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Old 04-13-2015, 07:27 AM   #1
6ohFox
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Default Quest for 700HP N/A 370LSx

Have a thread in the LSx section more for Tech questions so figured I'd post here about the build itself. Were looking to make 700HP N/A on the engine dyno when its all said and done and still undecided on the car it will be going in but one step at a time

Spec's on the build are as such

370 CI LQ4
ARP Main Studs
ARP Head Studs
Wiesco 12CC Dome Pistons with Total seal rings
Scat 6.125 H-beam rod ARP 2000's
14:1 Compression (E85)
Stock crank polished and turned
CNC'd LS3 Casting (Hand finished by Dominic Januzzi) Milled 62CC
Ported Super Victor EFI also ported by Dom
.040 Cometic Head gaskets
4150 TB
80LB injectors
251/271 .700/.680 113 LSA Low Lash Solid roller Spec by Martin@Tick
Lunati Solid roller lifters
Jesel Shaft mount rockers
ATI Balancer
Holley HP


Here is how it started life.





Bought a 6.0 with a cracked ring for 500 bucks, Sold the 317's and little things off to help with the cleaning for the block and heads.







Here is the block and LS3's all cleaned up and ready for machining/CNC porting


To achive the high compression we were looking for we decided on some 12CC Dome pistons as well a 62CC Chambers and a .040 Gasket matched with a set of SCAT Rods with some ARP 2000's










On to picking out valve train. At first I was going to go hydraulic then shared a few emails with Martin@Tick and he brought up the LLSR's that have been gaining popularity so I went with one of Cam Motions LLSR cams paired with some PAC 1208X and soon to have Jesel LS3 shaft mounted rockers and Lunati Solid lifters








Then had the heads sent out for some CNC work here is what we have so far there is still a valve job and blending to be done as well a few tricks to get the best performance we can out of stock castings as well as the EFI LS3 super victor that will have to get some work done to match up
















This is a work in progress and as parts and things happen I will update!!
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Old 04-13-2015, 10:50 PM   #2
6UndrPressr
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Default Re: Quest for 700HP N/A 370LSx

just curious why you did not go with a super victor and 4500TB
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Old 04-13-2015, 11:07 PM   #3
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Default Re: Quest for 700HP N/A 370LSx

To get 700, out of 370, gonna need to spin it to win it.
So, while I know the stock cranks have proven reliable at high HP levels, and some higher RPM's, my question is:
This isn't exactly a budget build, so why the stock crankshaft?

Big money/good parts tied up everywhere else, would think a crank would have been a "to do" item as well.

The 700HP you are looking for, isn't the concern on the stockcrank, but you start twisting it up to 7800-8000+.

If dead set on stock crank, I would have tossed some Aluminum Rods in there.

That's just my take. parts you have should carry you to 700Pretty easy.

Ive done t build somewhat similar.

408, and a 414, both with L92's. Hydraullic rollers, Comp, T&D shaft, 12:1. We made shade over 670 on the 414", and with same cam and heads and intake as the 414", we dropped it on the 408", and didn't drop too much..made tick over 650.


So, 700 with less cubes, more compression, more cam I can see it done pretty easily.
Don't take any short cuts on the stock crank. make sure he is top shelf
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Old 04-14-2015, 01:42 AM   #4
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Default Re: Quest for 700HP N/A 370LSx

This isn't a "Budget" build like you said but its not something I'm going to spend 10k (Stock casting heads, stock block etc etc)on I'm getting a good deal on Machine work, Porting, assembly etc. think it will boil down to the balancing and time in the rotating assembly which I trust the guys at SAM to guide my buddy in putting it together think we will open a lot of eyes with this.
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Old 04-14-2015, 01:43 AM   #5
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Default Re: Quest for 700HP N/A 370LSx

Quote:
Originally Posted by 6UndrPressr View Post
just curious why you did not go with a super victor and 4500TB

This is a super victor, Martin told me the 4150 performed better at the track in their test and the 4500 just made a little more peak HP
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Old 04-14-2015, 10:49 PM   #6
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Default Re: Quest for 700HP N/A 370LSx

Quote:
Originally Posted by 6ohFox View Post
This isn't a "Budget" build like you said .

You misunderstood me. I said it WASNT a budget build, and because you have a lot of good parts, why stick with stock crank?


Again, the stock crank has proven itself at those levels (and beyond), but in all honesty, so have the stock rods and pistons.

Im just saying, with the money you have tied up in this...with good pistons, rods, heads, cam, lifters, rockers, intake, etc....a "meager" $800 for a crank would have been cheap insurance.

it's your build, and should make good power. I just wouldn't have used a stock crank in this instance. Doesn't make much sense. That's just my .02.
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Old 04-15-2015, 08:50 AM   #7
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I was agreeing with you when I said "like you said". Like you said it's proven and think it won't be an issue you have to draw the line some where when it comes to a build or you'll end up with 20k in everything. So I chose to set the line
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Old 04-15-2015, 05:21 PM   #8
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Default Re: Quest for 700HP N/A 370LSx

Quote:
Originally Posted by 6ohFox View Post
I was agreeing with you when I said "like you said". Like you said it's proven and think it won't be an issue you have to draw the line some where when it comes to a build or you'll end up with 20k in everything. So I chose to set the line


Roger that, and understood. Good luck man.
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Old 04-19-2015, 05:55 AM   #9
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Default Re: Quest for 700HP N/A 370LSx

looking forward to this, always wanted to see how much power can be made with a stock crank n/a
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Old 04-19-2015, 07:25 AM   #10
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Default Re: Quest for 700HP N/A 370LSx

Good call on going solid lifter with those springs. I ran those in my LS3 and the seat pressure was so high that it was digging the lifter into the cam. Ended up trashing the whole motor and had to rebuild.
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Old 04-20-2015, 02:56 PM   #11
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Default Re: Quest for 700HP N/A 370LSx

http://www.yellowbullet.com/forum/sh...722&highlight=
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Old 04-21-2015, 02:10 AM   #12
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Default Re: Quest for 700HP N/A 370LSx

A lot of my links are broken on the work computer

was the 730 on an engine dyno or Chassis dyno? Can't see any of the videos in my current location :/
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Old 04-21-2015, 08:51 AM   #13
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Default Re: Quest for 700HP N/A 370LSx

Engine dyno.
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Old 04-21-2015, 09:21 AM   #14
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Default Re: Quest for 700HP N/A 370LSx

Cool build, i will be curious to see what it runs down the track. If i were you i would start planning a switch to a 4500 throttle body, i think that 4150(throttle body and intake flange) will be a restriction both on the track and on the dyno. Watch what the MAP sensor does during the dyno pull, my engine had about 2" of vacuum with the 4150 and was close to 0" with the 4500.
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Old 05-12-2015, 03:00 PM   #15
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http://cimg7.ibsrv.net/gimg/ls1tech....b1a4b434e5.jpg

Some parts are rolling in!!
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