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IMCO manifolds for LS

Old 01-23-2023, 11:08 PM
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Default IMCO manifolds for LS

Does anyone possibly have the flange riser measurements for the imco risers to manifold on a LS engine. They look fairly close to the ones I have for my bbc, could be wrong. Getting rid of all my big block stuff and going with a LS.
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Old 01-24-2023, 07:24 AM
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Appears the LS Powerflow system uses the riser gaskets on the Thumper series of bbc exhaust systems.
Appear both use Imco gaskets 11-1007
See individual parts of bbc system here:
https://imcomarine.com/cal_store/thu...kit-black.html

snd then:



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Old 01-25-2023, 06:01 PM
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Originally Posted by SB View Post
Appears the LS Powerflow system uses the riser gaskets on the Thumper series of bbc exhaust systems.
Appear both use Imco gaskets 11-1007
See individual parts of bbc system here:
https://imcomarine.com/cal_store/thu...kit-black.html

snd then:

Thank you! I didn't think of looking it up that way. Those are different then my power flow gaskets. Was trying to use my risers i have now and just get new manifolds for the LS but looks like I'll be having to buy manifolds and risers for the LS.
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Old 01-25-2023, 06:05 PM
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29 bucks for a 2 dolla gasket
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Old 01-25-2023, 06:43 PM
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Originally Posted by F-2 Speedy View Post
29 bucks for a 2 dolla gasket
Sounds like a Mercruiser move.

Speaking of money and exhaust - i have seen others mention the low cost of ls exhaust systems from crusader marine but nothing if fitment to existing tailpipes, performance, etc, etc ..
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Old Today, 03:57 AM
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Nice move I did this. I bought Hardin marine exhausts. I had to custom mill my own 6” risers out of billet aluminum.

post a link to yours. I’ve been consumed by weight reduction everywhere I can aluminum exhausts, plastic intake. But in retrospect would’ve been easier to go with crusader exhausts. Of course vp is doing Ls based now too.ever need to talk hit me up.

my engine is broken in on the stand but my b3 outdrive isn’t finished. I hope to do 60 top speed. We’ll see

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