Exhaust Manifolds FWC

[makomike1]

I have 270hp crusaders FWC. My exhaust manifolds are atleast 15years old. How long do they last and when should they be replaced?
Thanks Mike

 

[bobct]

Mike,

When I was a young buck (4 years ago), I installed new exhaust manifolds on my 22 yo FWC 454's. If I had it to do over, I would have left them and just did risers/elbows. They seem to last the life of the engines with almost no failures aside from obvious neglect.

Bob

 

[makomark]

2X what Bob said!!

As long as you keep good coolant in the system, the exhaust manifolds will last a real long time.

The risers and elbows...depends upon what you boat in (water content) and how often...on the east coast, I'd say 4-7 years...even with fresh water flushings after each use...