PushRod Lenght
01-11-2010, 04:52 AM
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PushRod Lenght so i bought a 2004 LS6 cam from a member here for my LS1.
GM says LS1 cam is 19.7mm base circle (im guessing that's diameter?) and the LS6 cam is 19mm base circle, so that's a 0.35mm diff in radius right?
0.35mm = 0.0138", stock push-rod is 7.4" so i should get one that's 7.4138 right?
I know they don't make a 7.4138 one i just wanna make sure my thinking is correct, so then i should get whatever closest which would be the 7.425" rods ??
so i should order yellow LS6 springs and 7.425 rods ?
GM says LS1 cam is 19.7mm base circle (im guessing that's diameter?) and the LS6 cam is 19mm base circle, so that's a 0.35mm diff in radius right?
0.35mm = 0.0138", stock push-rod is 7.4" so i should get one that's 7.4138 right?
I know they don't make a 7.4138 one i just wanna make sure my thinking is correct, so then i should get whatever closest which would be the 7.425" rods ??
so i should order yellow LS6 springs and 7.425 rods ?
Last edited by Klubba; 01-11-2010 at 04:59 AM.
01-11-2010, 05:04 AM
#2
From what I have measured, stock length is 7.385" gauge length. On the LS6, the difference in base circle is made up by slightly taller valves. I think the 7.400" pushrods would be a better length although a better approach would be to measure. As for the valve springs, the PAC 1215 which has a slightly higher seat value. The yellow springs have broke on quite a few guys and the PAC springs are excellent.
01-11-2010, 05:28 AM
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From what I have measured, stock length is 7.385" gauge length. On the LS6, the difference in base circle is made up by slightly taller valves. I think the 7.400" pushrods would be a better length although a better approach would be to measure. As for the valve springs, the PAC 1215 which has a slightly higher seat value. The yellow springs have broke on quite a few guys and the PAC springs are excellent.
Maybe 7.4 would be a better choice then.
as for the springs i thought the yellow ls6 would be great since there made specifically for that cam, also i want stock reliability and fuel economy which is why i went with the LS6 cam.
The problem with yellow springs breaking, have this happened on stock engines (LS6 cam) or is it only on cammed vettes with big cams?
01-11-2010, 11:11 AM
#4
No, yellows have failed on stock engines. That is why I would recommend the PAC. The 1215 isn't as stiff as the 1218 but it is a little stiffer then the yellow spring so you won't be adding a lot of spring stiffness for no reason. The PAC's have a very long life as well.