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Diameter of factory valve springs?

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Old Jun 25, 2005 | 07:32 PM
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OUTATIME GTA
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From: Sac, CA
Car: '89 GTA
Axle/Gears: 3.27/9-bolt
Diameter of factory valve springs?
Which of these two Comp. springs would be the best to go with to replace the stockers?
Not sure what the factory diameter is.
I'm putting 1.6 Comp. roller rockers at the same time too.

981-16 Diameter 1.254
or
983-16 Diameter 1.250
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Old Jun 25, 2005 | 09:59 PM
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Stock springs are listed at 1.25", but frequently measure slightly less than that. The seats are supposed to be machined for 1.25" springs, however.
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