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99 LS1 Push Rod Question

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Old Jan 9, 2009 | 10:34 AM
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Default 99 LS1 Push Rod Question
I have a 99 Z28, swapping to a LS6 Cam shaft and Springs.

Since I am swapping heads as well - I figured upgrading the pushrods would be nice since I am going FI.

My question is - What size pushrods would I need? It looks like both LS1 and LS6 require the 7.400" Pushrods. Can anyone confirm? And also what width would I need? I saw 5/16" and I think 3/8".. Thanks!
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Old Jan 9, 2009 | 11:16 AM
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As long as your heads are not milled you should be able to use the 7.400" length, and 5/16" is the correct width for the LS1s.
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Old Jan 9, 2009 | 11:39 AM
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Thank you!
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Old Jan 9, 2009 | 12:20 PM
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I believe that the base circle on the LS6 cam is slightly smaller compared to the LS1 cam. Might want to investigate further. 7.425" might be your better choice, as it will likely reduce the valvetrain noise. Check before you order.
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Old Jan 9, 2009 | 12:39 PM
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To clarify - i am installing unmilled 317 heads.
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Old Jan 9, 2009 | 01:18 PM
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Yes the Base circle of the Ls6 cam is smaller so you should need a LONGER pushrod!
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Old Jan 9, 2009 | 01:21 PM
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So the best choice is in fact 7.425"?

Just wanted to get more feedback before I order.
Thanks
Last edited by sujomatt; Jan 9, 2009 at 03:41 PM.
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Old Jan 9, 2009 | 03:48 PM
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Originally Posted by litle88
Yes the Base circle of the Ls6 cam is smaller so you should need a LONGER pushrod!
Yeah. And as always, you should use an adjustable pushrod to verify the valve train geometry, don't guess.
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Old Jan 10, 2009 | 12:01 PM
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ty all
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Old Jan 10, 2009 | 01:13 PM
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Originally Posted by litle88
Yes the Base circle of the Ls6 cam is smaller so you should need a LONGER pushrod!
agreed, i think most are the same. 7.4s tend to be a bit noisier and 7.425s seem to be quieter from what i have read.
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Old Jan 14, 2009 | 10:50 AM
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awesome, will b ordering those 7.425" pushrods. Thanks!
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Old Jan 21, 2009 | 11:28 AM
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BUMP - forgot to tell you all that i am going to be using 317 Heads... What length with those? Any difference??? Thanks..
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