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LS engine height/fitment

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Old Jun 26, 2023 | 05:17 PM
  #1  
MarcA's Avatar
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LS engine height/fitment

Getting ready to do an LS swap and have an option for a different style intake. Does anyone know what the measurement or height under the hood is to be able to fit a different style intake? This is also driven by the fact that the composite intakes are back ordered and no estimation on arrival. If the metal intake pictured would fit it would super cool. Just curious if anyone has the measurements of the underhood space. This per the builder is 2.5" taller than a stock composite intake

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Old Jun 27, 2023 | 08:29 AM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Re: LS engine height/fitment

I've seen versions of those fit under the hood of third gens but there are many variations. If you are not running boost, I would find an OEM intake to run over that. Those intakes are suboptimal for N/A set-ups.
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Old Jul 6, 2023 | 05:07 AM
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From: Iowa
Car: 1986 IROC, 2017 Silverado
Engine: 7.0L, 6.2L
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Axle/Gears: 3:23, 3:55
Re: LS engine height/fitment

Originally Posted by ShiftyCapone
I've seen versions of those fit under the hood of third gens but there are many variations. If you are not running boost, I would find an OEM intake to run over that. Those intakes are suboptimal for N/A set-ups.
100% in agreement with shifty.
From watching Richard Holdner's comparisons with aftermarket intakes, GM nails it forNA applications. A stock LS3 manifolds will perform equivalent to most all.
Verbatim from Hot Rod or Richard, I can't remember, but I think it was said on Engine Masters, larger cubic inch motors is the only place where the fast lsx-r intake has better numbers and it wasn't that large of a gain to justify the 1300 intake once you buy fuel rails.
I lowered my motor 1.5", the amount of work and additional cost to replace parts, like the oil pan or that I had to move the wiper motor up 3/8 of an inch, were worth it to keep my "Wolf in Sheep's Clothing", appearance with the stock hood.
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Old Jul 6, 2023 | 09:06 AM
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Car: '89 Firebird
Engine: 7.0L
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Re: LS engine height/fitment

The engine ends up being sloped downward towards the back, so the highest point is going to be the top of the throttle body or possibly the intake pipe depending how you have it routed. Firebird is a lot shorter to hood in that area. And different K members and mounts will set the engine at different heights. It's not just the height that matters, but where that height is located front to back because you quickly get a lot more clearance under a Firebird hood as you move away from radiator.

​​​​​​I don't have a stock K member or I would take a measurement for you. Sometimes you just got to put stuff together and see what happens and be willing to sell parts that don't work and try again. I've done it many times.
​​​​​​

Last edited by QwkTrip; Jul 6, 2023 at 09:11 AM.
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