what to do with my 5.3
12-25-2015, 08:47 PM
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what to do with my 5.3 Hey guys this post is strickly asking you carb guys your opinions with a 5.3 ls build that is going in a foxbody coupe. I will be honest when I bought the lm7 I was thinking about an on 3 performance turbo build but I have since changed my mind and decided to go carb and nitrous for the simple fact that the nearest tuner is about 2 hours away and the carb would be simplier for me . What would you do to make as much power out of the 5.3 as possible on a budget. What cams are you guys running? What nitrous kits work best? I have the 862 heads port them or not ? I guess I am looking for your honest opinons on how you would go about building this from the guys that already have experience. Im ready to start buying parts and any help is greatly appreciated
12-25-2015, 09:05 PM
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Would like to add that the car will be driven often on the street and taken to the track also. will be a light factory looking foxbody coupe and will be running a automatic transmission. Want to break into the 6.80 or so range in the 1/8 at the track and be able to drive it home. What would you do to the 5.3 to get me there?
12-27-2015, 10:25 AM
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come on guys all im looking for here is if you had a full pull out 5.3 lm7 to go in a foxbody how would you go about getting the most power out of it for the least amount of money. Want to run a 150 shot on it and want to do it right the first time. would like to be around 500 crank horsepower. Any suggestions?
12-27-2015, 08:37 PM
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Thanks Doug g . I have in mind what I want to do but I guess im just wanting to hear it from someone that has done it before I order my stuff . What cam, intake, and carb would you recommend? Is there a better head than the 862 head to start with or should I send them off to get ported. I know I should have them milled to bump compression. I am on sort of a budget so I don't want to get to deep into my heads
12-27-2015, 08:53 PM
#6
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Either get your heads done or just get better heads (243's? ) to start, have them milled and/or use thinner gaskets to help with compression (stock you're at 9.5:1 or so I think)
650DP carb........750DP max effort
Cam....thinking mid 220's intake, and low to mid 230's exhaust on a 110 LSA, 106 ICL.....check with the cam guys on this first
Casting Number 706 and 862
Head: 1999+ 4.8L / 5.3 Liter Truck
Material: Aluminimum
Part Number:
12559862
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches
Stock Head Flow Numbers
Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
Intake 200 cc----------63 ---128----179-----210----218----221-----226
Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174
Head: 1999+ 4.8L / 5.3 Liter Truck
Material: Aluminimum
Part Number:
12559862
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches
Stock Head Flow Numbers
Chamber 61.15 cc----0.100--0.200--0.300-- 0.400--0.500---0.550---0.600
Intake 200 cc----------63 ---128----179-----210----218----221-----226
Exhaust 70 cc----------54 -- 93 ----121----145-----163----168----174
Cam....thinking mid 220's intake, and low to mid 230's exhaust on a 110 LSA, 106 ICL.....check with the cam guys on this first
Last edited by Doug G; 12-27-2015 at 09:01 PM.
12-28-2015, 11:59 AM
#7
Sorry I had missed this. Had not been on a couple days.
If it is in you budget, 243 heads and if you can take the engine apart and gap the rings, you can throw a lot of nitrous at that engine. Gapped for a 300 shot that thing will fly.
A custom cam for your requirements is not needed but if you a max effort 5.3 with nitrous it can be done. There are guys pushing the 5.3 to 5.2 second in the 1/8 with nitrous.
So what does the budget look like?
If it is in you budget, 243 heads and if you can take the engine apart and gap the rings, you can throw a lot of nitrous at that engine. Gapped for a 300 shot that thing will fly.
A custom cam for your requirements is not needed but if you a max effort 5.3 with nitrous it can be done. There are guys pushing the 5.3 to 5.2 second in the 1/8 with nitrous.
So what does the budget look like?
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12-29-2015, 11:33 AM
#8
Hey guys this post is strickly asking you carb guys your opinions with a 5.3 ls build that is going in a foxbody coupe............................................. What would you do to make as much power out of the 5.3 as possible on a budget. What cams are you guys running? What nitrous kits work best? I have the 862 heads port them or not ? ...............................
Quick and cheap:
remove your heads, have a 3 angle valve job and have them milled .015". Use a stock head gasket and put them back on. Get this cam: http://store.cammotion.com/hot-stree...reted-camshaft and a Victor Jr. intake and a Holley 750 HP carb or a Quick Fuel Q series 750 carb. Get some 1 3/4" headers or 1 7/8" headers if you plan to get a larger engine someday. Get a 9.5" converter setup for however much nitrous you intend to spray. Get a TH400 trans if you plan to drive it on the street and keep it mild or a glide if this thing is going to be a race car only and you plan to step up later.
If you want to spend a little more money and make a few more horses, get some CNC ported 5.3 heads. If you plan to step up to a more serious engine later, get a Super Victor instead of the Vic Jr.
This should be good up to a 200 shot or so.
12-29-2015, 05:56 PM
#9
10 Second Club
https://ls1tech.com/forums/carburete...vid-added.html
Serioussn95
Hey guys im finally almost done with my new build so I figured I would start a new thread. This car previously had a SBE 5.3 225k LKQ motor that i did a VERY basic cam only/nitrous setup on which worked very well. After getting bored with the nitrous setup I took the plunge to go Forged Iron Block 370/6.0 with my own built S480 turbo setup.... Heres a run down of the simple 5.3 setup that netted me a 11.80s on motor and low 10s on nitrous.
