Max power from stock ls6 manifold?
Le Mans Master
Joined: Feb 2021
Posts: 6,536
Likes: 4,376
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Thread Starter
Advanced
Joined: Mar 2023
Posts: 56
Likes: 18
Reviving this to ask for y’all’s opinion on driving/towing to tune after install. I have my 233/239 cam in and have a tune schedule Thursday. I could rent a uhaul and tow it or would it be a terrible idea to very gingerly drive to the shop? All highway miles probably about 20 to get there.
Le Mans Master
Joined: Feb 2021
Posts: 6,536
Likes: 4,376
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Well, as long as it will keep running. Have you been driving around the neighborhood?
Thread Starter
Advanced
Joined: Mar 2023
Posts: 56
Likes: 18
Well I actually broke an intake manifold bolt off in the head so I’m putting it back together today lol. Had to take the head to a machine shop because after the bolt I broke a hardened extractor off in an attempt to get it. Absolute nightmare all around. Shop says it took them almost 3 hours to clear the hole.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,145
From: Sleepy Hollow- NJ
if the car stays running and it stays that way during a quick drive around the block you should be fine on a 20 mile drive. Just don’t do any WOT pulls and you shouldn’t have a problems if you built the car right.I drove my first heads/cam build from Marina Del Ray to Santa Barbara to have A&A do my tune. 96 miles no problem. I drove my second complete rebuild with forged internals/heads/cam/longtubes from Wantage NJ to Perkasie PA to have 2nd Street Speed do my tune. 83 miles no problem.
Don’t get tempted by the long pedal along the way and you’ll be fine. Once you get that head bolt sorted out and put her back together that is. Good luck!
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,145
From: Sleepy Hollow- NJ
PS…I was 428rwhp and 394rwtq on an LS1 with ported and milled 241 heads, 232/236/113+2 cam, Kooks 1 7/8s, under a ported OEM TB and LS6 manifold. The car now makes 640/568 at the wheels with a Novi 1500 on 93 pump with that same manifold and TB. It could make a lot more but under 700rwhp/600rwtq is a sweet spot for me these days . Not interested in breaking anymore stuff in my driveline at the moment.
If your goal is to get everything possible out of your NA build then the manifold and TB upgrade may be worth it. If you ever plan to go FI don’t waste the money on the intake. The LS6 will work just fine under boost for a few hundred more hp at the wheels.
If your goal is to get everything possible out of your NA build then the manifold and TB upgrade may be worth it. If you ever plan to go FI don’t waste the money on the intake. The LS6 will work just fine under boost for a few hundred more hp at the wheels.
Instructor
Joined: Feb 2024
Posts: 117
Likes: 19
From: New Jersey
I make 453 wheel on a stock manifold/tb. It will flow enough air to support it. As the texas speed said, would probably need an aggressive cam to get that out of a SBE but probably not far off from what you would need with a 102. 92/102s arent the magic bullet, you would still need heads/cam combo that will flow enough air to get you to the power level you want. A 92/102 just makes it a bit easier. You could do the heads/cam for now and see where you're at and then a manifold later if you aren't happy with the set up. I fit a FAST 102 on an LS6 no problem. Its pretty easy. I went with a billet 102mm TB from summit w/ drive by cable and had to grind anotch in it to clear the water pump. Took maybe 2 hrs to fit. I got it as a replacement for the ls6 manifold that cracked as the price difference between used ls6 and the fast 102 wasnt much.
Thread Starter
Advanced
Joined: Mar 2023
Posts: 56
Likes: 18
I make 453 wheel on a stock manifold/tb. It will flow enough air to support it. As the texas speed said, would probably need an aggressive cam to get that out of a SBE but probably not far off from what you would need with a 102. 92/102s arent the magic bullet, you would still need heads/cam combo that will flow enough air to get you to the power level you want. A 92/102 just makes it a bit easier. You could do the heads/cam for now and see where you're at and then a manifold later if you aren't happy with the set up. I fit a FAST 102 on an LS6 no problem. Its pretty easy. I went with a billet 102mm TB from summit w/ drive by cable and had to grind anotch in it to clear the water pump. Took maybe 2 hrs to fit. I got it as a replacement for the ls6 manifold that cracked as the price difference between used ls6 and the fast 102 wasnt much.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
5 Best & 5 Worst Corvette Daily Drivers
Joe Kucinski
The Headlights of Every Corvette Generation Explained
Joe Kucinski
5 Best & 5 Most Overrated Corvette Track Packages of All Time!
Joe Kucinski
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
Instructor
Joined: Feb 2024
Posts: 117
Likes: 19
From: New Jersey
Sweet, curious to see what it puts down. Just to clarify, a fast 92/102 will make more power but they're expensive. Gotta ask yourself if its worth the estimated 15-20whp for the cost. Could be a future upgrade if you want to squeeze more power out of the set up.
