
December 7th, 2025, 05:26 PM
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-= Dues Paid =-
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 513
Thanks: 37
Thanked 72 Times in 39 Posts
Rep Power: 225
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Re: '65 GMC 1500 project. From the Netherlands
Let me start off with some fantastic news! I managed to score new oil control rings via the company that supplied the piston rings as well!
They only had 4 5.125" x 1/4" rings with expanders left, so they threw in 2 130.5mm (5.138") rings. I installed them and gapped them, needed to open the gaps up somewhat due to the larger bore. Looks like they conformed to the bore pretty good so I'm happy. These bigger rings are plain cast iron, they should break in quickly. They don't have an expander spring but have good wall tension.
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I had already prepped the block for assembly so I was ready to go.
Started with the camshaft that was reground by Mike Jones.
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Installed the NOS main bearings and NOS rubber rear main seal. A small dab of RTV on the seal halves.
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Lifted the massive crankshaft in, a 2 man job. Installed the main caps and paid attention to seal up the rear bearing cap real good.
A dab of RTV in each corner, RTV where the side seals go, anaerobic sealer where the cap meets the block, and assembly lube on crankshaft seal and bearing.
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Crank turns over real smooth, couldn't be happier.
Installed the idler gear and timing cover.
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Then onto pistons. All of them installed real well. Coated bores and rings with engine oil. Staggered the gaps.
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Last edited by Prowbar; December 7th, 2025 at 06:03 PM.
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