Valve Spring Life

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Feb 12, 2022 | 12:58 PM

#11

blsnelling

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Quote:

Originally Posted by 1FastBrick

Pull a couple and check them.

Just for the record PAC 1218 spring specs:

Install Height - 1.800"
Load at Installed Height - 130#
Spring Open Height - 1.200"
Spring Open Load - 318#

Something like this should work in a vise.

Mini Spring Tester

0-700 Gauge

Spring Height Micrometer

Feb 12, 2022 | 01:17 PM

#12

MikeGyver

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From: Suburban Chicago

Quote:

Originally Posted by RedXray

Depends when the breakage occurs...

Mine broke at 70 mph cruising, so about 2200 rpm. Destroyed the engine.

https://www.performancetrucks.net/fo...prings-556713/

Feb 12, 2022 | 01:50 PM

#13

arthursc2

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Quote:

Originally Posted by MikeGyver

Mine broke at 70 mph cruising, so about 2200 rpm. Destroyed the engine.

https://www.performancetrucks.net/fo...prings-556713/

that sucked hard man. That still hurts to read 😖

Feb 12, 2022 | 08:18 PM

#14

MikeGyver

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From: Suburban Chicago

Thanks. Now quit using single valve springs.

Feb 14, 2022 | 12:53 AM

#15

1FastBrick

Custm2500's Rude Friend

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From: JunkYard

You should ask Dantheman1540 about Pac 1218 singles in his Tahoe. Although it didn't cost him a motor like MikeGyver...

https://www.performancetrucks.net/fo...6/#post5488143

Feb 14, 2022 | 06:44 AM

#16

dantheman1540

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Joined: Jun 2014

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From: At the dump with a clutch

I got very lucky, it died at idle OMW to work. The valve bounced 4 or 5 times off the piston before it lodged itself in the head. Not using singles anymore!