Does anybody have any feed back on these for a SBC? Ill have about 375HP on this motor and curious if the GLM aluminum manifolds will be sufficient for this application... I already have some Stainless risers to match my stock manifolds just need a manifold upgrade and with being on a tight budget with a baby on the the way... Im sure some of you understand...

Thanks for any feedback!

I bought mine from Dennis Moore. Aluminum with the individual runners. I am using them with FastGlass/Imco 22" long stainless dry risers. Water mixes with the exhaust 1" into the exhaust tip.

Been using them with no problems since 09' on my 385ci SBC
475hp. I'm sure the better manifolds and headers would help more but for the poor mans budget, they work fine.
Boat runs high 70's low 80mph GPS
http://www.youtube.com/watch?v=ORkMT3JMWu8

As low as $1,995 per pair.
http://www.custommarine.com/headerap...topheaders.php

Well... the only reason im asking is that i have the stainless risers to match the GLM manifolds.... I am on the tight budget and really cant afford more then 600 for exhaust... Baby on the way...

You get a lot of bang for the buck...if you are strictly a fresh water boater. I'm not...so all things considered I went with CI Merc OEM...2: sets A~Z for my 400 HP 355's under $1K.

I asked several people in this area that told me that even with flushing and anode replacement don't expect more than 2: years use.

You still need to add the cost of the tailpipes if you choose this route,don't you? Not sure

I'm going to be picking up the GLM's from Dennis Moore. For the price and weight savings you just cant beat.

how come aluminum won't outlast the stock ones, I have always been told the opposite.

I tried ordering 2 sets from dennis moore last month and the said they won't have anymore until Jan

In salt water your dealing with an electrolyte that accelerates galvanic flow. This is where dissimilar metals...iron and aluminum cause a flow of electrons from the least noble (aluminum) to the most noble (iron) causing the aluminum to dissolve like an alka seltzer in a glass of water. Fresh water doesn't present this problem.

I noticed that the new style Mercruiser iron wasn't that much heavier and I was able to by manifolds, risers, bolts and gaskets for 2 engines for less than $1000...no brainer for me.