Thread Starter
Advanced
Joined: Mar 2023
Posts: 56
Likes: 18
Oh definitely! for ~$1500 on top of what I was spending I just didn’t have it in me to do it. I’ll be curious to see what she makes and maybe next year I’ll consider going with that setup after discussing with the tuner. I’ll report back!
Drifting
Joined: Sep 2017
Posts: 1,967
Likes: 696
From: Avon Lake OH
Considering how much power a stock LS6 manifold and throttle body have been shown to support, I would consider the TPIS modified 90mm snout LS6 intake manifold before spending 2-3 times that cost on a FAST 92/102 intake manifold. As always YMMV.
Le Mans Master
Joined: Feb 2021
Posts: 6,536
Likes: 4,376
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Melting Slicks
Joined: Aug 2007
Posts: 2,583
Likes: 415
From: Erwin, NC
I made 441 rwhp with the following:
231/237 .589/.595 112 LSA (SI5 from Speed Inc.)
Patriot Stage 2 heads (59cc)
Fast 92 intake/Ported LS2 TB/Blackwing
Kooks LTs/Kooks ORx/no mufflers
DTE Brace
LS7 clutch/LS2 Flywheel/C6Z shifter
3.73 gears
Speed Inc. tune
I wouldn’t bet on 440+ with a stock intake. Even if you get there with a radical tune, under the curve power will be lacking and that Gen2 Viper will still walk away from you.
Wait 2 months. Save up the extra cash. Put an intake on.
Last edited by 99FRC Newb; Feb 28, 2024 at 04:54 PM.
Instructor
Joined: Feb 2024
Posts: 117
Likes: 19
From: New Jersey
Here's a comparison of LS6 (blue) to FAST102 (black) for your reference.
https://ls1tech.com/forums/dynamomet...e-numbers.html
The set up is obviously different but the effect on the power curve would be the same - about 2-5% power gains throughout the curve
https://ls1tech.com/forums/dynamomet...e-numbers.html
The set up is obviously different but the effect on the power curve would be the same - about 2-5% power gains throughout the curve
Le Mans Master
Joined: Feb 2021
Posts: 6,536
Likes: 4,376
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
Here's a comparison of LS6 (blue) to FAST102 (black) for your reference.
https://ls1tech.com/forums/dynamomet...e-numbers.html
The set up is obviously different but the effect on the power curve would be the same - about 2-5% power gains throughout the curve
https://ls1tech.com/forums/dynamomet...e-numbers.html
The set up is obviously different but the effect on the power curve would be the same - about 2-5% power gains throughout the curve
Instructor
Joined: Feb 2024
Posts: 117
Likes: 19
From: New Jersey
If OP can reach his goal on a stock intake, then why go for a fast intake? The tq curve follows the same shape, just moved up. I could see the argument if the stock manifold sacrificed mid range tq in favor of high rpm hp like a short runner but that just isn't the case.
Thread Starter
Advanced
Joined: Mar 2023
Posts: 56
Likes: 18
I have the money, I just don’t think it’s worth using it on an intake at this point in time. I’ll enjoy the car as is and put money into suspension before going back to the motor. Step 1 complete: don’t blow up on first start. Fingers crossed boys! Tune in a couple hours. I made it to the gym in one piece but I did have to heel-toe anytime I slowed down significantly to keep her running.
Instructor
Joined: Feb 2024
Posts: 117
Likes: 19
From: New Jersey
I have the money, I just don’t think it’s worth using it on an intake at this point in time. I’ll enjoy the car as is and put money into suspension before going back to the motor. Step 1 complete: don’t blow up on first start. Fingers crossed boys! Tune in a couple hours. I made it to the gym in one piece but I did have to heel-toe anytime I slowed down significantly to keep her running.
https://youtube.com/shorts/J4_KIst3j...Q-74Pcw7_R8IdC
https://youtube.com/shorts/J4_KIst3j...Q-74Pcw7_R8IdC
Pro
Joined: Apr 2023
Posts: 670
Likes: 358
From: Windsor, CT
I bought some used PRC Stage 2.5 heads milled LS6 heads used off of FB. The guy I bought it from ran these heads with the TSP 233/239 cam, and showed me a Dyno sheet well north of 470 on a 5.7L. It was a Full time strip only car. I don't know the full list of mods he had to the motor, but dang....
You should have yourself a runner.
You should have yourself a runner.
