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LS3 exhaust manifold

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Old Jul 14, 2015 | 01:01 PM
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Default LS3 exhaust manifold

On an LS3 conversion can you use the stock LS3 exhaust manifolds? Or do you need headers for clearance?
Thanks
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Old Jul 14, 2015 | 01:29 PM
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From: los altos hills california
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Manual clutch linkage, Borgeson all fit fine. Slight interference with manifold shield and reverse lockout linkage bracket easily rectified with a little grinding.
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Old Jul 14, 2015 | 05:33 PM
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Default grinder

Awesome thanks...I have a good grinder
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Old Jul 14, 2015 | 06:45 PM
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I am using the C6 manifolds that are on a lot of LS3 crate engines - the short ones with O2 in the center. I use a batwing oil pan, Jeep steering box, and modern 6 speed. No shift or clutch linkage to worry about, and no problems for me. Many here use the C5 manifolds as well. Just be sure you don't have the GTO manifolds that come on some crate engines - they flare out too wide.
Your engine mount adapters do make a difference, because the engine location can be forward or back from "stock" depending on the mount you use.
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Old Jul 14, 2015 | 07:10 PM
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Sorry I forgot there are a couple of choices. The manifolds I'm talking about are 12603758 and 12603760.
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Old Jul 15, 2015 | 11:58 AM
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Perfect I will be sure to get the correct one.
You guys are fantastic
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Old Jul 15, 2015 | 12:05 PM
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Default Engine mount

"Your engine mount adapters do make a difference, because the engine location can be forward or back from "stock" depending on the mount you use."

Which engine mount adapters would be appropriate for an LS3 with a/c with borgeson steering and 4l60E transmission
Thanks again
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Old Jul 15, 2015 | 07:44 PM
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Originally Posted by navet
"Your engine mount adapters do make a difference, because the engine location can be forward or back from "stock" depending on the mount you use."

Which engine mount adapters would be appropriate for an LS3 with a/c with borgeson steering and 4l60E transmission
Thanks again
You would need to get some ideas from someone who used that auto. I am not sure how it would line up with your existing trans cross member.
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