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Old 02-04-2013, 01:49 PM   #1
Doug-04PBM
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243 heads help

Looking to buy a set of 243's that have about 50k on them. They come with aftermarket valve springs, either yella terra or comp gold and they have about 34k on them. Would these be fine to run on my stock ls1 cam? And the heads are clean. Should I brake cleaner them then bolt them up?


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Old 02-04-2013, 02:17 PM   #2
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If your going to pull the engine down to install heads then you should also upgrade the cam/lifters while at it. As far as the heads being ready to bolt on after brake clean, it's up to you. I know if I was going to install heads, I would have them looked at by someone who would make sure they are clean, straight and read to bolt on.
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Old 02-04-2013, 02:57 PM   #3
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243 heads help

Forgot to mention I'm putting ls7 lifters and new trays in. Have to wait on cam install since there's no shop with a dyno remotely around me. Can have a custom tune for the heads. Just unsure about springs on these heads.


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Old 02-04-2013, 03:35 PM   #4
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Not that I have a lot of experience at this but will shortly as I'm doing a 243 build. While the heads are off you might as well have them looked at and cleaned up any reasonable shop will not charge an arm an leg for this. If I was you id buy a spring kit and comp cam spring tool and change them your self. And I have seen a couple dozen threads on here were ppl was running small cams for a few months period before a tune with no ill side effects. Atleast throw a gt2-3 in it something a little better.
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Old 02-04-2013, 03:41 PM   #5
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Quote:
Originally Posted by Doug-04PBM...View Post
Forgot to mention I'm putting ls7 lifters and new trays in. Have to wait on cam install since there's no shop with a dyno remotely around me. Can have a custom tune for the heads. Just unsure about springs on these heads.


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Old 02-04-2013, 03:54 PM   #6
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I would install new springs and since you're using the stock cam just get a set of ls6 springs.
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Old 02-04-2013, 03:56 PM   #7
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You need new gaskets and head bolts. Make sure you clean the gasket material of both the heads and the block. Use brake cleaner and razor blades. Be careful not to cut into the aluminum.

I would change the springs. You don't know what cam was run with those springs, and it could have had a very aggressive lobe profile.

If you aren't planning on changing your cam, I would just get some LS6 springs for the time being or transfer over your LS1 springs, and then get aftermarket springs when you decide to change out the camshaft.
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Old 02-04-2013, 04:10 PM   #8
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I have a set of Ls6 springs with 0 Miles if you are interested.

Last edited by RQSGTO; 02-04-2013 at 09:08 PM.
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Old 02-04-2013, 05:14 PM   #9
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don't you need the push rods to be a different length?

Last edited by countrytour; 02-04-2013 at 05:16 PM.
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Old 02-04-2013, 05:19 PM   #10
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don't you need the push rods to be a different length?

Not unless the heads have been milled
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Old 02-05-2013, 07:37 AM   #11
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243 heads help

Thanks for the replies. Ill clean them and replace the springs. Should be a nice 20 whp gain.


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Old 02-05-2013, 07:42 AM   #12
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Quote:
Originally Posted by high school goat...View Post
Not unless the heads have been milled

Always measure when changing heads. He will likely be fine, but it is so easy to measure.
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Old 02-05-2013, 08:21 AM   #13
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With 50K is also wouldn't hurt to replace the oil seals. If you have the springs out your right there anyway. I use the Crane spring Compressor and on a bench it's cake.
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