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Old 02-10-2014, 02:51 PM
  #946  
400hp944
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Originally Posted by TonyG View Post
Everyone... that's for the words of encouragement. And yes... the engine is probably the least expensive part of this project.

That said... :-) since I'm there now .... and because a set of pistons and rods cost the same no matter the engine displacement :-) It looks like I'm just going to build a LS3 short block at 6.2L vs the LS6 at 5.7L and pick up some power along the way.

Using my same CNC'ed LS6 heads, we're going to open up the valve sizes and unshroud the vavles picking the compression up with the piston.

We've plotted it on the computer and there are substantial power gains to be had going this route.

So there it is.... gonna order the parts today. Should have it back together in a couple weeks.

TonyG
Damn Tony - so sorry to hear about this. I was hoping to see you out there this weekend. I saw Dwayne several times but didn't get the chance to ask him what was going on and now I read all this. You have an amazing was of keeping a positive attitude.
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Old 02-10-2014, 03:47 PM
  #947  
docwyte
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Tony, you might want to look into a 383. I've been looking into built short/long blocks for the past month or so. A 376 costs the same as a 383, check out Texas Speed and Thompson Motorsports. I'm probably going to get a built long block from Thompson...
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Old 02-10-2014, 04:17 PM
  #948  
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What size valves are you running?
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Old 02-10-2014, 04:22 PM
  #949  
odurandina
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prepped LS7 short block w/ forged.... $5,949.87

https://sdparts.com/details/scoggin-...er/sdls7sb427d

.

Last edited by odurandina; 02-10-2014 at 06:09 PM.
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Old 02-10-2014, 04:37 PM
  #950  
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Thats a bum deal Tony. At least its a chance to upgrade.

Maybe something like this would help somewhat? Remote filter mount that has a built in primping pump that you spin with a drill.

http://www.petersonfluidsys.com/filter_mount.html
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Old 02-10-2014, 04:43 PM
  #951  
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Originally Posted by docwyte View Post
Tony, you might want to look into a 383. I've been looking into built short/long blocks for the past month or so. A 376 costs the same as a 383, check out Texas Speed and Thompson Motorsports. I'm probably going to get a built long block from Thompson...
That's pretty much what I'm doing right now... put a Texas Speed 383 forged rotating assembly into my 5.7 block. I spun some rod bearings last summer and that screwed up the stock crank, so this was what I decided to go with for a rebuild.

With a bigger budget, I think the LS3 6.2L with ported LS6 heads sounds like a great way to go. Cool how we can mix and match these engine parts, isn't it?
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Old 02-10-2014, 05:39 PM
  #952  
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Used LS7 for 9K is not a good deal. Just get a bumped out and forged internal LS3 with a 24x wheel and call it a day. Its plug and play. All uou need is a harness extension from racetronics.
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Old 02-11-2014, 12:34 AM
  #953  
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Ug, so sorry Tony. Keep your eye on the prize though. Given the extent of your build, a blown LS motor is just a flesh wound -- practically a consumable. Hang in there and add a little HP while you're at it....

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Old 02-13-2014, 03:23 PM
  #954  
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*** Update ***

The parts are ordered. Just dump another wad of cash.

The beauty of engine building these days is that if you have the right software, and all the correct data, you can fully design the engine on the computer and know within a few HP of exactly what you'll have.

Given this, we spend a couple hours on the computer designing the engine. Here's what we came up with:

LS3 stroked to 398cu in or 6.5 liters.

We didn't go bigger on the stroke because of how much the pistons hand out the bottom of the bores (even on a stock LS3). The opinion of the engine builder is that on a race engine the block would need to be sleeved to get the support necessary to go bigger reliably. And at that point you might as well use a LS7 short block $$$.

So that's where it is. A 398" LS3

The crank and rods are Callies 4340 forged pieces. The pistons are Ross forged pistons. A high flow oil pump is also getting installed.

The already CNC'ed cathedral port 243 heads are going to be opened up further (slightly) on the ports, the FAST 102 intake is getting ported to match, the combustion chambers are getting opened up to the larger bores, and larger light weight valves are getting installed.

The valve spring, retainers, rockers, and cam stay as-is, although the cam timing will be changed.

The previous LS6 made 461RWHP peak and 400RWTQ peak. Based on the computer simulations we should pick up a solid 50-60HP over the previous setup with more torque everywhere, but especially at the critical 3500-4000 rpm mark.

Parts are rolling in now and should have them all by Monday. Then another week to machine, put together and install.

Stay tuned.....

TonyG
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Old 02-13-2014, 03:48 PM
  #955  
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...


...

..

...
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Old 02-13-2014, 04:22 PM
  #956  
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So nobody's putting their hand up to accept any blame for the engine failure?
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Old 02-13-2014, 05:17 PM
  #957  
TonyG
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Originally Posted by 333pg333 View Post
So nobody's putting their hand up to accept any blame for the engine failure?
That would be a negative.

TonyG
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Old 02-13-2014, 05:52 PM
  #958  
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Which software?
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Old 02-13-2014, 06:05 PM
  #959  
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Originally Posted by BC View Post
Which software?
2001 GM Camaro PCM tuned with HP Tuners.

TonyG
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Old 02-13-2014, 09:03 PM
  #960  
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Originally Posted by TonyG View Post
That would be a negative.

TonyG
They never do...
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