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Old August 21st, 2023, 03:59 PM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
Posts: 392
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Prowbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the roughProwbar is a jewel in the rough
Default Re: '65 GMC 1500 project. From the Netherlands

Got the camshaft in Saturday! Delta did a good job, but the results ticked me off a little at first as they measured them as a hydraulic camshaft. Therefore the opening and closing points have to be taken at the 0.012" and 0.018" lash settings. Seems they had a core with a little flattened intake lobe, as the intake lift isn't as high as I hoped it to be. I believe the stock rockers are 1.5 as opposed to 1.73 which is written down. We'll see how it runs.

Anyway, this probably being an earlier cam(?) it has very small oiling grooves for the heads. I milled them out and also increased the oiling duration to the heads. I am a firm believer that this is better for the engine and positive valve seals. I will try to bleed the trapped air from the rocker shafts when priming the engine by loosening one of the end bolts.

The camshaft and reground lifters have been installed since.

I am also modifying the intake manifold as per James' instructions to remove the 1-3 and 4-6 dividers. It is a hassle to do, but should provide equal flow to all runners. Should have gotten a Magnum manifold, since it already has the dividers removed. But it would have to be imported and freight will cost me an arm and a leg. Anyway, hope to fire her up this week.
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