New exhaust elbows

[duckmnn]

So I got an updated set elbows that replace the old style on my 96 7.4 .Mercruiser tech gave me part number . Problem is my boat use 3 inch riser block between elbows and manifold . Plus old was fastened with studs . New one are about 6” bolts . But bolts need to be about 10” to use riser blocks ?? Any ideas ? Thanks

 

[scoflaw]

Order 10" bolts from Fastenal or Merc. 3/8" course thread

 

[rcknecht]

replace the manifold risers and elbows together.