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07-28-2009, 09:37 AM
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#1 |
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Junior Member
Join Date: Nov 2007
Posts: 27
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Valve spring life
I hear talk of superstock racers that have to change valve springs after 10 runs, is this for real? I know they run nearly an inch of lift, and almost 9000 rpms, but nascar runs 9000 for 500 miles. THOUGHTS.
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07-28-2009, 11:15 AM
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#2 | |
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Banned
Join Date: Feb 2008
Posts: 852
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Re: Valve spring life
NASCAR Cams are smooth cams and no where the jerk a good Drag Race cam has.
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07-28-2009, 03:19 PM
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#3 |
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Member
Join Date: Mar 2007
Location: Lake Orion, Michigan
Posts: 337
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Liked 53 Times in 13 Posts
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Re: Valve spring life
It depend on what class you're running. Since I use the "441" casting SBC head i'm limited on how big my valve spring pocket can be cut for the 1.64 spring without hitting a water jacket, so I use the 1.55 spring and yes you get only 10-15 runs out of a set, and it could go either way depend on how high you rev your motor. Luke
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07-28-2009, 07:23 PM
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#4 |
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Member
Join Date: Nov 2001
Location: Marion,In.
Posts: 267
Likes: 60
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Re: Valve spring life
I was told the hot set-up in valve springs for Super Stock are PAC . Used on a lot of Pro Stockers and Comp engines. Suppose to have long life. Check them out at racingsprings.com.
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07-29-2009, 04:12 PM
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#5 |
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Veteran Member
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
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Re: Valve spring life
I really like the 1.5" dia PACs. Got mine from Patterson Racing Engines.
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Ed Wright 4156 SS/JA |
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07-29-2009, 05:00 PM
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#6 |
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Member
Join Date: May 2003
Location: Ontario, calif
Posts: 211
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Re: Valve spring life
It's like anything "You get what you pay for" Comp #26082 should last over a season
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Joe Schweigert 751 SS |
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07-29-2009, 07:01 PM
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#7 |
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Senior Member
Join Date: Aug 2003
Location: Pierce NE
Posts: 936
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Re: Valve spring life
I use 947 comp springs 1.85 installed ht 400 lbs on the seat will set in about 380 to 360 will last me 2 years or about 300 plus runs on my 283 520 head. I shift at 9000 same in the lights. Camshaft and rockers ratio have a lot to do with it along with harmonics. Tom
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Tom Meyer 5240 SS Stock ??? |
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07-29-2009, 07:04 PM
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#8 | |
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Member
Join Date: Jan 2002
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Re: Valve spring life
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Jesse Knapp 4899 STK, SS |
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