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LS3 6.2L 376ci/480HP Engine Install Thread

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Discussion starter · #21 ·
Update LS3 6.2L 376ci/480HP Engine Install Thread

Still getting Parts together.

I'm using Dirty Dingo Slider engine mounts. They are adjustable from 1/2" back to 2 1/2" forward.

I'm installing the LS in the same (stock) position as the 355 was so I will be able to use the existing crossmember and the shifter will be in the exact same location.

These brackets will allow me to make fine adjustments if needed to make it all work perfect.

I'll post a complete parts list soon
 
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Discussion starter · #23 ·
Old motor was a 4 bolt main 355 roller motor. 10:1 compression. Edelbrock performer rpm alum heads comp roller cam. Air gap intake. Holly DP and Hooker Procomp headers. Approx 420 hp
 
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#24 ·
Vega$69 said:
Old motor was a 4 bolt main 355 roller motor. 10:1 compression. Edelbrock performer rpm alum heads comp roller cam. Air gap intake. Holly DP and Hooker Procomp headers. Approx 420 hp
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Wow john that sounds very close to my new motor. ZZ4 short block edelbrock etec 200 heads comp xr288hr cam air gap Holley dp. Hopefully it runs good:yes:
 
#27 ·
Vega$69 said:
Went with the GM performance kit. I think it was $1170. Includes the muscle car oil pan, wiring harness, ECM, all the senors inluding O2 sensors and MAF

Complete plug an play package specifically this LS3 so no tuning will b needed.

Based on my research it's the best bang for the buck.

I'm locating the motor in the exact same position as the 355 so the crossmember we have will work and the shifter will be in the exact same location.
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John I was looking at combo's on Jegs and it seems the GM kit went up ?? I think somewhere around 1450 for that kit now ?? I was just window shopping LOL.
 
#28 ·
Vega$69 said:
Went with the GM performance kit. I think it was $1170. Includes the muscle car oil pan, wiring harness, ECM, all the senors inluding O2 sensors and MAF

Complete plug an play package specifically this LS3 so no tuning will b needed.

Based on my research it's the best bang for the buck.

That is a great price! I'm going with the Hooker/Holley route and all those parts will be well over $1,500.00 minus the 02 sensors and MAF, I haven't got that far yet. My estimate on my build LQ9 with LS3 heads, T56 LVL 2...from mechanical to hydraulic, tank inc. for efi, will be in the vicinity of 12K. I plan on using PSI for the ecm, and harness with a recommendation from Brent, glad to see you used them also..
Click to expand...
 
Discussion starter · #29 ·
dondb said:
Vega$69 said:
Went with the GM performance kit. I think it was $1170. Includes the muscle car oil pan, wiring harness, ECM, all the senors inluding O2 sensors and MAF

Complete plug an play package specifically this LS3 so no tuning will b needed.

Based on my research it's the best bang for the buck.

That is a great price! I'm going with the Hooker/Holley route and all those parts will be well over $1,500.00 minus the 02 sensors and MAF, I haven't got that far yet. My estimate on my build LQ9 with LS3 heads, T56 LVL 2...from mechanical to hydraulic, tank inc. for efi, will be in the vicinity of 12K. I plan on using PSI for the ecm, and harness with a recommendation from Brent, glad to see you used them also..
Click to expand...
You'll still need to dyno tune after you get the base set up from Jon at PSI
Click to expand...
 
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#30 ·
I can wait for the next update, some questions already,

What bell housing? using a Hyd clutch and not the stock mech? what parts cost and photos.

It bolts right in to stock location? Great, so some motor mounts and what cross member?

Sorry just wanting to do this to my 69 and don't want to reinvent wheel when you have done it and have the bugs worked out.

Thank you so much...
JC
 
Discussion starter · #31 ·
some update pics

This is the Dirty Dingo Slide Mount. Allows you to adjust the engine to any location from, 1/2" back to 2 1/2 " forward.

I'm using the SB Bell housing/scattershield that was on the 355 along with the McLeod Flywheel that is machined to work with it. I measured the engine mount on the SB and set the LS swap mount so the bell will be in the exact same location in the car as it was with the SB. This will bring the shifter up is the same location as well as no changes to the crossmember or driveshaft.

The mount will let me adjust slightly if I need to for header or other clearance. So if I need a 1/4" either way it's easy to do.

I'll be test fitting the engine into the car next to check all clearances.

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Installed the front accessory package. GM without AC and the Holley AC Bracket that accepts the Sanden AC Compressor that was on the 355. The Holley Bracket is cast and looks like GM Factory

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The Oil Pan is GM "Muscle Car" which is actually the Hummer H3 Pan. The Engine came with a Corvette Pan

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Dynatech Headers

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Discussion starter · #33 ·
130fe said:
John, told you the Holley bracket was a nice piece. Give me a call when you get a chance.
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It's nice for this build although by the time you buy the required install kit it does cost more the Kwik or Dingo which I also like
 
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Discussion starter · #34 ·
Had a great day yesterday.

Started off with a spirited drive in my car for inspiration then a test fit of the LS3.

Car had the 350 frame towers. (1 /1/2" frame to bolt hole center) These were too low and the pan was on the cross member.

I had anticipated this possibility and had a set of 307/327 frame mounts (2" frame to center of hole).

Set the motor in and good clearance all the way. about 1/4" pan to cross member.

The Dynatech headers have very good clearance. I'll post some pics later. I set the motor in the stock position so that the shifter, tranny cross drive shaft etc and go back as it was with the 355.

The engine could be moved 2" forward if a guy wanted too and the headers would still clear easily.

The headers hang a little lower then the Hooker Procomps we have on our other 2 LS 69s. When I install the tranny and tranny cross the rear will come up a little and we will have about 6" ground clearance. Car has 2" drop Hotctkiss on it.

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#36 ·
What is the ground clearance going to be when it's on the ground?
Ron
 
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#39 ·
I would like to see you make a YouTube video of the rest of your work. Just a suggestion, looks like a wonderful project to be working on. I think it would be a blast to put an LS3 in my 67 RS convertible. I am looking forward to seeing your itemized parts & price list showing a first hand cost account. :)
 
Discussion starter · #40 ·
327!275hp!Convt! said:
I would like to see you make a YouTube video of the rest of your work. Just a suggestion, looks like a wonderful project to be working on. I think it would be a blast to put an LS3 in my 67 RS convertible. I am looking forward to seeing your itemized parts & price list showing a first hand cost account. :)
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Good idea. We'll do some video.

I'll have some time today probably to post a parts list.

The new EFI Fuel tank from Tanks Inc. was delivered Friday. You can do an inline pump but they are noisy and more prone to failures. Tank looks great and installs with the same tank straps.

I use the C5 Corvette Fuel filter/pressure regulator mounted close to the fuel tank. It returns fuel to the tank before it runs to the engine bay so the fuel does not get heated. Makes for a neat installation and only cost about $40.
 
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Vega$69
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