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#1 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
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Piston ring gap question
I am stock rebuilding a 4.8 to go in an 85 c10. Got the block back with new cam bearings and cleaned up cylinders. I got a set of standard rings which I assume are drop in. The specs say multiply .0040 time 1 inch of the borer the minimum so my question is have I figured correctly...
.0040 x 3.78 = .015 The specs do not specify any difference between the top and 2nd ring so I assume I should gap them the same? Any information/advice/suggestions will help. Thanks! |
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#2 | |
Registered User
Join Date: Mar 2017
Location: Edmonton
Posts: 369
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Re: Piston ring gap question
Quote:
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#3 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
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Re: Piston ring gap question
Got them from Clevite. I do plan to call them before I install just to make sure. Service manual specs have top ring .009-.017 and second ring .017-.027. I would be within spec on top ring but need to double check on the second ring. Thanks for you help!
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#4 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Piston ring gap question
That sounds a little narrow to me. I'd want to be 22-25 for safety on an LS motor, as they have been known to butt ring ends. I would WAY rather bleed some minuscule amount of cylinder pressure off than pop the top off a piston!
The fashion/trend on what to do with the second ring seems to change every 5 years, but right now I'm gapping them about the same as the top. http://www.wiseco.com/PDFs/Manuals/RingEndGap.pdf
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#5 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
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Re: Piston ring gap question
Thanks dave. According to that chart if I'm rebuilding stock then I should follow the chart for "late model stock" and gap .005 for top ring and .055 for second ring? Is this what you are recommending?
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#6 |
Registered User
Join Date: Jul 2016
Location: Brandon,MS
Posts: 489
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Re: Piston ring gap question
jrusher I called clevite and you are exactly on spec.
20-25 25-30 thanks again! |
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#7 |
Registered User
Join Date: Mar 2017
Location: Edmonton
Posts: 369
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Re: Piston ring gap question
Right on perfect. After i checked and rechecked my measurements I was almost thinking i should of went up a size on my cylinders but after talking to the ring manufacture they assured me they run these gaps larger on these engines. I hope to fire mine in next couple weeks my swap went sideways when I decided to put a new floor in my cab
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#8 | |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Piston ring gap question
Quote:
0.056 * 4 would give you 0.024
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#9 |
Registered User
Join Date: Oct 2013
Location: Alabama
Posts: 1,210
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Re: Piston ring gap question
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#10 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: Piston ring gap question
Just checking to see who reads my posts :-)
__________________
1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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