PICS $100 -Series I exhaust manis ported and ceramic coated! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 03-03-2006, 09:08 PM   #21
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Quote:
Originally Posted by ukie eagle
Question Guys: how much would my L27 benefit from a set of these?...would I notice a significant gain in power simply by installing a set of these [enough to justify the hassle], or would I have to do other mods as well to see any real gain?...I keep watching this topic & keep thinking that the price is right, but would I be better off concentrating my efforts elsewhere? ...Besides, I thought my stock downpipe was a bigger restriction :(
if you do the PEM'* you can also change the DP at the same time
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Old 03-04-2006, 04:21 PM   #22
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Got my ceramic coated and PEM'*. These things are gonna rock!!!!
My only concern is that he coated the surface that is supposed to be smooth to seal up to the heads. Another minor one is that he coated the inside of the mani'* too. Is that gonna help -I'm thinking restriction since it'* kinda rough -not real rough, but a few bumps here and there.
Pics will be up by tonight -have to get to Gordy'* now.
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Old 03-04-2006, 05:02 PM   #23
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Quote:
Originally Posted by OLBlueEyesBonne
Got my ceramic coated and PEM'*. These things are gonna rock!!!!
My only concern is that he coated the surface that is supposed to be smooth to seal up to the heads. Another minor one is that he coated the inside of the mani'* too. Is that gonna help -I'm thinking restriction since it'* kinda rough -not real rough, but a few bumps here and there.
Pics will be up by tonight -have to get to Gordy'* now.
The ceramic coating on the inside should actually help keep the heat from the exhaust gas inside the manifolds, it'* a good thing. Many headers are coated inside and out for that reason.
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Old 03-05-2006, 09:51 PM   #24
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Old 03-05-2006, 10:01 PM   #25
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Those look sweet
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Old 03-05-2006, 10:04 PM   #26
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I'm concerned with the finish quality on the port inlets. And I have NFC what the coating on the mating surface of the flanges will do.
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Old 03-05-2006, 10:07 PM   #27
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Nothing a little sand paper couldn't take care of...
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Old 03-05-2006, 10:22 PM   #28
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Quote:
Originally Posted by J Wikoff
Nothing a little sand paper couldn't take care of...
Yeah, my concern is getting a good smooth finish without chipping the edges so the ceramic doesn't chip off.
I personally think they could use another coat or two -so I'm picking up a can of VHT ceramic header coating and will put a second coat on, bake in oven, put third coat on and bake in oven again.
After that I'm going to take them into the local machine shop and see if they can clean the mating surface down to like it should be, but without taking hardly any metal though.
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Old 03-06-2006, 12:53 AM   #29
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Marty, don't use the VHT. You'll cook it off. I did.

Get a large stone for sharpening a knife and use it to flatten the surface. No need to be perfect, but look for warping. You'll see it as you go.

Use gaskets during reassembly.

(some of you may not know the Series 1 L67 had no EM gaskets from the factory).
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Old 03-06-2006, 08:35 AM   #30
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I don't think the S2 has gaskets either...am going to find out though.

Marty.. Looking better than stock.. let us know when you get that hooked up.
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