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403 build - Advice and Opinions

This is a discussion on 403 build - Advice and Opinions within the Internal Engine forums, part of the LSx Technical Help Section category; I relocated mine to just behind the battery....

  1. #41
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
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    I relocated mine to just behind the battery.

  2. #42
    Spaz is My Mentor SMWS6TA's Avatar
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    403 build - Advice and Opinions

    Any updates?

    I had a rod bolt failure ate my stock crank so I'm going with a 403 build.
    Last edited by SMWS6TA; 01-03-2015 at 05:45 PM.
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, Monster Stg 4 Clutch, QT SFI BH, MWC DSL, UMI: SFC, PHB, LCA's, LCA Relocation Brackets & TA, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    Horsepower never lies, but is often lied about!

  3. #43
    Member Decadence75's Avatar
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    Bright Red
    2000 Trans Am

    Quote Originally Posted by SMWS6TA View Post
    Any updates?

    I had a rod bolt failure ate my stock crank so I'm going with a 403 build.
    Ouch! Everything else come away ok besides the crank?

    2000 Trans Am T56 Swapped - GMPP "HOT" Cam | LS6 Intake | PnP TB | 25% UD Pulley | Founders adjustable LCA/PHB/TA | Norris Catch Can | TSP 1-7/8 SS LT | TSP True Duals with bullets | SLP Lid | UMI Shock tower brace | Torq Thrust M 17x9 275/40 front 17x10.5 315/35 rear - YouTube Videos - My Car Site

  4. #44
    Spaz is My Mentor SMWS6TA's Avatar
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    so far just the #3 rod and crank journal. In case you didn't see my thread here is what I found.





  5. #45
    Member Decadence75's Avatar
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    Bright Red
    2000 Trans Am

    Since the bird is no longer my DD I have been considering changing the path I am planning for this build. Instead of a N/A 408 I am tossing around the idea of putting a D-1SC on it to have a super fun toy. Any thoughts? Would it be more trouble than its worth?

  6. #46
    Spaz is My Mentor SMWS6TA's Avatar
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    Jon would be the guy to talk with. He's got one IIRC. I know he has a supercharger.


    What's your compression ratio now? You are looking at a new cam and either pistons or heads because of CR.

    It would be an awesome build no less.

  7. #47
    Moderator 35th-ANV-SS's Avatar
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    I'm here to assist.
    It's on jackstands.

  8. #48
    Member Decadence75's Avatar
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    Bright Red
    2000 Trans Am

    Quote Originally Posted by SMWS6TA View Post
    Jon would be the guy to talk with. He's got one IIRC. I know he has a supercharger.


    What's your compression ratio now? You are looking at a new cam and either pistons or heads because of CR.

    It would be an awesome build no less.
    Right now it is a bare block and the only parts I've gotten so far are ARP head bolts and Tooley SLR lifters. So I'll be building it ground up for whichever path I go down. I just wanted some insight on the possibility of going FI vs NA. Thanks for the replies.

  9. #49
    Moderator 35th-ANV-SS's Avatar
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    I have had my Procharger installed for about 4.5 years now. I'm running 8lbs, give or take, of boost on an otherwise stock LS1 motor; hardened pushrods and upgraded springs. Everything else is stock. So, I have 10.1:1 compression. Steve aka Frost tuned the car and worked with me on recommendations on the setup. He highly recommended using methanol as a suppliment so I'm running a meth kit from Alky as well as a front mount intercooler. Have the 255lph Walbro pump and 62# injectors. At this point, the pump is my restriction if I want to run more boost (assuming I build the motor). I've read that fuel pump is only good for about 600rwhp. I'm at 500rwhp.

    Zero issues with the Procharger....knocks on wood.

  10. #50
    Spaz is My Mentor SMWS6TA's Avatar
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    From what I've read on the subject if you need more fuel Jon you'll need a twin pump setup.


    If you do go FI make sure you have high quality oil lines. One of the local guys I know has a turbo build and just lost his motor because one of the oil lines blew and lost quite a bit of oil before he could shut off.
    Last edited by SMWS6TA; 03-09-2015 at 07:23 AM.

