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Old November 23rd, 2025, 07:26 AM
Prowbar Prowbar is offline
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Join Date: Dec 2020
Location: Friesland, the Netherlands
Truck: 1965 GMC 1500, 478 V6, SM420
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Default Re: '65 GMC 1500 project. From the Netherlands

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A few years ago I researched for a replacement valve springs. I ended up using Comp Cams 972-16

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(this is for a V8, so I have four spares). I tested the spring and got slightly better than stock specs requirement.
Thanks James. I too looked around for springs that were a drop in fit but settled for a stock replacement spring thats a fraction of the cost. With access to machinery it's easy to whip up the part you need to make it all work.

Melling does offer a more heavy duty spring (Melling VS280) with an inner damper. This is probably the better spring to use as you can use a thinner spacer to obtain the same seat pressure.
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