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Generation III Internal Engine 1997-2006 LS1 | LS6
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1.8 rockers with a hot cam

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Old Oct 18, 2004 | 07:32 PM
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Default 1.8 rockers with a hot cam
Can pick up a set of Harland Sharp 1.8's really cheap, anyone see a problem with the 02 Ls-6 springs handling this.
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Old Oct 18, 2004 | 07:39 PM
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I'm not exactley sure what the HS 1.8's would bump your lift to, but I would go ahead & add some 918's just to be on the safe side.


Mike.
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Old Oct 18, 2004 | 07:47 PM
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I was trying to avoid a spring change, I come up with .556 on the lift.
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Old Oct 18, 2004 | 07:48 PM
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1.8 rockers will put you at about .555 lift, a little above what the LS6 springs are rated for (.550). I wouldn't risk it, just get a good set of springs or you may be sorry later...
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Old Oct 18, 2004 | 08:07 PM
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Originally Posted by Jancarich
1.8 rockers will put you at about .555 lift, a little above what the LS6 springs are rated for (.550).
Umm.........the valve lift of the 2002+ LS6 cam is .551/.547. The valve lift of the cam does not equal the valve spring rating. Those valve springs have are rated to .575" so you'll be fine with the .556 valve lift your 1.8 rockers will give you.
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Old Oct 18, 2004 | 08:28 PM
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I stand corrected... Texas speed and Pace must be wrong too then when they rate that spring at .550 I still say change the springs with some that are rated higher for the extra lift the 1.8 rockers are going to give you. I guess I'm a little paranoid having lost one engine and not wanting to lose another...
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Old Oct 18, 2004 | 08:58 PM
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Thanks guys
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Old Oct 18, 2004 | 09:19 PM
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Default 1.8 with hot cam
I have 1.8 jessels with hot cam and O2 LS6 heads. I think MTI or MMS also state the max lift of O2 LS6 springs at .575 lift.
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Old Oct 18, 2004 | 09:52 PM
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918's and you dont even have to think about it.
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Old Oct 19, 2004 | 07:33 AM
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Originally Posted by Jancarich
I stand corrected... Texas speed and Pace must be wrong too then when they rate that spring at .550 I still say change the springs with some that are rated higher for the extra lift the 1.8 rockers are going to give you. I guess I'm a little paranoid having lost one engine and not wanting to lose another...
That may be the 2001 LS6 valve springs they/you are referring to. Also, I agree with you 100% as personally, I'd get stouter springs. However, the quesion was simply, "Can you do it?"
Last edited by XTrooper; Oct 19, 2004 at 07:41 AM.
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Old Oct 19, 2004 | 09:29 AM
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considering how much rockers are and how little increase in power you will get from them, i'd say say the money and get something else. maybe some suspension work!
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Old Oct 19, 2004 | 09:59 AM
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Just get a better cam.

Forget the rockers and swap out that notcam/twatcam.

One of our sponsors can hook you up with something that makes more power with better drivability.
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Old Oct 19, 2004 | 02:53 PM
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Tommy Tucker has the same set-up=Hot cam and 1.8 rockers.
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Old Oct 19, 2004 | 04:01 PM
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Originally Posted by FASTONE
Tommy Tucker has the same set-up=Hot cam and 1.8 rockers.
And how did it work out.
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Old Oct 19, 2004 | 09:50 PM
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My drivablity is fine it's all in the tune, I like this little cam, I put down 376 RWHP and 358 RWTQ this last saturday at a dyno day without even thinking about breaking any valve springs or when to check them, I will agree though I may just throw in some 918's to have peice of mind.
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