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Replace manifolds or just risers and elbows

R

rmm

Regular Contributor
"New to me boat with 454s with

"New to me boat with 454s with 1000 hrs. Planning on replacing risrers and elbows which have a little bit of rust and joints but no active or visible leaks, dates on them are '96. Should I also rpleace the manifolds, dates on them are 87-88, so are original, no leaks but minor rust on undersides above plugs.

What is the best course of action here? Will have problems with removing the studs on the manifolds? Better to just leave them unless they leak?

Thanks

Ryan"
 
"Seeing you have 454s, definit

"Seeing you have 454s, definitely replace the manifolds. Those engines are famous for sucking water in through the exhaust ports.

Jeff"
 
"I am curious why you are repl

"I am curious why you are replacing the risers and elbows?

I have a 1970 260 hp Crusader (GM 350 CI) with original manifolds with about 1750 hours in fresh water. Still working after all these years.

I also have a 454 Crusader (1988) with about 700 hours.

What is the history of sucking in water through exhaust ports? Is this from rust, overheating, or normal wear and tear? I would like to hear more.

Thanks in advance."
 
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