Fuel system for LS 383 stroker
Thread Starter
Racer
Joined: Jul 2010
Posts: 411
Likes: 88
From: Hutto, Texas
Fuel system for LS 383 stroker
Hello!
I am currently in the process of having a 383 stroker engine built for my 2002 Z06, and it dawned on me, I may be pushing the limits of the factory fuel system. currently the fuel system in the car has the stock pump and stock injectors. What should I upgrade in the fuel system to support the new build? Planned engine specs are as follows: Forged 383 rotating assembly with ICON FHR pistons with 3.2cc reliefs, EPS 236/248 .604/.604 lift 110+3 lsa cam, AFR Mongoose 230 heads with 62cc chambers, FAST 92 intake and LS2 throttle body, LG Super Pro headers and catless mids, OE Titanium mufflers. not sure what to expect power wise, hoping for 550-600 horse at the crank.
Thanks in advance!
I am currently in the process of having a 383 stroker engine built for my 2002 Z06, and it dawned on me, I may be pushing the limits of the factory fuel system. currently the fuel system in the car has the stock pump and stock injectors. What should I upgrade in the fuel system to support the new build? Planned engine specs are as follows: Forged 383 rotating assembly with ICON FHR pistons with 3.2cc reliefs, EPS 236/248 .604/.604 lift 110+3 lsa cam, AFR Mongoose 230 heads with 62cc chambers, FAST 92 intake and LS2 throttle body, LG Super Pro headers and catless mids, OE Titanium mufflers. not sure what to expect power wise, hoping for 550-600 horse at the crank.
Thanks in advance!
Last edited by Raith; Mar 3, 2025 at 05:46 PM.
Running Guns & Moonshine
Joined: Aug 2001
Posts: 12,578
Likes: 7,254
From: CT
A single 450 will cover 600 crank when a single 255 covers 600rw, so it is a very safe margin for error. Factory lines will cover the need. Injectors will need to be upgraded and on that I refer to your tuner for which brand they are most comfortable working with.
If you ever need additional pumps because you change plans with the car it is easy enough to add an external pump and lines.
This NA build is easy. If you go up from here then the fuel system can become pricy.
If you ever need additional pumps because you change plans with the car it is easy enough to add an external pump and lines.
This NA build is easy. If you go up from here then the fuel system can become pricy.
Pro
Joined: Mar 2007
Posts: 738
Likes: 226
From: Coast of San Mateo CA
If you haven't purchased that cam yet I would reconsider.
Tony Mamo who designed your AFR 230 heads built a NA 383 with 225 heads, (20 years ago)
same intake & tb used a 234*/238* 114*+2* that made 585 @ crank, then a
239*/243* made 594, BUT lost a big chunk of low and mid-range torque.
I have never seen Tony use more than a +8* Exhaust split
on a NA application with a good exhaust system, usually 4-6*.
The AFR heads have very good exhaust to intake efficiency and do not require large splits.
Just my .02
Tony Mamo who designed your AFR 230 heads built a NA 383 with 225 heads, (20 years ago)
same intake & tb used a 234*/238* 114*+2* that made 585 @ crank, then a
239*/243* made 594, BUT lost a big chunk of low and mid-range torque.
I have never seen Tony use more than a +8* Exhaust split
on a NA application with a good exhaust system, usually 4-6*.
The AFR heads have very good exhaust to intake efficiency and do not require large splits.
Just my .02
Last edited by Navy Blue 210; Mar 3, 2025 at 07:32 PM. Reason: changed 578 to 585 (AFR 205-225)
Thread Starter
Racer
Joined: Jul 2010
Posts: 411
Likes: 88
From: Hutto, Texas
If you haven't purchased that cam yet I would reconsider.
Tony Mamo who designed your AFR 230 heads built a NA 383 with 225 heads, (20 years ago)
same intake & tb used a 234*/238* 114*+2* that made 578 @ crank, then a
239*/243* made 594, BUT lost a big chunk of low and mid-range torque.
I have never seen Tony use more than a +8* Exhaust split
on a NA application with a good exhaust system, usually 4-6*.
The AFR heads have very good exhaust to intake efficiency and do not require large splits.
Just my .02
Tony Mamo who designed your AFR 230 heads built a NA 383 with 225 heads, (20 years ago)
same intake & tb used a 234*/238* 114*+2* that made 578 @ crank, then a
239*/243* made 594, BUT lost a big chunk of low and mid-range torque.
I have never seen Tony use more than a +8* Exhaust split
on a NA application with a good exhaust system, usually 4-6*.
The AFR heads have very good exhaust to intake efficiency and do not require large splits.
Just my .02
Burning Brakes
Joined: Oct 2016
Posts: 1,209
Likes: 363
From: Massillon Ohio
A single 255 pump would be fine with a set of stock ls3 injectors. That pump will let you keep the stock filter/regulator unit. Any pump above that will need an external regulator and filter.
Le Mans Master
Joined: Sep 2017
Posts: 5,215
Likes: 1,529
From: Pasadena, MD
2023 C5 of the Year Finalist - Modified
That cam is similar to the cam I'm running in a centrifugal supercharged 416. I agree with Navy Blue. I'd sell that cam you have and get something similar to the cam Tony used.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Pro
Joined: Jan 2016
Posts: 680
Likes: 255
2021 C5 of the Year Finalist - Modified
i run the older racetronix kit @ 520rwp and plenty of head room
also running ls3/7 oem injectors
this is their current one: https://www.racetronix.biz/k/c5-fuel...e/rfpk-055-255
also running ls3/7 oem injectors
this is their current one: https://www.racetronix.biz/k/c5-fuel...e/rfpk-055-255
Last edited by Efx; Mar 7, 2025 at 03:58 PM.
Instructor
Joined: Jan 2015
Posts: 196
Likes: 53
From: Sun City AZ
ROGER THAT...I can't wait till they are done with it to get more photos and the amazing sound which was one of my goals...cars with multi intakes going off just sound great.....were missing that nowadays
Instructor
Joined: Jan 2015
Posts: 196
Likes: 53
From: Sun City AZ
I believe it should since everyone (engine builders) have know for decades individual ports being fed fuel respond better and over a much greater toque curve. Mine is controlled/managed by Haltech who products are in use all over the world. I was not overly concerned about HP numbers with a stock cam, but more about drivability.
Instructor
Joined: Jan 2015
Posts: 196
Likes: 53
From: Sun City AZ
Running Guns & Moonshine
Joined: Aug 2001
Posts: 12,578
Likes: 7,254
From: CT
A new contender enters the ring. About half price of the other two we looked at as well as a finished product. Excellent. Not an exorbitant price at all for someone who either doesn't mind cutting their hood or running a custom plenum under a cowl. I think one of the others had longer runners, reaching across the valley for each cylinder.
Count me in for the video when this thing gets running. What heads/cam/compression are stashed under it?
Count me in for the video when this thing gets running. What heads/cam/compression are stashed under it?