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exhaust manifold choices

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buick430

Regular Contributor
Hey guys I am coming op on replacing my exhaust manifolds and risers in the next couple months before they fail and I need new engines as well. I am faced wit a couple options as the engine compartment in my 1973 32' luhrs has plenty of room. To replace what I have now on both engines will cost around $2,400 maybe a little more with new studs. I am contemplating the center rise style just to get rid of the extra gasket.

I am also considering HI TEK stainless manifolds. I really dont like the idea of spending twice the amount of money on these, but they do have there advantages and I plan on keeping this boat for a long time. I figure in ten years these will have paid for themselves. I also like the idea of a manifold that will outlast the engines. Not to mention the fact they weigh 25% of the OE manifolds. I havent seen any recent posts of anyone running these on a chrysler and was wondering if any of you have gone this route.

Any input is appreciated
Keep in mind, performance gains are not of any concern, just reliability and longevity.

will
 
I have one of those tubes I bought and will never use ,check your PM's
Stainless manifolds aren't worth it especially if you run in freshwater,you could get 7-8 years in fresh,osco has a 3 year warranty in the salt
 
I Think im just gonna go with the standard cast iron manifolds. I wonder if installing some pencil zincs in the manifolds would help a little?

will
 
Hey Will – I think you’re leaning in the right directiongoing with standard/cast manifolds. Since you’ve stated that performance gainsare not the goal, you shouldn’t give a second thought to the cost of theHiTeks. If you checked out akjon’s link to John Hamilton’s project, you’ll seethat there were a lot of other modifications that warranted a freer-flowingexhaust. In other words, even if you were, in fact, looking for some performancegains, you probably wouldn’t notice the difference without other/complementary performancemodifications (heads, intake, etc.).
 
Yea I really liked the idea of having stainless just because I run in very salty water (pacific ocean) and the boat is stored in the water. But twice the cost is a lot. Im hoping i can get 5-6 years out of the replacements. And going faster while nice, is not my goal in this boat.

will
 
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