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Old 08-05-2007, 10:36 PM
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Z28 springs

I recently bought a set of chevy 2.02 heads and he said that they had Z28 springs on them.. Does anybody know if they are good springs or not??

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Old 08-05-2007, 11:06 PM
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The Z/28 springs are the same ones that came on the 1967-69 Z/28`s that had a duntov solid lifter 30/30 cam. These springs will work on quite a variety of flat tappet cams be they solid or hydraulic lift. But of course, when lifts and durations get higher than the spring can handle, it needs to have the correct springs. If I remember correctly the 30/30 cam had .485 lift, so a cam up to .485 lift should be okay, as long as it`s not a roller cam. Roller cams require a much more aggressive spring and should always be matched to what the manufactuer recommends. However, some cams today in the flat tappet line have maxed out ramps, and even if there lift falls under the Z/28`s springs max, it could cause issues. I would ask my machinist to be sure if in doubt.
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Old 08-06-2007, 01:08 AM
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"he said"
You may not have enough experience on this rock to know this yet, but I'm gonna upgrade you a little. TRUST NOBODY.

It doesn't matter at all if they are or are not Z28 or XZY-1073 or doodly-squat springs. What matters is like DV said, are they going to match the cam and intended performance of the vehicle you are going to use them in. Follow DV's advice. Disassemble the heads and have a machinist test them for total lift capability before coil bind, on-seat pressure and pressure at the max lift of the valve with the cam you're going to use.
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Old 08-06-2007, 11:57 PM
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This is how much to trust advertisers. The original factory Z-28 302's used the same valve springs as the 2-bbl 307's and 350's (pn 3911068). The ones who advertise "Z-28 springs" seem to be trying to mimic the specs of the factory "off-road" springs (pn 3927142) that were designed to be used with the "off-road" camshaft (pn 3927140), neither of which were actual production items.

So basically you could have bone-stock grandpa-motor valve springs, and they wouldn't actually be lying.

Do like DV & TI said and have them checked for sure.
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