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Project Murphys Law *C6*332ci*Twin s256's*

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Old 03-30-2014, 05:20 PM
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Default Project Murphys Law *C6*332ci*Twin s256's*

So I built this car about a year ago and never made a build thread about it so here we go. This is my "driver" that I take to the shop every day and was in no way built has a "racecar". I have to thank Mike @ Alphatuning for his help with the build, I could not have finished it without him, or crushed over 300 beers throughout the build.

The car started with the LS2 completely stock except the Vic Jr. It made 550 whp @ 5psi. I decided to do a cam and when I got the cam out the bearings looked like **** for only having 60k on them. So out the motor came and this is what I did -

Motor -
LS2 Block
4.8 crank
Eagle L19 6.4" rod
Diamond Pistons
Arp Mains and Headstuds
243 Heads - 2.02/1.6 Manley Valves
LS9 gaskets
Howards Cam - 226/232 .578/.587 112
.600 Beehive springs
Ti Retainers
Comp pushrods
LS7 Lifters
Comp Roller Rockers

Twin BW s256's T3 .76
Turbosmart everything

Snow Performance Meth

id1000's
340 Intank
A1000 External

Both tanks currently sumped and hooked together with the factory transfer disconnected.

I have had just about every fuel system known to man in this car. The best part is that none of them worked correctly. IF you have a c6 you know how much fun it is to drop the tanks so I will not be switching my fuel setup for awhile.


Follow build #4 and see pics from all the builds on Facebook. Have you spotted Murphy anywhere? Post, Like and Share.

facebook.com/murphycorvette/

Last edited by Zero_2_Sixty; 02-16-2017 at 07:30 AM.
Old 03-30-2014, 07:16 PM
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How are spark plug changes ? HAHA
Old 03-30-2014, 07:55 PM
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Nice build! Did you fab the intake elbow?
Old 03-30-2014, 08:01 PM
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Very nice, what kind of PSI /numbers are you putting down?
Old 03-30-2014, 08:11 PM
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Originally Posted by transam69230
How are spark plug changes ? HAHA

Induces suicide. Its kinda like a puzzle that can only be done one way. IF I were to do a twin turbo corvette again it would definately be rear mounts just for that reason. well and the underhood temps as well.

Originally Posted by 6togo
Nice build! Did you fab the intake elbow?
Yes


Originally Posted by schmendog
Very nice, what kind of PSI /numbers are you putting down?
Dont know yet. Its pretty stupid actually. I have a dyno and have yet to put my own car on it. what do ya do.
Old 03-30-2014, 10:00 PM
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Those headers are like a work of freakn art... lol did you fab them?
Old 04-01-2014, 03:25 AM
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How high into the rpm range do you get? What's the power feel like lower in the rpm band? Very cool project. Please post numbers after you dyno the car.
Old 04-01-2014, 05:50 AM
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brilliant using the 4.8 crank. I bought a 4.8 short block and am considering the same thing, short stroke, high rpm turbo screamer

thanks for posting up the buld, the fab work is fantastic

can you show the hood? I'm wondering what size scoop is needed to fit the single plane and elbow under it. looks killer.

like the way you routed the pressure side tubes, reiminds me of the OLD TTi low HP kits. but very serviceable

that kit with some nice cast manifolds like ttix does woudl make the plug changes a snap. your manifolds are much nicer and likely spool/flow better though!

now tune that rascal and go have some fun. I've been driving my turbo Z06 to work now that the weather is nice and it starts the day off right!
Old 04-01-2014, 07:27 AM
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*sub'd* for pics and updates.
Old 04-01-2014, 08:17 AM
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Been waiting to see twin s256 on a ls build. Are they Bullseye Power units?
Old 04-01-2014, 11:58 AM
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Looks great! Very similar setup shortblock to mine, so definitely interested to see how yours performs.
Old 04-01-2014, 12:12 PM
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Sick build. Very cool. Been planning a similar, small cube'd, solid roller setup now for a build. Very cool to see. Good work man!
Old 04-02-2014, 09:52 AM
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Originally Posted by boostpower54
Those headers are like a work of freakn art... lol did you fab them?
Yes we made them

Originally Posted by 94 slow
How high into the rpm range do you get? What's the power feel like lower in the rpm band? Very cool project. Please post numbers after you dyno the car.
I have been taking it to 7ish. Its a little sluggish below 2500 but who cares in my opinion. When I had the stock LS2 turbo'd with this setup it would light these little guys up right away. Would make power like right now. Was actually a little annoying to drive. So moving the power up a bit is actually pretty nice

Originally Posted by Sarg
Been waiting to see twin s256 on a ls build. Are they Bullseye Power units?
Yes just a box s256

The car is really fun with those turbos. I pretty much recommend them to anyone that comes into my shop that wants a twin setup for their street car. I can get full boost with like 40% throttle.
Old 04-02-2014, 09:56 AM
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Originally Posted by rkreigh
brilliant using the 4.8 crank. I bought a 4.8 short block and am considering the same thing, short stroke, high rpm turbo screamer

thanks for posting up the buld, the fab work is fantastic

can you show the hood? I'm wondering what size scoop is needed to fit the single plane and elbow under it. looks killer.

like the way you routed the pressure side tubes, reiminds me of the OLD TTi low HP kits. but very serviceable

that kit with some nice cast manifolds like ttix does woudl make the plug changes a snap. your manifolds are much nicer and likely spool/flow better though!

now tune that rascal and go have some fun. I've been driving my turbo Z06 to work now that the weather is nice and it starts the day off right!
I have a Corvette Creationz hood on it now. plenty of room underneath. I had an ACI hood on it before this one and it also fit fine.

When we started this kit we had a couple goals, one of them was to not run piping out in the wheel wells like the TTi kits. Very serviceable is a stretch. After you take the stuff in and out a couple times its not too bad. Just like a big puzzle that only goes one way.

Pics -

Old 04-02-2014, 12:30 PM
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Can you provide the PN for the pistons and rods you used? I have a 4.8 crank sitting here along with a block i plan to build.
Old 04-02-2014, 01:19 PM
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i have a picture of those headers saved on my laptop. they are purrrrrdy!
Old 04-02-2014, 01:35 PM
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Originally Posted by Ping King
Can you provide the PN for the pistons and rods you used? I have a 4.8 crank sitting here along with a block i plan to build.
I do not remember what the pn was for the pistons but the specs were -

1.8cc , 4.010 in. 1.12 CH 3mm 1.5 1.5

Eagle rods - CRS6460H3DL19
Old 04-02-2014, 01:38 PM
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Originally Posted by Jakson
Looks great! Very similar setup shortblock to mine, so definitely interested to see how yours performs.
I actually saw your setup first and did the math on it and was like..2:1 rod stroke ratio.. thats interesting. I think ill try it.
Old 07-12-2015, 09:15 AM
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How much boost and power/tq you get with this setup?

Great build man!
Old 02-16-2017, 07:27 AM
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Check out all the pics and follow the latest build

facebook.com/murphycorvette


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