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Old 12-19-2004, 03:38 AM   #12
4x4Poet
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Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
I just disassembled my K10's 350. Looks to be never rebuilt. The plastic teeth on the cam sprocket were all there, just not altogether.

One could see about 30 stress fractures; half open cracks, half cracks that hadn't opened yet. The timing chain had mucho slop. At least an inch movement installed. I'm surprised the plastic held out as long as it did. I'd guess that the loose chain rode easy on the teeth so it didn't break. Just conjecture, really.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
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