C1 & C2 Corvettes General C1 Corvette & C2 Corvette Discussion, Technical Info, Performance Upgrades, Project Builds, Restorations

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Old Feb 12, 2020 | 10:24 AM
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John M Steffen
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From: Eudora Ks
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Hello can anyone tell me does a L88 427 use a thin top piston ring Trying to determine if I have a L88 it has the extra plug for the oil cooler 7/16 rod bolts and 12.5:1 pistons date code H 28 9 casting #3963512. CE067152. With iron heads 3919840 E 15 8 GM 4T I understand doesn’t have aluminum heads but wondering about block
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Old Feb 12, 2020 | 11:42 AM
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Hi, moved your post here in the C2 section, should reach the right people here.
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Old Feb 12, 2020 | 12:43 PM
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AFAIK, they're supposed to be 1/16" inch top and second compression rings. Other 427s (L72/L72/L36) have 5/64" top and second compression rings.
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Old Feb 12, 2020 | 12:55 PM
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John, in the future, think about entering a subject title that describes the content of your post, so people will have a reason to click on it and possibly answer questions you may have. Entering your first name is not informative.
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