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LS2 to LS1 swap "0"-ring question

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Old Aug 7, 2007 | 08:43 PM
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Default LS2 to LS1 swap "0"-ring question

Is the injector "o"-ring port (bung) on an LS2 intake manifold the same size as on an LS1 intake manifold? Need to know if it takes the same size "o"-ring.
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Old Aug 7, 2007 | 09:17 PM
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I'm pretty sure thats a big NO... but I could be wrong, I read something about that.
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Old Aug 7, 2007 | 10:23 PM
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Originally Posted by jmdale1984
I'm pretty sure thats a big NO... but I could be wrong, I read something about that.
Yeah, I can't seem to be able to find an answer. Everything for the swap has been worked out except confirming the o.d. size for the "o"-ring that fits into the LS2 manifold. Some places say it's the same, others claim it's different. The manifold should be here within a couple of days & I was hoping to order the "o"-rings in advance. Injectors are Accel 30#.
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Old Aug 7, 2007 | 10:32 PM
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Sorry I can't be more help... but there are plenty of people here that should know this one. I'm just a guy with a tired LS1. All this LS2/3/6/7 stuff is just a fantasy world to me... lol.
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Old Aug 8, 2007 | 01:48 AM
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The LS2's are a little bigger. The Rails are different also..I would of bought a set of LS2 Injectors..they are 34lb/hr.
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Old Aug 8, 2007 | 05:48 AM
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Originally Posted by LS1-450
Is the injector "o"-ring port (bung) on an LS2 intake manifold the same size as on an LS1 intake manifold? Need to know if it takes the same size "o"-ring.
The injector bores are larger on the LS2 than the LS1 intake.
Also the outside diameter of LS2 injectors is slightly larger than LS1 injectors.

So if you put LS2 O rings onto LS1 injectors....and then put them into an LS2 manifold.
a) Outside of LS2 O ring will fit nicely in the bore of LS2 manifold......but
b) Inside of LS2 O ring will be too sloppy on LS1 injector.

SOLUTION: http://www.katechengines.com/street_...tail.php?id=35
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Old Aug 8, 2007 | 09:20 AM
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Originally Posted by HSV-GTS-300
The injector bores are larger on the LS2 than the LS1 intake.
Also the outside diameter of LS2 injectors is slightly larger than LS1 injectors.

So if you put LS2 O rings onto LS1 injectors....and then put them into an LS2 manifold.
a) Outside of LS2 O ring will fit nicely in the bore of LS2 manifold......but
b) Inside of LS2 O ring will be too sloppy on LS1 injector.

SOLUTION: http://www.katechengines.com/street_...tail.php?id=35

Thanks for the information. Greatly appreciated........ & thanks to everyone else who commented as well. The best thing about LS1TECH is that the help one offers others comes back to us ten fold when we need it.
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Old Aug 8, 2007 | 04:38 PM
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Those aluminium spacers and longer bolts will also help if you need to lift up the LS2 fuel rail to allow for the extra height of LS1 style injectors.

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