Mercruiser exhaust manifold bolts

[jonny rotten]

98 5.0 Will 5 inch bolts work on the exhaust manifold? OEM is 4 3/4. Will the extra 1/4 inch bottom out before tightening up. Thinking not and it will work. 4 1/2 doesn't leave much meat comparing to wear marks on old bolts

 

[alldodge]

Think it might be to long
To check screw the bolt all in without manifold and measure distance. Do this on every hole to see if it will tighten up before bottoming out

 

[crazy charlie]

If you are stuck on using the questionable bolts you may want to consider using extra washers to make up part of the space.Charlie

 

[ESGWheel]

One thing to consider is to run a thread chaser (not tap) down each hole. Use WD40 when using it followed by a cleaner like Brake Clean (or compressed air) to clean out any debris. This is the best way to ensure you are getting the proper torque on the bolts especially if the new ones are longer then the old ones