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GIL sbc exhaust?

Old 06-23-2019, 08:54 AM
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Default GIL sbc exhaust?

Can anyone tell me about the old GIL sbc aluminum exhaust manifolds with stainless risers? Were they a decent design? I have a chance to pick up a new in the box set from a local guy. The risers are not a long tube design but appear to be a direct stock replacement.
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Old 06-24-2019, 05:55 PM
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Here's what the risers look like...

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Old 06-25-2019, 12:33 AM
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Gains will be very minimal if at all on a SBC.
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Old 06-25-2019, 09:01 AM
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I agree with Griff. Been there done that.
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Old 06-25-2019, 09:34 PM
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They have to be better than my stock log exhaust...


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Old 06-25-2019, 09:41 PM
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Nope. About 80lb's lighter though...all said and done.

What did they do to that poor riser ?

BTW: What are you attaching these too (ie: what motor), maybe we can help.
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Old 06-25-2019, 10:38 PM
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mine worked good but were dry to the tip
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Old 06-26-2019, 01:25 AM
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If you have the old log exhaust then I would switch to the Gils simply because of the age of yours.
If you had the Merc cast iron center rise exhaust, then I would leave them.
I still doubt you will gain anything performance wise.
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Old 06-26-2019, 09:53 AM
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These will be replacing the aging old stock log manifolds, that's the main reason for the swap. These GIL's will cost me less than a new Merc cast iron center rise setup. The engine was built from a Quicksilver reman long block for the previous owner. Quicksilver part#: 87971R5 Bore is listed as - 040 on the tag so I think that's a 358? Its all stock except for the Edelbrock Performer EPS intake (Part # 2701) and the Edelbrock Marine Series 600 cfm, Square-Flange, Electric Choke Carburetor, non-EGR (Part # 1409). I just have been enjoying it as is for the last few years since I picked it up.

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Old 06-26-2019, 10:15 AM
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FYI: The new wet joint Mercruiser center rise exhaust kit can be had for near/under $700, but they are cast wrong and can/probably will leak. The new replacement from merc won;t be out for a month. Hopefully those are cast right.
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