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09-27-2007, 05:28 PM
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#1 |
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Putting clay on piston to check valve clearance.
Can I use clay to check my valve clearance? Anyone recommend this?
Open to opinions s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. 
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09-27-2007, 05:30 PM
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#2 |
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Senior Member
Join Date: Feb 2005
Location: Maynardville, Tn
Posts: 3,030
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Re: Putting clay on piston to check valve clearance.
Engine builders been doing it a long time.
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SEMA Network- Protect our Hobby! 71 C30 in pieces, starting to come together. Click here for A Place For Tennessee Truck Enthusiest To Meet |
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09-27-2007, 05:30 PM
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#3 |
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Registered User
Join Date: Aug 2007
Location: greenville,ms.
Posts: 47
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Re: Putting clay on piston to check valve clearance.
yes just measure the depth of the clay where it is compressed.
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09-27-2007, 05:57 PM
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#4 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Putting clay on piston to check valve clearance.
i always used silley putty
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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09-27-2007, 06:05 PM
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#5 |
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Registered User
 Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Putting clay on piston to check valve clearance.
unless you,ve got a hi-compression engine with a hi-lift cam you dont need to worry about it.
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I BELIEVE IN JOHN 3:16 |
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09-27-2007, 06:05 PM
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#6 | |
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Putting clay on piston to check valve clearance.
Quote:
s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.
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09-27-2007, 06:07 PM
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#7 | |
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Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Putting clay on piston to check valve clearance.
Quote:
s/t
__________________
1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.
Last edited by Sport/Truck; 09-27-2007 at 06:08 PM. |
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09-27-2007, 06:26 PM
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#8 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: Putting clay on piston to check valve clearance.
yes be better be safe then sorry
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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09-27-2007, 09:22 PM
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#9 |
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Account Suspended
Join Date: Sep 2005
Location: Monroe, WA
Posts: 3,814
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Re: Putting clay on piston to check valve clearance.
IMHO it's worth doing all of the clearance checks just to learn how to do them...and good insurance besides.
Last edited by Billla; 09-27-2007 at 09:22 PM. |
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09-27-2007, 10:43 PM
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#10 |
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Registered User
Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Putting clay on piston to check valve clearance.
you,ll have alot of clearence with 10-1 and that small of amount of lift cam. now if your going to 550 lift and more with thin head gaskets and cutting your heads down to 58cc,s or lower then thats another issue. and that cam is hydraulic lifter cam too right ? that opens up another can of worms. and i,am sure your not going to run it so hard you,ll float the valve train. your thinkin hard core racin measurements. also your not running dome pistons are you ?
bob
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I BELIEVE IN JOHN 3:16 |
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09-27-2007, 10:44 PM
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#11 |
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"Trucks with Class"
 
Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,158
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Re: Putting clay on piston to check valve clearance.
A light valve spring and dial indicator is a much better way to do the checking. You can keep checking the clearance at the rocker arm every 10 degrees as you rotate the engine, with all of the valve train angles and if you have close clearances, you will know exactly where it is tight...in/ex///opening or closing.
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09-27-2007, 11:44 PM
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#12 |
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Registered User
Join Date: May 2006
Location: Colorado
Posts: 412
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Re: Putting clay on piston to check valve clearance.
I would check it. Longer duration has a lot to do with it too, not just lift. The piston chases the exhaust valve. If the valve is hanging open for a while, the piston will catch it. Not good. I use the checking valve springs like PICKMUP suggested. I just push down on the rocker while rotating the crank over (by hand) until the piston contacts the valve. I continue until the piston pushes the rocker up to max lift. Then I use a dial indicator to verify clearance. Once the dial indicator is set up, I rotate the crank back and then forward to find the minimum clearance.
Last edited by dirtball; 09-28-2007 at 11:59 PM. |
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