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LS1 to LS3 swap, couple questions

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Old 04-30-2013, 10:10 AM
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Talked to Racetronix, that harness will work because LS1/2/7 use a Delphi plug and the LS3 uses a Bosch plug, and I'm using a LS1 sensor.
I did pull the plug out of the back of my intake, guess I can always put a rubber plug in if I don't need it. I don't have HVAC anymore, maybe I don't need that to read the MAP?
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Old 04-30-2013, 11:40 AM
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Originally Posted by Tyler Wilson
I do have the correct valley cover, I purchased that along with the LS3 intake together.
Knock sensors, yes, the block is drilled and tapped and I have the harness to put them on both sides of the block.
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Which Valley cover are you using, LS3?
I assume it doesn't have provisions for KS?
If an LS6 cover is used with KS, does the LS3 intake hit them?
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Old 04-30-2013, 01:10 PM
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Originally Posted by 95wannabe
Which Valley cover are you using, LS3?
I assume it doesn't have provisions for KS?
If an LS6 cover is used with KS, does the LS3 intake hit them?
I bought a used factory take off LS3 intake w/valley cover from a guy that put a supercharger on a 2010 camaro.
I don't know what you mean "KS"?
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Old 04-30-2013, 01:54 PM
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Knock Sensors go on the side of the block..I would tap them out to M10x1.5 and use your current Knock Sensors.

It's a shame how much they charge for that wiring..something so simple.
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Old 04-30-2013, 02:07 PM
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Ahh! KS = Knock Sensors!
Yes, my block is drilled and tapped and the sensors are in there already.
Used this harness with my LS1 knock sensors:
http://www.racetronix.biz/itemdesc.a...2-KSRH&eq=&Tp=

Used this thread to see where to drill and tap:

https://ls1tech.com/forums/generatio...-f-body-3.html

95wannabe, go to post #59 and see the pic.
Use the "Normal" hole to drill and tap.
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Old 04-30-2013, 07:42 PM
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ok thanks for the link/pic of where to drill.
I'm only using LS3 topend on an LQ4, so it looks I need LS3 valley cover instead of the LS6.
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Old 04-30-2013, 08:08 PM
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Originally Posted by 95wannabe
I'm only using LS3 topend on an LQ4, so it looks I need LS3 valley cover instead of the LS6.
NO, use the LS6. It's a Gen III Block.
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Old 04-30-2013, 08:26 PM
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ok, so the KS wont interfere with the LS3 intake?
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Old 04-30-2013, 08:29 PM
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No. Just try bolting that LS3 Valley Cover to a Gen III Block...
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Old 05-01-2013, 05:45 AM
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I thought they looked different in all my searching about this issue.
Thanks Merv.
Sorry for the hijack Tyler.
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Old 05-01-2013, 05:31 PM
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Originally Posted by 95wannabe
I thought they looked different in all my searching about this issue.
Thanks Merv.
Sorry for the hijack Tyler.
Not a problem at all!
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Old 05-02-2013, 04:51 PM
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Originally Posted by Tyler Wilson
Yes, I am. Do I need to do this to back of my LS3 intake:

http://www.gmhightechperformance.com.../photo_15.html

Run a hose up to the front of my intake like this:

http://www.gmhightechperformance.com.../photo_33.html

Or, just put the map in the same place as the picture above shows and plug it in?

One more thing, my MAP sensor extension is this one:

http://www.racetronix.biz/itemdesc.a...2-MSEH&eq=&Tp=

I now notice it says it's for LS2 applications - will it still work with what I'm doing here?

Thanks
Does anyone know why they are doing what they are doing in the first 2 links with the map and the back of the intake?
Thanks
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Old 05-02-2013, 08:04 PM
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To get a Vacuum into the LS1 Map...making that one alot more complicated. The T should be at the back of the Intake so the wiring reaches.
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Old 05-02-2013, 08:12 PM
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Originally Posted by the_merv
To get a Vacuum into the LS1 Map...making that one alot more complicated. The T should be at the back of the Intake so the wiring reaches.
I have the map sensor extension harness, so I can get the wiring up there, right?
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Old 05-02-2013, 09:19 PM
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If you can get the LS1 Sensor to stay in the Intake, yes.
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Old 05-03-2013, 08:57 AM
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Originally Posted by the_merv
If you can get the LS1 Sensor to stay in the Intake, yes.
I can use some type of epoxy, right? Or doesn't that work well...
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Old 05-04-2013, 02:12 AM
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I saw a bracket for that onetime..
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