the proper bolt sizes for the exhaust manifolds? Looking for the different lengths as well (top and bottom). Thanks in advance..

Mike Banas
87GN

 

[MistaScott]

BOLT 3/8" -- 16X25.5
Part Number 25518186


STUD, HEX (M8 X 1.25 X 20/ 3/8" - 16 X 47.5 LW)
Part Number 25518176\


From the service manual if that helps...

 

[Forcedfed]

MISTASCOTT: Are these bolts still available from GM?

 

[MistaScott]

According to partszoneonline.com, only the long bolts are available. I screwed up the order in my earlier post; the part numbers go to the opposite bolts. 8186 is still available.

 

[MistaScott]

The short bolts are available too. I had the wrong part number

25526575 is the right one. Sorry bout that.

 

[Forcedfed]

Thanks Scott. I'm sending my original headers out to be coated soon, it would look a lot nicer with new original bolts when I put them back on.