FAST – LSXHR 103mm Intake Manifold for LS3 Rectangular Port (146106)
$1,349.95
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The FAST LSXHR intake manifolds are available for LS3 rectangular port applications, as well as LS7 raised rectangular port applications. These units are the industry’s first polymer tunnel ram-style intake manifolds—and are ideal for generating maximum power in boosted and naturally aspirated engines. Order the model designed for your application.
- Comes standard with tall runners, short and medium runners available separately.
Ships directly from supplier
This item ships directly from the manufacturer. If your order is urgent, please reach out to determine the specific lead time.
Description
The LSXHR™ 103mm Intake Manifold for LS3 Rectangular Port Applications features:
- Standard “tall” stacks are interchangeable with separately purchased “medium” and “short” stacks to find the most powerful combination
- Polymer construction is lightweight and high strength to eliminate power-robbing heat soak commonly found in aluminum intake manifolds
- Average 30 HP gain between 5,000 and 7,500 RPM over competitors’ high ram intake manifolds
- Rated for up to 45psi of continuous pressure
- Compound fuel injector angle aims spray pattern for ideal atomization, resulting in maximum power production and superior drivability
- Reversible top allows for forward- or firewall-facing throttle body installations
- Two nitrous nozzle bosses per runner for clean and easy direct port system installations
- 103mm Throttle body opening can be ported to 105mm
Questions & Answers (19)
Customer questions & answers
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Does the intake manifold come with new fuel rails or will the factory fuel rails work with it.
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Q Does the intake manifold come with new fuel rails or will the factory fuel rails work with it. answer nowAsked by on May 8, 2026 6:51 amA Factory fuel rails aren't going to work with it. Fast's site doesn't list whether this particular one comes with rails, but I looked at a LS7 version that we have on the shelf and the fuel rails were included with it. So I would be inclined to believe they provide the rails with the manifold! Thanks,
I'm currently running your SS2 cam with ported rod mod intake in my ls3 with 11:1 compression. Would this intake manifold be a good upgrade for me? Its going to get 10l80 swapped as soon as kits are available. Already have the trans.
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Q I'm currently running your SS2 cam with ported rod mod intake in my ls3 with 11:1 compression. Wo...... Read more answer nowAsked by on February 13, 2026 4:04 amA Not really you'd be better with the standard fast manifold instead but the port rod is fine really with that cam https://gwatneyperformance.com/fast-lsxr-intake-manifold-102mm-intake-manifold-for-ls3-l99-l92-l76-146102b/
Would this fit a 2002 Chevy Silverado 1500
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A No this is for ls3 rectangle port heads you'd need one for cathedral port heads we don't have it listed on our site but can order it
Would this clear the good of a 24 Camaro Ss
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A This is for a Gen 5 application, will not fit on your Gen 6.
I have a 2012 Sierra with a 6.0 w/832 heads. Will this work??
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Q I have a 2012 Sierra with a 6.0 w/832 heads. Will this work?? answer nowAsked by on October 25, 2023 5:57 pmA That manifold will bolt to those heads yes, but depending on your application may not be best suited for your needs.
is there any room for this manifold to receive any porting ?
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Q is there any room for this manifold to receive any porting ? answer nowAsked by on June 13, 2022 5:14 pmA No sir
I have a 2010 camaro ss what all does it come with and what modifications would I have to do to install it?
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Q I have a 2010 camaro ss what all does it come with and what modifications would I have to do to i...... Read more answer nowAsked by on December 19, 2021 2:14 pmA Not sure what you would have to do to install we've never installed one and I'm sure it comes with everything in the picture but you may reach out to edelbrock and verify firstA you need to remove your wiper assembly in order for it to clear the manifold other, then that it fits like a glove.
Hi i need to know the height of the LSXHR 103 intake manifold, from the endgine vallypan.
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Q Hi i need to know the height of the LSXHR 103 intake manifold, from the endgine vallypan. answer nowAsked by on October 25, 2021 5:29 amA Believe they have the dimensions on edelbrocks site
Will this fit on a 2016 Chevy Silverado 5.3
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A No it will not, this is designed for ls3 heads and this high of a manifold I'm not sure would clear the wiper cowl
You don't seem to carry the Fast Lsxhr for Cathedrals? What would be price on it?
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Q You don't seem to carry the Fast Lsxhr for Cathedrals? What would be price on it? answer nowAsked by on June 4, 2021 2:34 pmA It would run $982.95
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Very nice Intake good quality!