I had an aluminum block with forged pistons and full floating wristpins on a built engine and it would slap for 2 minutes,but when warmed up, it was ON!
its mainly the valvetrain not being warmed up and you do have to match oil viscositys to quiet it down but just let it warm up before driving it because of the aluminum and it should be fine.
Sounds like your oil filter is letting the oil draining out of the valve lifters when shut off. Get a high quality oil filter with an anti drain back valve that works.
Sounds like piston slap to me. I have a 2005 GTO, and it very rarely makes any noise. It has to be extremely cold outside for mine to slap any. My 2000 Silverado was terrible about it in the winter time though. I found running Castrol 0W-30 in the cold months was much thinner, and made the noise go away. Id try running a thinner oil. It will help some. Either way, its nothing to worry about.
near the end of the video i can hear some valve train/ lifter noise... Mine does that too (ls2 06gto)...and my vortec 6000 truck does it too (6 litre lq4)
could be your hydraulic lifters...get sme one to check that. PROMA MBL8 Lifter Additive might help. thats what i did & what i thought was piston slap was just no oil in the hydraulic lifters on start up. if the noise still continues when up to heat, then u should replace the hydraulic lifters.
Am I the only one who didn't hear anything?
ETAZMT 3 months ago
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I had an aluminum block with forged pistons and full floating wristpins on a built engine and it would slap for 2 minutes,but when warmed up, it was ON!
xsmokedoutx 4 months ago
Comment removed
xsmokedoutx 4 months ago
its mainly the valvetrain not being warmed up and you do have to match oil viscositys to quiet it down but just let it warm up before driving it because of the aluminum and it should be fine.
77hawkvette 1 year ago
What did u end up finding out? I got a similar sound in my 06 GTO. Please PM me. Thanks
ramzizaz 1 year ago
Sounds like your oil filter is letting the oil draining out of the valve lifters when shut off. Get a high quality oil filter with an anti drain back valve that works.
ireload2 1 year ago
Sounds Strange but this is what i did for my 01 tahoe and it helped. run 93 octane gas.
2001tahoedriver 1 year ago
Sounds like piston slap to me. I have a 2005 GTO, and it very rarely makes any noise. It has to be extremely cold outside for mine to slap any. My 2000 Silverado was terrible about it in the winter time though. I found running Castrol 0W-30 in the cold months was much thinner, and made the noise go away. Id try running a thinner oil. It will help some. Either way, its nothing to worry about.
billybob750 2 years ago
It's a cold all-aluminum motor. It's a fact of life.
jimbo98z 2 years ago
i just started hearing the same noise in my 2005 gto, if you resolved the issue, any info would be greatly appreciated, message if u wish
joneseyy21 2 years ago
near the end of the video i can hear some valve train/ lifter noise... Mine does that too (ls2 06gto)...and my vortec 6000 truck does it too (6 litre lq4)
leeanator 3 years ago
@leeanator ls motors are notorious for the sewing machine noise
seanparker32 1 year ago
sounds like rod noise
DrCadillacV 3 years ago
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could be your hydraulic lifters...get sme one to check that. PROMA MBL8 Lifter Additive might help. thats what i did & what i thought was piston slap was just no oil in the hydraulic lifters on start up. if the noise still continues when up to heat, then u should replace the hydraulic lifters.
duncanisgod 3 years ago