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Old 12-25-2012, 09:52 PM   #1
Doug-04PBM
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Another head swap thread

Start out with current mods... Headers, exhaust, svede, tune.

Was gonna buy some v710s to get bigger tires in the back and do the head install this summer but I found a nice deal on some LS6 243's with the sodium valves. I was going to wait and do everything with a cam but I don't want to run a cam on a mail order tune so it will have to wait.

While I'm in there I figured I should go with the following. (Help me here)
ARP head bolts
Replace all Gaskets
Ls7 lifters
Lifter trays
SLP UDP(should I do it now or wait for cam?)
Anything else? Car is a weekend toy now so a staggered setup can wait.
I should see 20-25 horsepower right?


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Old 12-26-2012, 03:01 AM   #2
87LC2
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Save the UDP for the cam swap.

You should easily pick up 20hp. The increased compression with improved flow of the new heads will make more power, and the lightweight hollow stem intake valve should allow the engine rev a little quicker and higher.
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Old 12-26-2012, 07:22 AM   #3
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Yup, what 87 said, skip the UDP for now.

Personally, if your going to do a cam swap down the line, and depending on how big you go, I'd hold off on the swap. Those heads will have a significant benefit from porting. I have had a set of 243's sitting on a shelf for the last 4 months, but I'm saving to port them and do an intake swap at the same time.
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Old 12-26-2012, 08:14 AM   #4
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You have to replace the head gaskets when swapping. You have to replace the head bolts, as well.

There is nothing much else to do unless you want to upgrade the valve springs while the heads are off the car.
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Old 12-26-2012, 08:30 AM   #5
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I've read that ls6 springs are good up to .600 of lift. Is this correct?


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Old 12-26-2012, 08:40 AM   #6
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Quote:
Originally Posted by Doug-04PBM...View Post
I've read that ls6 springs are good up to .600 of lift. Is this correct?


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No.
They max out at 0.570" lift, I wouldn't go much over 0.550"-0.560".
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Old 12-26-2012, 09:13 AM   #7
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They also won't handle aggressive cam lobes very well, either.
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Old 12-26-2012, 09:42 AM   #8
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Glad I asked lol. I think I'm going to leave the springs stock for now. My plans are a baby cam but I can see me changing my mind and going with a more aggressive cam setup since my car isn't a DD anymore. Is the ls1howto guide a pretty good source to go off of?


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Old 12-26-2012, 09:55 AM   #9
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Yes, the LS1 How-To guide is what I used. Cleaning the coolant and crude from the head bolt holes plus cleaning the mounting surfaces are both time consuming and critical. Add antifreeze to your list and you should change the oil/filter afterwards too.
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Old 12-26-2012, 10:24 AM   #10
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If you are getting the heads for a good deal then i would wait until you have money to port them. And don't go with a baby cam if this isn't your dd. Get a good medium range cam, install everything at once, and get a proper tune. You will save money in the long run if you are patient.
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Old 12-26-2012, 12:30 PM   #11
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GMHTP has a write-up on porting in the current issue to get you started
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Old 12-26-2012, 01:50 PM   #12
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I'd be concerned about running a head swap without a tune especially if you have a mail order tune that more than likely leaned fueling and bumped up timing
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Old 12-26-2012, 02:17 PM   #13
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It's one of the diablew tunes where you data log and send him the files and he adjusts according. I figured those are better than normal mail order tunes. He has a pretty good reputation and did an excellent job on my current setup.


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Old 12-26-2012, 02:17 PM   #14
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And it's not just one and done.. He likes to adjust the tune 4-5 times to make sure he gets it as good as possible. I figured this would be safe.


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Old 12-26-2012, 02:20 PM   #15
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Would this be sufficient?


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Old 12-26-2012, 02:42 PM   #16
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It may (or not) be perfect for what you have now. Performance tuning leans out fueling and increases timing from the stock calibration but a head swap will increase compression and that usually requires less timing as well as the increased air flow affecting WOT fueling. Maybe it's just me. . .
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Old 12-26-2012, 02:49 PM   #17
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I hope it will be sufficient. Everyone has told me he knows his stuff. I understand where you are coming from though. I just spoke to him and he gave me the go ahead. Am I missing anything else on my swap?


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