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ls3 piston to valve clearance

Old 01-25-2012, 08:07 PM
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Default ls3 piston to valve clearance

has anyone ran into piston to valve clearance problems with the ls3? ive been told that your kinda limited in terms of lift and duration when choosing a camshaft for this motor. my ls3 isnt exactly stock, has good rods and pistons in it, mahle forged flat tops with 4cc valve reliefs for the big ls3 intake valve, the deck has been cut about .003 to clean it up and the pistons come out above the deck .008 to .010. the heads have stock 70cc chambers, i dont think ill have any P/V clearance issues due to the big valve reliefs in the pistons. gimmie some input on this.
Old 01-25-2012, 10:25 PM
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You probably have a good bit to work with, but need to know your cam profile.
Old 01-25-2012, 10:40 PM
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Very vague details....
Old 01-25-2012, 11:53 PM
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Originally Posted by ls-won-84c10
has anyone ran into piston to valve clearance problems with the ls3? ive been told that your kinda limited in terms of lift and duration when choosing a camshaft for this motor. my ls3 isnt exactly stock, has good rods and pistons in it, mahle forged flat tops with 4cc valve reliefs for the big ls3 intake valve, the deck has been cut about .003 to clean it up and the pistons come out above the deck .008 to .010. the heads have stock 70cc chambers, i dont think ill have any P/V clearance issues due to the big valve reliefs in the pistons. gimmie some input on this.
at the end of the day you need to check if you have clearance or not

everything needs to be taken in

the pistons stick out

what gasket are you using

what is the cam profile

you just need to check

rule of thumb for the industry is 80 thou intake 100 thou exhaust

^^^ but everyone is different on what is tight or not-

CHECK
Old 01-26-2012, 01:04 AM
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post some cam info.
Old 01-26-2012, 07:23 AM
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your valve reliefs will allow for significantly more cam duration than a stock LS3 with flat top pistons.
Old 01-26-2012, 07:39 AM
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Default cam specs

i havent bought a camshaft yet, i dont think i should buy one until i figure out what i can get away with, there are bound to be some sort of baseline numbers to go by.
Old 01-26-2012, 10:19 AM
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Originally Posted by ls-won-84c10
i havent bought a camshaft yet, i dont think i should buy one until i figure out what i can get away with, there are bound to be some sort of baseline numbers to go by.
Have pat g spec you a cam. He can take all your build info, your goals and spec it out based on those things. $25 well spent imo
Old 01-26-2012, 09:32 PM
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Default pat g

Originally Posted by Tainted
Have pat g spec you a cam. He can take all your build info, your goals and spec it out based on those things. $25 well spent imo
how do i get in touch with pat G?
Old 01-26-2012, 09:44 PM
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Just search his name and he has a link to his site in his signature.
Old 01-26-2012, 10:03 PM
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Shazam

http://www.engpwrsys.com/index.php?a...&productId=216


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