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Am i missing anything?

This is a discussion on Am i missing anything? within the Internal Engine forums, part of the LSx Technical Help Section category; Hey all, new to this group. I just bought my first Ls platform. Ill Tell you what I bought, what ...

  1. #1
    Junior Member
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    Austin Tx
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    White
    2002 Is300

    Am i missing anything?

    Hey all, new to this group. I just bought my first Ls platform. Ill Tell you what I bought, what I plan to do, and I want to know if there is something I am overlooking.

    Bought:
    5.3 (LM7 12567392 Block) Short block
    LS6 Heads (243 stamp)
    Ls1 Intake (12560688)

    The motor had a bad lifter and started to flatten the cam. previous over removed cam and lifters already. a buddy and I took the heads off to inspect everything. I plan to take the motor and heads to the machine shop to have everything cleaned and looked over for cracks. If it all passes I plan to put it together with...

    LM7 lower end (stock and put back together by the machine shop)
    LS6 Heads
    Ls6 Cam (with measured pushrods)
    LS1 intake (possibly an LS6 if I come across one low cost)

    My main question is, will this all go together in harmony? I'm not trying to make a record HP motor, Just a decent one to put in my IS300. I will have PLENTY of questions to come, and I'm ready for all the advice and input from you guys (and gals).

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Am i missing anything?

    yes, but a few suggestions.

    Do a LS6 Intake. Better flow and volume over LS1.
    Pick a better cam if you're already having to do a cam. I can look up some specs that doesn't require super tuning or a bunch of other stuff to work.
    Melling 10295 oil pump & LS2 timing chain - again might as well put in better/new parts to replace the old ones have wear on.
    Heads -if you got 243, good. 799 same head just made from different location.
    Verify you have a 5.3 & not a 4.8. Check the pistons. I've been seeing a lot of "5.3's for sell that are 4.8's.

    I may have some more suggestions but for now this will work.

    What's it going in?
    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. #3
    Junior Member
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    White
    2002 Is300

    I had just thought of the oil pump, I plan on replacing that. as for timing chain, do different ones give better performance, or is it about quality? I ran the stamp on the motor and it is a 5.3, thankfully.
    So LS6 intake is the way to go. I assumed the cam would compliment the heads, is why I was thinking an LS6 cam. I don't know the first thing about cams or what to even start looking for, ill do some readying on the sticky above.

    its going into an '02 Lexus IS300

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    LS6 and LS1 cams are just about the same in performance.

    For a 5.3 the TS&P stg2 cam comes in 2 ways and will work with stock springs or a slightly bigger one: 212/218 with a 0.060"/0.060" spring on intake and exhaust will average 62hp & 29tq increase over stock cams. The same specs but with a 0.500" spring will yield 51hp & 23tq. The LSA - 114-115 will sound close to stock, for more chop/old school sound a lower LSA of no lower than 110 for auto will sound good. TS&P states that no tuning required for this setup but if you do get one it will benefit more from the fine tuning.

    Their stg 3 cam - is a 216/220 with a 0.500" spring will yield 54hp/22tq but will require a few extra things like tune, LS6 Beehive Springs & a 2600-2800 stall.

    The first set of numbers is the intake side/exhaust side where the valves will open and close profile. The LSA stands for Lobe Separation Angle - how much overlap the valves have when open.


    There are a lot of shops/stores that have good info on Cams - I trust Brian Tooley, Martin Springwood, Geoff form Engine Power Systems (He's my tuner) Tick Performance, and Texas Speed & Performance. Pretty much all use CompCams to make their cams.


    Just saw where you located at, Hell you have Martin Brothers near you and a few other good speed shops. I used to be station at Ft Hood a few times. Austin and San Antonio as well as Dallas were my play ground. Family lives in Denton/Dallas area.

  5. #5
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    2002 Is300

    when searching for parts for this motor, what "vehicle" should I say its for? I'm looking at prices on cams, lifters, ls2 timing chains etc.

    also, I plan on putting a manual trans behind the motor. probably the 6 speed that is usually behind these. would that change cam style? id like a little rumble so it sounds beefier.
    Last edited by LSis300; 01-03-2018 at 01:41 PM.

  6. #6
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    You can go lower in the LSA like a 109 to 112 like mine.

    I just happen to know of a T56 that could be for sell that comes with the Bell Housing, aftermarket shifter and slave. I'd have to check to see if it has the MC as well if interested.


    What year or vehicle did it come from? You will need to check the Crank Sensor for color. Black = 24x and Grey = 58x. This is a very important factor in that you need the correct wire harness and ecm.


    LS7 lifters are the go to lifters unless you are building serious power. They are the standard replacement for all GEN III/IV LS motors.


    Cams (to a degree), Water/Oil Pumps and Timing Chains for GEN III & IV are interchangeable. 4.8, 5.3, LS1,2,6, LQ4 & LQ9's The oil pick up tube, pistons and rod lengths is where you start having to be more specific.
    Last edited by SMWS6TA; 01-03-2018 at 02:48 PM.

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