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LS3 Carbed build

General engine tech -- Drag Racing to Circle Track

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CGT
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LS3 Carbed build

Post by CGT » Fri Nov 17, 2017 11:14 am

I have a complete LS3 core laying around. I've held on to it figuring there will be a point when my supercharged LS3 Camaro's stock shortblock will give up on me.

I have a friend that runs a carbed(methanol) LS in his bracket car. His motor is tired, and he wants to replace it or fix it. I'm thinking about building an engine for him with this core(or to keep as a dyno mule) :D What do you guys think it could make? I want to use as many factory parts as possible(crank, rods, valves, rockers etc.) Any ideas or guesses?


4.070 x 3.622
14:1 Compression
Hydraulic Roller (under .700 lift)
LS3 heads
Super Victor Intake
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Re: LS3 Carbed build

Post by Frankshaft » Fri Nov 17, 2017 12:50 pm

CGT wrote:
Fri Nov 17, 2017 11:14 am
I have a complete LS3 core laying around. I've held on to it figuring there will be a point when my supercharged LS3 Camaro's stock shortblock will give up on me.

I have a friend that runs a carbed(methanol) LS in his bracket car. His motor is tired, and he wants to replace it or fix it. I'm thinking about building an engine for him with this core(or to keep as a dyno mule) :D What do you guys think it could make? I want to use as many factory parts as possible(crank, rods, valves, rockers etc.) Any ideas or guesses?




4.070 x 3.622
14:1 Compression
Hydraulic Roller (under .700 lift)
LS3 heads
Super Victor Intake
700+

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Re: LS3 Carbed build

Post by CGT » Fri Nov 17, 2017 1:09 pm

Frankshaft wrote:
Fri Nov 17, 2017 12:50 pm
CGT wrote:
Fri Nov 17, 2017 11:14 am
I have a complete LS3 core laying around. I've held on to it figuring there will be a point when my supercharged LS3 Camaro's stock shortblock will give up on me.

I have a friend that runs a carbed(methanol) LS in his bracket car. His motor is tired, and he wants to replace it or fix it. I'm thinking about building an engine for him with this core(or to keep as a dyno mule) :D What do you guys think it could make? I want to use as many factory parts as possible(crank, rods, valves, rockers etc.) Any ideas or guesses?




4.070 x 3.622
14:1 Compression
Hydraulic Roller (under .700 lift)
LS3 heads
Super Victor Intake
700+
Really? I was thinking quite a bit less than that.
"Never let your hobby ride you. Work while you work and play while you play"

"Hobbies are a contradiction; they take work and turn it into leisure, and take leisure and turn it into work."

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Re: LS3 Carbed build

Post by Frankshaft » Fri Nov 17, 2017 1:14 pm

I guess it all depends. But it is possible. 650 real easy.

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Re: LS3 Carbed build

Post by CGT » Fri Nov 17, 2017 1:37 pm

Frankshaft wrote:
Fri Nov 17, 2017 1:14 pm
I guess it all depends. But it is possible. 650 real easy.
Yeah i was kinda thinking 650. But I honestly dont know what to expect. Any tips or ideas on anything Frankshaft? Valve events, porting, valve job?

Thanks
Chad
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Re: LS3 Carbed build

Post by autogear » Fri Nov 17, 2017 2:08 pm

Fill out a cam request for Jones Cams?

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Re: LS3 Carbed build

Post by CGT » Sat Nov 18, 2017 9:44 am

No more biters?
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Re: LS3 Carbed build

Post by Frankshaft » Sat Nov 18, 2017 9:48 am

They respond to less intake duration, big spreads on ex, and WIDE lobe seps. like out to 118. Being a carb and 14:1 on methanol, could throw a monkey wrench in that, never ran one with that combo.

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Re: LS3 Carbed build

Post by CGT » Sat Nov 18, 2017 10:36 am

Frankshaft wrote:
Sat Nov 18, 2017 9:48 am
They respond to less intake duration, big spreads on ex, and WIDE lobe seps. like out to 118. Being a carb and 14:1 on methanol, could throw a monkey wrench in that, never ran one with that combo.
Thanks. I'm looking at COMP CAMS LOBE#13065 Intake #3447 Exhaust on 111 or 112 currently. Have you messed with the heads much?
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Re: LS3 Carbed build

Post by randy331 » Sat Nov 18, 2017 1:28 pm

What do the LS engine builders think of the GM 88958675 intake for LS ?
Or what other one should I look at ?

Got 6.0 that I'm doing that will get a single plane and carb.

4.030 bore" x 4" stroke, 10.5-1 comp- ported 243 casting heads, 243-258 @ .050" Comp Hyd roller. Mahle flat tops with 1mm 1mm 2mm rings.

How much power should I expect from this one ?

Hope Chad don't mind me posting this LS on here too ?? :D

Randy

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Re: LS3 Carbed build

Post by CGT » Sat Nov 18, 2017 3:07 pm

randy331 wrote:
Sat Nov 18, 2017 1:28 pm
What do the LS engine builders think of the GM 88958675 intake for LS ?
Or what other one should I look at ?

Got 6.0 that I'm doing that will get a single plane and carb.

4.030 bore" x 4" stroke, 10.5-1 comp- ported 243 casting heads, 243-258 @ .050" Comp Hyd roller. Mahle flat tops with 1mm 1mm 2mm rings.

How much power should I expect from this one ?

Hope Chad don't mind me posting this LS on here too ?? :D

Randy
Id guess 625hp and 560 torque on yours but who knows.

I believe the 88958675 is the same as Edelbrock 28097. But I can find any published information on sizes for any of the LS carbed intakes.

I dont know if i should do the Victor Jr or Super Victor on mine, 4150 or 4500. Anyone know anything about any of these manifolds?
"Never let your hobby ride you. Work while you work and play while you play"

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Re: LS3 Carbed build

Post by CGT » Sun Nov 19, 2017 9:35 am

Resized_20160609_102625.jpeg
Would it be worth offset doweling the cylinder head over?
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Re: LS3 Carbed build

Post by A_VAS » Sun Nov 19, 2017 3:38 pm

what bore you sitting on there? 4.070 ?
too lazy to make power w/o boost

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Re: LS3 Carbed build

Post by CGT » Sun Nov 19, 2017 4:08 pm

A_VAS wrote:
Sun Nov 19, 2017 3:38 pm
what bore you sitting on there? 4.070 ?
Thats 4.005 pictured. I will be using a 4.070.
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Re: LS3 Carbed build

Post by JodyB » Sun Nov 19, 2017 4:21 pm

Dual 4 hi-ram:)
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