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View Poll Results: Which should I do
Buy stiffer springs and keep the cam
77.78%
Buy a smaller "Turbo cam"
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Valvetrain Question

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Old Jun 14, 2009 | 08:29 PM
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Default Valvetrain Question

I am 99% sure I am floating the valves about 6000rpm.
My current cam spec is 239*/233* .639"/.629" 115lsa

Should I buy stiffer springs rated to .660 lift like some Extremes or buy a new cam like a TU1, TU2, LS6 or something with a lot less lift.
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Old Jun 15, 2009 | 08:53 AM
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Go for the stiffer springs
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Old Jun 15, 2009 | 06:29 PM
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Stiffer spring and Yella Terra Ultra Lights..
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Old Jun 15, 2009 | 08:09 PM
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stiffer springs mosdef
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Old Jun 15, 2009 | 09:15 PM
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What boost psi are you at when u think its valve float? I have almost same set up but supercharged with Yella Terra Ultra Lights What springs do u have now ? how old are they?
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Old Jun 15, 2009 | 10:04 PM
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11psi is when it starts. I have Manley springs rated to .650 with stock rockers. The springs may have 1500miles on them.
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Old Jun 15, 2009 | 10:22 PM
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If your springs are insufficient a smaller cam is not going to help you. What pressure are they set up at?

With your cubes/turbo I would like to see no less than 175-185lbs on the seat.
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Old Jun 15, 2009 | 10:35 PM
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Originally Posted by INTMD8
If your springs are insufficient a smaller cam is not going to help you. What pressure are they set up at?

With your cubes/turbo I would like to see no less than 175-185lbs on the seat.
I don't know what the pressure is LME put the motor together I just put it in. I was thinking having that much lift is was the main problem.
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Old Jun 16, 2009 | 09:05 AM
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The lift on the cam is not a problem. Give me a call or PM with your name and I can look up what the spring pressures are. Did we install the heads on the engine?

Thanks,
Bryan
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Old Jun 16, 2009 | 04:37 PM
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I pulled the springs off number 1 and 3. Going to LME tomorrow to have them checked. I dropped a valve into the cylinder while doing it. Looks like I get to pull the head now.
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Old Jun 16, 2009 | 07:12 PM
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That stinks.
Could you sneak a thin pen magnet down the guide to catch the valve, or was the piston low enough to let the valve fall all the way out of the guide?
I like to have the piston near TDC before pulling springs to avoid this scenario.
Did you use an air line to pressurize the cylinder before removing the springs?
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Old Jun 16, 2009 | 08:27 PM
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I though it was on the piston because the keepers let go. I was wrong it was at BDC...lol. The head is off now going to Houston tomorrow.
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Old Jun 17, 2009 | 10:44 PM
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I got the springs looked at. They are 160lbs of seat pressure. LME and LMR said that was enough. There ideas where possibly blowing out the spark (tr7 gapped at .032") or a back pressure issue. But they said the cam and springs are fine. I am going to put the car back together tomorrow minus the intake(going to sell it).
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Old Apr 6, 2010 | 07:28 PM
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Bump.... I forgot about this and almost made a new one. Money got tight for a few months and I never changed the springs. What springs are yall using to achieve 175-185 seat pressure?
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