comp 921's or prc duals?

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Jul 27, 2009 | 02:33 PM

GFCmgb71

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Racer

Joined: Aug 2008

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From: NYC

comp 921's or prc duals?

Hey guys, I'm preparing to install a g5x3 cam and I'm stuck on which dual valve spring set to purchase. obviously the comps are much better as the price is higher than the prc's and I hear LG uses the comps in their builds. however the prc's are considerably cheaper. the car is a DD and I'll only be getting on it once and awhile...so what do you think? Is it worth the extra money...Thanks

Jul 27, 2009 | 02:59 PM

Tech

Safety Car

Joined: Jun 2005

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From: St. Louis Missouri

I don't think it's worth the extra money. The 921s and Patriot Golds are both proven valve springs with relative low failure and comparable service life. I've only installed one set of PRCs and that person has been happy AFAIK. You might also consider Patriot Gold springs too. They are a few bucks cheaper than the PRCs.

Jul 27, 2009 | 04:04 PM

corvette8189

Safety Car

Joined: Jul 2007

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From: Wichita Falls Texas

comp 921

i tried to save some money too and got the prc springs and with my G5X3 cam, they lasted less than 100 miles 4 springs broke. it could have been a bad batch or somethin but after that i got comp 921 and been good so far.

Jul 27, 2009 | 04:44 PM

Munch

Melting Slicks

Joined: Jun 2007

Posts: 3,011

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From: Greenville SC

St. Jude Donor '10

I am having my set of PRC duals replaced as we speak because they went weak and shrunk in less than 5k miles. I am running 232/234 .595/.598.

Jul 27, 2009 | 04:47 PM

WKMCD

Race Director

Joined: Dec 2004

Posts: 13,760

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From: Haymarket VA

The people who spec'd the cam should spec the springs and installed height. I know LG says to use 921's. Be thankful. My cam guy told me to run PAC 1521's. $$$

I ride better knowing I've got the best drop in spring available in the car.

Jul 27, 2009 | 05:37 PM

ttribe

Racer

Joined: Jul 2008

Posts: 264

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From: Spring Tx

I have the g5x3 112 cam. Trust me, I studied hard, really wanting to save the money. But my research lead me to purchase the 921 kit.

Good luck.

Jul 27, 2009 | 05:44 PM

0Anthony @ LGMotorsports

Former Vendor

Joined: Aug 2005

Posts: 16,897

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From: Lewisville TX

St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13

For what it is worth, we only use the Comp 921 springs. We have found these to be the longest lasting, most dependable spring to use with our cams.

Jul 27, 2009 | 10:37 PM

maybelooking

Le Mans Master

Joined: Aug 2008

Posts: 6,531

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921s.

remember, its not only what lift the spring is rated at.....its also how "stable" the valve train is.

The 921 is just plain and simply a far superior spring.