Vette manifolds as good as LT's????
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From: Albuquerque,NM
Vette manifolds as good as LT's???? has any one else seen this car craft is claiming that the vette cast manifolds are just as good as LT in variouse primary sizes. what do you guys think?
see link
http://www.carcraft.com/techarticles...est/index.html
see link
http://www.carcraft.com/techarticles...est/index.html
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From: Philly
By that logic, Corvettes wouldn't gain any horsepower with longtubes. However, they gain 20-30rwhp just like F-body's. Those headers they use in that article are built like complete crap, and I'd be willing to say that article is complete crap. Even if Corvette manifolds flowed the same as longtube headers, it wouldn't matter because most of the gains in longtubes are by increasing scavenging, NOT by increasing flow. Corvette manifolds can't physically scavenge like a longtube header.
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.....thats why its so hard to believe 
On The Tree
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From the pictures they didn't test a set of C6 Z06 manifolds. They are better than the regular Vette manifolds. They are not as good as a good set of long tubes, but are surprisingly good for OEM. We installed a set of LG pros (1 3/4" primaries) on an 07 Z06 and only gained 2 rwhp at peak, and 14 ft lbs in the mid range compared to the stock manifolds. We installed a set of American Racing headers on another Z (mine) and only gained 4 peak rwhp and 12 ft lbs in the mid range. If you can pick up a set of Z manifolds and 3" midpipes cheap, do it, you'll be surprised how well they work.
I don't know about the C6Z manifolds but the C5Zs definitely pick up decent power with LT's. Most results I see are around 20RWHP. I'm surprised to see that C6Z manifolds are that good.
From the pictures they didn't test a set of C6 Z06 manifolds. They are better than the regular Vette manifolds. They are not as good as a good set of long tubes, but are surprisingly good for OEM. We installed a set of LG pros (1 3/4" primaries) on an 07 Z06 and only gained 2 rwhp at peak, and 14 ft lbs in the mid range compared to the stock manifolds. We installed a set of American Racing headers on another Z (mine) and only gained 4 peak rwhp and 12 ft lbs in the mid range. If you can pick up a set of Z manifolds and 3" midpipes cheap, do it, you'll be surprised how well they work.
Actually, I just looked closely at the pictures. The way they assembled the exhaust with the vette manifold make the first change in cross-section about 30 inches from where the "collector" starts, so the engine would react like that is the end of the header secondary. In that case, that header is probably very close in its ability to scavenge as the long tubes, despite not having a good collector design. If you look at the f-body manifold, they bent the pipe right off the end of the flange, so you wouldn't see this result. I think if they bent the pipe in a way that would appear on an actual car, this would be a different result.
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From the pictures they didn't test a set of C6 Z06 manifolds. They are better than the regular Vette manifolds. They are not as good as a good set of long tubes, but are surprisingly good for OEM. We installed a set of LG pros (1 3/4" primaries) on an 07 Z06 and only gained 2 rwhp at peak, and 14 ft lbs in the mid range compared to the stock manifolds. We installed a set of American Racing headers on another Z (mine) and only gained 4 peak rwhp and 12 ft lbs in the mid range. If you can pick up a set of Z manifolds and 3" midpipes cheap, do it, you'll be surprised how well they work.
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Besides, what possible motive could Car Craft have in giving bogus numbers from tests run on Ken Duttweiler's dyno, when they derive a lot of their ad income from header manufacturer's. THINK ABOUT IT!---------------- so what are you saying with this comment, car craft is printing lies.
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Besides, what possible motive could Car Craft have in giving bogus numbers from tests run on Ken Duttweiler's dyno, when they derive a lot of their ad income from header manufacturer's. THINK ABOUT IT!---------------- so what are you saying with this comment, car craft is printing lies.
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From: Albuquerque,NM
well ill be the guinne pig if anybody has a set of c6 zo6 manifolds theyd want to sell for cheap ill try them on my ss and see what results i get if anybody has some pm me!
will they even work didnt think about the "D" shaped port
will they even work didnt think about the "D" shaped port
Last edited by SS02G; Jan 20, 2009 at 05:49 PM.
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I don't have a set of the Z06's because I used them on my street rod, only because they cleared some obstacles better than the others. I do have a set of the ones shown in the original article in Car Craft, in Jan. '05. They are in the "for sale" section for $100.00 shipped. I'll post a pic here, but if you want to see what the Z06 and the GTO or 'vette or whatever they are that were used in the dyno tests all look like, go to this thread by *clm69z28 *. It's titled * Exhaust Manifolds Options - LS1/68-72 A Body. There are some good pics of the Z06's and also complete pics of the type used in the dyno tests in one of my posts in that thread. As far as the "d" shaped port, I have L92 heads, which have the "d" port. and I used factory type gaskets. These fit both the heads and the manifolds really well. I first intended to just sandblast them and hi-temp paint 'em and run 'em that way, but my coupe has such a confined engine compartment, with AC lines and wires and brake lines so close, I put the heat shields back on, and I love 'em. I can run it and they make so much difference in the heat emitted, it's unbelievable! You can shut it down and in just a short timeyou can actually touch the shields. They are not that conspicuous either in my case since my coupe has side panels that kind of hide them. Have no idea if either set would work in your car, but they will fit in a lot of swap situations. Don't leak like headers do either. Check 'em out! Ron