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LS1 Intake on a 98 C5

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Old Yesterday | 01:52 PM
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Default LS1 Intake on a 98 C5

All, I need some help / guidance to understand what I'm looking at. I'm looking to purchase an LS1 intake for an LS Swap I'm doing. I was not expecting to see a fuel pressure regulator or an EGR port behind the throttle body.
I thought if the car had a fuel pressure regulator on the fuel rail then it was a return system...... so I should expect to see 2 fuel lines, one to the intake and a return back to the tank.... only see one line, is the return hiding in the photo or did they make an LS1 intake with regulator on the rail but no return fuel line?
Also, I didn't think any C5's had EGR valves, although this was pulled from a 1998 C5, is it an F body intake?
Any reason I can't block the EGR valve, remove and block the fuel pressure regulator, block the return line

(if there is one) and run it?
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Old Yesterday | 02:36 PM
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From: Dyer, IN
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Originally Posted by uhlabomber
All, I need some help / guidance to understand what I'm looking at. I'm looking to purchase an LS1 intake for an LS Swap I'm doing. I was not expecting to see a fuel pressure regulator or an EGR port behind the throttle body.
I thought if the car had a fuel pressure regulator on the fuel rail then it was a return system...... so I should expect to see 2 fuel lines, one to the intake and a return back to the tank.... only see one line, is the return hiding in the photo or did they make an LS1 intake with regulator on the rail but no return fuel line?
Also, I didn't think any C5's had EGR valves, although this was pulled from a 1998 C5, is it an F body intake?
Any reason I can't block the EGR valve, remove and block the fuel pressure regulator, block the return line

(if there is one) and run it?
That is an F-body intake manifold, and that is NOT a fuel pressure regulator, it is a fuel pulse dampener.....and no, there was no EGR on a C5.
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Old Yesterday | 02:39 PM
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From: Dyer, IN
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This is what a 97-98 C5 intake looks like.....



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Old Yesterday | 02:59 PM
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Performance-wise, you're better off with a LS6 intake, or a 2001+ LS1 intake as they flow much better.
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Old Yesterday | 03:00 PM
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In the early days, F-Bodies had EGR valves and Vette's did not. So probably an F-Body intake

Honestly - it's kind of a crap intake manifold. You're better off with almost any other Truck, LS2, or LS6 unit.
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Old Yesterday | 03:06 PM
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Originally Posted by Ltngdrvr
Performance-wise, you're better off with a LS6 intake, or a 2001+ LS1 intake as they flow much better.
All 2001+ LS6 and LS1 intakes are the same.
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Old Yesterday | 03:13 PM
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From: Dyer, IN
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Originally Posted by Lowend

Honestly - it's kind of a crap intake manifold.
If you are speaking about a C5 LS1 intake, that's just not true, and it needs to be weighted against the OP's HP goals for the swap. Many folks are more than happy to transplant an stock LS1 into a restorod.
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Old Yesterday | 04:18 PM
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Thank you for the education. The good news is, if I go with the F body intake, then I don't need to block off or plug the fuel dampener, it can remain. Also, don't have a return fuel line to worry about..... just block off the EGR valve and go on with life.
I agree with all, a 2001+ LS1 intake is best case scenario for my needs but nobody seems to be offering those up for a reasonable price.
And... just so we are all aware, I'm doing an LS swap in my C3, using a Vortec truck engine but the LM7 intake is too tall to fit under the hood. It's a completely stock motor, no real performance upgrades planned.

Last edited by uhlabomber; Yesterday at 04:34 PM.
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Old Yesterday | 04:22 PM
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From: Dyer, IN
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Originally Posted by uhlabomber
Thank you for the education. The good news is, if I go with the F body intake, then I don't need to block off or plug the fuel dampener, it can remain. Also, don't have a return fuel line to worry about..... just block off the EGR valve and go on with life.
I agree with all, a 2001 LS 1 intake is best case scenario for my needs but nobody seems to be offering those up for a reasonable price.
And... just so we are all aware, I'm doing an LS swap in my C3, using a Vortec truck engine but the LM7 intake is too tall to fit under the hood. It's a completely stock motor, no real performance upgrades planned.
Then pass on the F-body intake and look for a C5 intake.
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Old Yesterday | 04:49 PM
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C5 intake will still have a pulse damper
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Old Yesterday | 05:29 PM
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From: Dyer, IN
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Originally Posted by arthursc2
C5 intake will still have a pulse damper
Provided the intake comes with the fuel rail and is from a 99-20004.
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Old Today | 10:23 AM
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The LS1 intake isn't bad I guess, but almost any other LS Cath-port manifold is an upgrade. Low hanging fruit.
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Old Today | 10:39 AM
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Originally Posted by Ltngdrvr
Performance-wise, you're better off with a LS6 intake, or a 2001+ LS1 intake as they flow much better.
2001+ LS1 intake IS an LS6 intake. AFAIK all 2001 and later C5s ALL had the LS6 intake.
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Old Today | 10:41 AM
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Originally Posted by Lowend
In the early days, F-Bodies had EGR valves and Vette's did not. So probably an F-Body intake

Honestly - it's kind of a crap intake manifold. You're better off with almost any other Truck, LS2, or LS6 unit.
IIRC, Tony Mamo once stated in the mid 2000's that the LS2 intake has been proven to be one of the worst flowing LS Corvette intakes out there.

Last edited by grinder11; Today at 10:47 AM.
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Old Today | 12:30 PM
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From: Dyer, IN
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Originally Posted by grinder11
2001+ LS1 intake IS an LS6 intake. AFAIK all 2001 and later C5s ALL had the LS6 intake.
It's really not an LS6 intake if all are the same, right?

I guess post #6 wasn't clear.
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