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View Poll Results: Should I buy the Crossover kit?
Yes - buy the kit
33.33%
No - save the money and shave down the ribs
66.67%
Voters: 12. You may not vote on this poll

LS6 Crossover kit

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Old 06-22-2008, 11:33 AM
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Default LS6 Crossover kit

Is it worth it to spend the $45 bucks to get the coolant line kit, or is it just as easy to shave the ribs and slightly flatten out the stock lines?

What are your guys experiences with this?
Any problems with not installing it?
Problems with installing it?
Old 06-22-2008, 12:42 PM
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I voted to shave the intake to re-use the stock line.You can't get any cheaper than free.
Old 06-22-2008, 01:48 PM
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you also keep coolant flowing thru the rear cylinders using the ls1 lines....i think that helps with the probs some have with 7/8
Old 06-22-2008, 02:06 PM
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i also voted to shave the ribs. i have had no issues and didn't want to shell out money for the crossover kit then find my 7 + 8 cyls being to hott.
Old 06-22-2008, 04:00 PM
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I don't understand. Help computa.
Old 06-22-2008, 06:44 PM
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sorry to break in and ask a different question but are the ls6 crossover lines needed for a fast 90 manifold?
Old 06-22-2008, 06:54 PM
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I noticed that my car used to stay cooler before I swapped out to the ls6 intake years ago.so thats why my car runs hotter than it used to anyone else have the same thing happen to them after the ls6 coolant lines installed.I have the same question will the ls1 lines work with the fast 90 intake.
Old 06-22-2008, 08:30 PM
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thanks guys. I hope more answers from guys with experience will help others too. It seemed like spending 45 bucks, and also losing the direct coolant flow to the rear of the block just didn't make sense to me.
Old 06-22-2008, 09:02 PM
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i just did the LS6 coolent lines cause i got them with the intake, havnt had any problems with the car running hot at all? i think it runs even better.
Old 06-23-2008, 08:55 AM
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I just did a Fast 92 combo install and I had to change the coolant crossover lines to the ls6 style. I haven't noticed the car running any hotter.
Old 06-23-2008, 10:59 AM
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Personally, I'd rather not shave my ls6 intake so I just spent the 45 bucks or whatever it was, It cleans it up under there and does not run any hotter
Old 09-09-2011, 10:04 PM
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Anyone have pics of what needs to be 'shaved?'
Old 09-10-2011, 12:06 AM
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Quoted word for word,

from the book "How To Build High-Performance Chevy LS1/LS6 V8's"
by Will Handzell (GMPP) Cartech Books.

Page 49.
"Some road racers have been using the pre-LS6 steam tubes underneath the LS6 intake to improve cooling in cylinder number 7 (they previously had detonation problems in that hole). While the steam tubes weren't used on factory LS6s, they will fit under the intake by slightly grinding down some of the stiffening ribs on the bottom side."

If there's any doubt, there's no doubt.

Last edited by Sid447; 09-10-2011 at 12:48 AM.
Old 09-10-2011, 12:32 AM
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get .... 2 .......LS6 steam tubes......shave ribs.......and get a LS6 valley cover too.......nuff sed
Old 09-10-2011, 05:39 AM
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shave the ribs, you dont even have to shave them all, just the parts that interfere. i used a set of pliers and snappped them all off in about 5 mins. the intake dropped right in after that.i used the 45 bucks to buy new intake gaskets. the best part is, no coolant splashing onto the driveway.
Old 09-10-2011, 12:25 PM
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I just took almost all the rids off, no issues. I still have the LS1 lines
Old 09-10-2011, 01:40 PM
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When I put my LS6 intake on I shaved the ribs on the bottom and used the LS1 steam tube. When I went to the FAST intake I bought two LS6 steam tubes and hooked them together.
Old 09-11-2011, 05:10 PM
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What does the two ls6 tubes connected look like?



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