  11. #51
    Moderator 35th-ANV-SS's Avatar
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    One good thing about Procharger is the oil for the head unit is self-contained and separate from engine oil. Recommended change period is 6K miles I believe.

  12. #52
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    Thanks for the info and tips guys. How much would you estimate that the procharger , intercooler and pipping will pile onto the already large sum this is going to cost haha

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    Junior Member 99ss405's Avatar
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    413 ci for the win ... I got a completer lq9 with 30k miles ... im just going to put a cam in it an spray the piss out of it! then order scat rods crank make a 413

  14. #54
    Junior Member 99ss405's Avatar
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    Quote Originally Posted by Decadence75 View Post
    Thanks for the info and tips guys. How much would you estimate that the procharger , intercooler and pipping will pile onto the already large sum this is going to cost haha
    id say 6k for procharger kit .. need the right cam ... upgrade fuel system and get a converter to work if it auto. and someone who knows how to tune !

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    Junior Member 99ss405's Avatar
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    not talking crap but you can built an all motor car that will stomp that car for the price of the procharger ... I called procharger in 99 they were like close to 7k . So I bought a 10,500 87 GN with 48k miles an moded it

  16. #56
    Moderator 35th-ANV-SS's Avatar
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    I have about 11-12K into my Procharger setup. I added quite a few things beyond the typical setup though and bought all new parts. My gauges for example (fuel, afr, and vacuum/boost) were pretty expensive by themselves. Fuel pump, fuel filter, pillar pod, Aster tensioner, Alky methanol kit, FMIC, injectors, push rods, valve springs, single radiator fan for room, custom fabd piping for the inlet and air filter, oil, antifreeze, new spark plugs, head unit oil, etc etc etc. It adds up fast. The "kit" is far from complete.

    That's without touching the motor for the most part.

    Have about the same into suspension, drivetrain, etc. I consider it pretty bulletproof at this point, and with M/T's it dead hooks, even in first with a 4.11 rear end gear ratio.

    I could personally care less I don't have the fastest car. Someone is always faster. It's extremely reliable and I haven't needed to fill up a bottle once. I can also get the same or better gas mileage when staying out of the throttle than when the car was stock. Power at my disposal, always. A NA car with similar power will get walked on by a FI car.

    Nothing against NA power or spraying. I know plenty of people making ridiculous power. The only drawback to FI is cost that I saw after years of reading, reviewing, and talking to several reputable LSx builders before pulling the trigger. In my case, cost was not a big factor so that's the route I went. I'm very happy with my decision. I forgot to mention, it sounds phenomenal.

  17. #57
    Member Decadence75's Avatar
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    Bright Red
    2000 Trans Am

    I might have to nix the SC idea for now then. That would essentially double the cost of the motor build.. I'll need that extra for a good rear and to get the t56 upgraded. With the NA build I should be looking at something north of 500 and as you mentioned, I am not looking for the fastest car just something very fun to drive.

  18. #58
    Moderator 35th-ANV-SS's Avatar
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    Yeah, it's not cheap that's for sure and I certainly understand considering what you have done so far.

    You could probably piece-meal a system or even pick up a used system for a more budget friendly build (4-5k ballpark I'm guessing with some effort)...but the truth of it is, there's really no such thing as budget friendly with FI.

  19. #59
    Member Decadence75's Avatar
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    Sorry that I have been so absent lately and not updating the build. The sorry truth is that I have made zero progress in the last year. I ended up sinking all my money into a new business I started this year, otherwise the engine would be done.

    I am thinking at this point I might change direction a little bit. Since I have precious little time to work on projects right now I was thinking that instead of building my engine ground up like I wanted, picking up a 408 shortblock from a reputable vendor then slapping heads/cam/intake on top of it. Shouldn't be that much of a difference in price.

    Another route I've considered is instead of spending all this bank on building an awesome N/A engine is instead just getting a 6L drop out from a truck, adding the appropriate cam and going TT like kit available here. The F2 TT kit. 98-02 F-Body Turbo Systems
    Last edited by Decadence75; 01-01-2016 at 03:23 AM.

  20. #60
    Spaz is My Mentor SMWS6TA's Avatar
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    Here's another option for turbos if interested.


    Turbo Kits



    I think because of this thread was the reason I went with a 403 build.

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