Porting stock intake
Thread Starter
Instructor
Joined: Apr 2014
Posts: 132
Likes: 15
From: TN
Porting stock intake
I'm thinking of having my stock lt1 intake manifold ported. The question that I have is, will opening up the snout (flange where the throttle body mounts) for a 95mm throttle body weaken it too much for boost? I currently run a solar ported throttle body. I'm at 9.3lbs of boost with a p1x. Thanks in advance!
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
I'm thinking of having my stock lt1 intake manifold ported. The question that I have is, will opening up the snout (flange where the throttle body mounts) for a 95mm throttle body weaken it too much for boost? I currently run a solar ported throttle body. I'm at 9.3lbs of boost with a p1x. Thanks in advance!
Dave
Drifting
Joined: Mar 2022
Posts: 1,388
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From: Indiana
I also bought an EdgyVette ported intake. ~$350. Money very well spent.
Measured it against the stock intake and saw around .030-.040 difference at the inlet. Dyno'd back to back I saw ~15hp increase in the midrange and maybe 2hp up top. More than anything, it increased my redline by 750/800RPM. I am also running an A&A supercharger.
I have 600rwhp/545tq with an M7
Measured it against the stock intake and saw around .030-.040 difference at the inlet. Dyno'd back to back I saw ~15hp increase in the midrange and maybe 2hp up top. More than anything, it increased my redline by 750/800RPM. I am also running an A&A supercharger.
I have 600rwhp/545tq with an M7
Thread Starter
Instructor
Joined: Apr 2014
Posts: 132
Likes: 15
From: TN
Ported Intake
Well, just got my stock intake back from GPI and re-installed. Temperature is not the same as last fall, but now I'm at 7.2 lbs of boost. I was looking to lower boost, has anyone had simular results? I didn't record atmospheric pressure, temp, blah, blah, just looking to see if stock lt1 intake porting usually results in 1.5 ro 2 lbs of boost loss - generally. Thanks!
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
Well, just got my stock intake back from GPI and re-installed. Temperature is not the same as last fall, but now I'm at 7.2 lbs of boost. I was looking to lower boost, has anyone had similar results? I didn't record atmospheric pressure, temp, blah, blah, just looking to see if stock lt1 intake porting usually results in 1.5 ro 2 lbs of boost loss - generally. Thanks!
Make sure you check your belt as they stretch ....
After really tightening my belt as I was battling some belt slip and was only getting 5 to 5.5 pounds of boost, as you know I have a ported intake, ported throttle body, 1 7/8 headers into high flow cats and a 3-inch mid-pipe and a stock 4.5-inch Procharger pully below are my numbers
It was 75 degrees and sunny today here in ATL low DA, perfect boost weather .... I may or may not have made a run today on the "Streets of Mexico" my boost gauge records max boost which today it was 7.2 Pounds .. I was on my brand-new Michelin PS4's street tires not my drag radials and had TC on and even putting some heat into them it still was a bit of a pedal fest as it was fighting for traction all the way thru the top of 2nd gear 
I am really fighting the urge to pully down .....
Can't wait for Atlanta Dragway to open this year, even if its 1/8-mile IHRA ....
Dave
Last edited by Dcasole; Mar 22, 2026 at 07:18 PM.
Thread Starter
Instructor
Joined: Apr 2014
Posts: 132
Likes: 15
From: TN
Boost is a byproduct of restriction, reduce restriction reduces boost but increases power (in most cases) ....
Make sure you check your belt as they stretch ....
After really tightening my belt as I was battling some belt slip and was only getting 5 to 5.5 pounds of boost, as you know I have a ported intake, ported throttle body, 1 7/8 headers into high flow cats and a 3-inch mid-pipe and a stock 4.5-inch Procharger pully below are my numbers
It was 75 degrees and sunny today here in ATL low DA, perfect boost weather .... I may or may not have made a run today on the "Streets of Mexico" my boost gauge records max boost which today it was 7.2 Pounds .. I was on my brand-new Michelin PS4's street tires not my drag radials and had TC on and even putting some heat into them it still was a bit of a pedal fest as it was fighting for traction all the way thru the top of 2nd gear 
I am really fighting the urge to pully down .....
Can't wait for Atlanta Dragway to open this year, even if its 1/8-mile IHRA ....
Dave
Make sure you check your belt as they stretch ....
After really tightening my belt as I was battling some belt slip and was only getting 5 to 5.5 pounds of boost, as you know I have a ported intake, ported throttle body, 1 7/8 headers into high flow cats and a 3-inch mid-pipe and a stock 4.5-inch Procharger pully below are my numbers
It was 75 degrees and sunny today here in ATL low DA, perfect boost weather .... I may or may not have made a run today on the "Streets of Mexico" my boost gauge records max boost which today it was 7.2 Pounds .. I was on my brand-new Michelin PS4's street tires not my drag radials and had TC on and even putting some heat into them it still was a bit of a pedal fest as it was fighting for traction all the way thru the top of 2nd gear 
I am really fighting the urge to pully down .....
Can't wait for Atlanta Dragway to open this year, even if its 1/8-mile IHRA ....
Dave
Drifting
Joined: Aug 2017
Posts: 1,898
Likes: 354
From: Dayton, OH
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Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
Dave