GLM brand exhaust manifolds

[Mischief Managed]

Anyone try these on a BB chevy? My OEM manifolds and risers are 6 years old and I figure they will need replacement soon. The maker of these claims they give more power and more even cooling. Wondering if anyone has had any experience.<br /><br />Cheers<br /><br />

 

[KaGee]

Re: GLM brand exhaust manifolds

Supposedly Dennis Moore had something to do with it and the design.<br /><br />You certainly have a hard time beating the price. I purchased a different set. They seemed to be OK to me.

 

[Reel Poor]

Re: GLM brand exhaust manifolds

Good manifolds and at a good price. I thought I read a week or so ago that GLM had come out with a new version of that manifold that also water cooled the lower part of the manifold where the exhaust runners are. Its supposed to help stop them from rusting away from heat and corrosion.

 

[Capt Ken]

Re: GLM brand exhaust manifolds

Been using them for about a year on customer's boats and haven't had a problem. Did find out last week they make them in alum for somewhere around $200 more per set. Comes in a kit with manifolds, risers gaskets and bolts.

 

[Mischief Managed]

Re: GLM brand exhaust manifolds

I saw the aluminum too. They are 80 lbs lighter than stock and that's more than half the difference between a small block and a big block, if memory serves. A weight savings like that is pretty impressive. Wondering how well they'd hold up corrosion wise though. Would seem to me that aluminum would act as a sacrificial anode for the iron block but perhaps I have my metal nobility differences confused and the block would be sacrificed for the manifolds. What's the intake made of on a 7.4 MPI?

 

[Mischief Managed]

Re: GLM brand exhaust manifolds

Dennis Moore eh? There's a song about him. Goes like this:<br /><br />Dennis Moore, Dennis Moore,<br />galloping through the sward,<br />Dennis Moore, Dennis Moore,<br />and his horse Concorde.<br />He steals from the rich,<br />he gives to the poor,<br />Mr Moore, Mr Moore, Mr Moore.<br /><br />Dennis Moore, Dennis Moore,<br />Riding through the night.<br />Soon every lupin in the land<br />Will be in his mighty hand<br />He steals them from the rich<br />And gives them to the poor<br />Mr Moore, Mr Moore, Mr Moore.<br /><br />Dennis Moore, Dennis Moore,<br />Dumdum alum the night.<br />Dennis Moore, Dennis Moore,<br />Dun de dun dum plight.<br />He steals dumdum dun<br />And dumdum dum dee<br />Dennis dun, Dennis dee, dum dum dum.<br /><br />Dennis Moore, Dennis Moore,<br />Riding through the woods.<br />Dennis Moore, Dennis Moore<br />With a bag of things.<br />He gives to the poor and he takes from the rich<br />Dennis Moore, Dennis Moore, Dennis Moore.<br /><br />and so on...

 

[Capt Ken]

Re: GLM brand exhaust manifolds

The alum manifolds have zincs that you are suppose to change out every six months. The warranty on the alum manifolds are one year vs three on the cast iron.

 

[Scaaty]

Re: GLM brand exhaust manifolds

My take is get the best ya can (no problem with GLM) if fresh water. Salt..?...get a deal off one on the trusted sellers on ebay...gonna rust out in 4 anyway......

 

[mikeneal]

Re: GLM brand exhaust manifolds

I installed aset of the FE ones about a year ago. I run 99% time in salt water and very happy with them.

 

[Mischief Managed]

Re: GLM brand exhaust manifolds

Cheers folks.

 

[Olds Eddie]

Re: GLM brand exhaust manifolds

Question for Mike Neal. Did you notice any difference in performance? I have closed cooling and IMCO stainless risers and am considering buying the aluminum GLM's for my SBC 400. I figure the weight savings alone will help the performance but Dennis claims they help by their design.

 

[Capt Ken]

Re: GLM brand exhaust manifolds

Sierra sent one of those 18 wheelers loaded with new stuff and invited the area mechanics down to the local Hooters for beer and wings last week. So I told the son to go represent the shop and find out what was new. After I sobered him up the next day, he said Sierra was gonna have their version of the alum manifold out this spring but was going to ceramic coat the water passages. Maybe one day soon he'll remember what else he witnessed.

 

[mikeneal]

Re: GLM brand exhaust manifolds

I noticed a very slight increase, I did them at same time as full tune up though so not the best test of the manifolds and risers only. From the cut away views they must flow better. Don't expect a 10 mph increase though.