OLD SETUP
03 5.3 225k mileage (don't care lol paid 500.00)
melling hv pump
ls2 timing set
GMPP ASA cam 226/236 .525/.525 110
Mls gaskets
comp 7.4 pushrods
Chinese head studs
862 heads milled .030
Comp 26-915 beehive springs
NGK Br7EF plugs
edelbrock vic jr intake
msd 6010
Barry Grant Mighty Demon 750 annular carb
Dynatech 1 7/8 longtubes, x pipe, ultra flo mufflers
Jw Th400 Reverse manual transbrake trans
Revmax Billet 3600 nitrous convertor
3100lb SN95 mustang
Full Upr chromoly tubular front everything
strange 10 way front/rear
Full Team Z rear suspension
1000hp 8.8 rear (spool,4.10,33spl mosers)
275/60/15 rear
The car was tuned on 93 pump gas for the motor and has a front cell for nitrous that runs 118 Outlaw N20 fuel.
In 97 degree heat the car made 308 WHP on motor through the TH400. The car made 475 wheel on a 15 year old nitrous works single plate on a 175. We did jet the car to 225 but, with the ASA cam being a 110 lob sep It didn't pick up enough hp to justify spraying it with that so I backed it down to the 175.
Hey guys im finally almost done with my new build so I figured I would start a new thread. This car previously had a SBE 5.3 225k LKQ motor that i did a VERY basic cam only/nitrous setup on which worked very well. After getting bored with the nitrous setup I took the plunge to go Forged Iron Block 370/6.0 with my own built S480 turbo setup.... Heres a run down of the simple 5.3 setup that netted me a 11.80s on motor and low 10s on nitrous.
OLD SETUP
03 5.3 225k mileage (don't care lol paid 500.00)
melling hv pump
ls2 timing set
GMPP ASA cam 226/236 .525/.525 110
Mls gaskets
comp 7.4 pushrods
Chinese head studs
862 heads milled .030
Comp 26-915 beehive springs
NGK Br7EF plugs
edelbrock vic jr intake
msd 6010
Barry Grant Mighty Demon 750 annular carb
Dynatech 1 7/8 longtubes, x pipe, ultra flo mufflers
Jw Th400 Reverse manual transbrake trans
Revmax Billet 3600 nitrous convertor
3100lb SN95 mustang
Full Upr chromoly tubular front everything
strange 10 way front/rear
Full Team Z rear suspension
1000hp 8.8 rear (spool,4.10,33spl mosers)
275/60/15 rear
The car was tuned on 93 pump gas for the motor and has a front cell for nitrous that runs 118 Outlaw N20 fuel.
In 97 degree heat the car made 308 WHP on motor through the TH400. The car made 475 wheel on a 15 year old nitrous works single plate on a 175. We did jet the car to 225 but, with the ASA cam being a 110 lob sep It didn't pick up enough hp to justify spraying it with that so I backed it down to the 175.
12-30-2015, 09:35 AM
#10
Restricted User
You can get away without the pump, pushrods, timing chain, etc.
Stock 5.3.
Mild carb cam. 110 or 112 LSA at the most. No more than .550" lift.
PAC 1218 springs (Spring pressures are low enough that you won't bend pushrods, break chains, etc).
Studs and gaskets up to you.
Single plane intake.
600-750 CFM carb depending on what else it'll be used for.
Long tubes.
~100-250 shot depending on chassis setup, traction, weight, etc.
Stock 5.3.
Mild carb cam. 110 or 112 LSA at the most. No more than .550" lift.
PAC 1218 springs (Spring pressures are low enough that you won't bend pushrods, break chains, etc).
Studs and gaskets up to you.
Single plane intake.
600-750 CFM carb depending on what else it'll be used for.
Long tubes.
~100-250 shot depending on chassis setup, traction, weight, etc.
12-30-2015, 11:49 PM
#11
Bottles run out, turbo's just keep delivering boost.
Choose wisely.
But seriously if you want run juice do a dual stage system, like 250-400hp, with a separate fuel system running race fuel injected with the juice & enjoy.
Eventually you will get sick of filling bottles (& the money evolved) & decide to go turbo. Best decision you will ever make.
22yrs nitrous free & loving every boosted second.
Choose wisely.
But seriously if you want run juice do a dual stage system, like 250-400hp, with a separate fuel system running race fuel injected with the juice & enjoy.
Eventually you will get sick of filling bottles (& the money evolved) & decide to go turbo. Best decision you will ever make.
22yrs nitrous free & loving every boosted second.
Last edited by gtfoxy; 12-30-2015 at 11:55 PM.
12-31-2015, 03:54 AM
#12
When you build a car that doesn't need nitrous all the time it is not a big deal. I know many a NA car that destroy many turbo builds. But there are a thousand ways to do it. I use the nitrous when I want because I don't have to against other cars in my weight class. A 5.3 doesn't make the power of the bigger 5.7+, so there is a need for extra all the time. Turbo is expensive initial cost and extensive build time. Nitrous, slap on a plate and fuel cell.