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03-17-2014, 04:43 PM
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#1 |
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Registered User
Join Date: Feb 2014
Location: Vancouver, Wa
Posts: 21
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Piston Slap?
Ok so when I bought the truck, on a cold start it has a clanking sound much like a sloppy piston, once it is started and running say for 5-10 seconds its gone. Original owner told me that the 454 was notorious for the famed piston slap. Having only had 305-350 SBC I am completely ignorant to the 454. Motor runs great, fires right up, oil pressure is great. Can anyone shed some light on if I should be concerned or this is normal when the truck sits and piston temp is cold.
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1985 Silverado C20 454 Gas Hog 74K miles no crust! 
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03-17-2014, 05:18 PM
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#2 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Piston Slap?
I don't know that I would say that it's a big block thing, but it more likely because of forged pistons. They have a bit more clearence when cold and expand more with heat, so they can make some noise at start-up, then quiet down as they warm up.
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You can review the site's rules here. Quote:
Bad planning on your part does not necessarily constitute an instant emergency on my part.... The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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03-17-2014, 05:46 PM
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#3 |
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Registered User
Join Date: Feb 2014
Location: Vancouver, Wa
Posts: 21
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Re: Piston Slap?
Thats what I gathered and it sure seems to be the case. I had just never heard this in any of my other chevy trucks. so shocked you could say i was when i heard it. when you hear a noise like that you heart sinks and you fear the worst.
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1985 Silverado C20 454 Gas Hog 74K miles no crust!
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03-17-2014, 05:46 PM
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#4 |
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Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: Piston Slap?
Sticky wrist pins will also cause a similar sound. Just warm it up before you load it and it'll live a long time.
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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03-17-2014, 05:50 PM
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#5 |
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Registered User
Join Date: Feb 2014
Location: Vancouver, Wa
Posts: 21
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Re: Piston Slap?
I have done that with all my rigs, i let them warm up some before hitting the road. this sound is much larger then a wrist pin, it sounds like the famous diesel sound for the quick few moments.
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1985 Silverado C20 454 Gas Hog 74K miles no crust!
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