Is this cam too big for stock vortec valve springs?

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Is this cam too big for stock vortec valve springs?

Postby azkevlong » Tue Feb 08, 2011 10:51 pm

Stock vortecs cam specs are as follows, this is also for a roller cam- vortec 305/350's 191º/196º 0.414"/.428" lift on a 111º LSA.

I'm wanting to run this flat tappet cam if I can without changing the valve springs on my vortec headed 350- http://www.summitracing.com/parts/CCA-12-230-2/ . Otherwise I'll order these http://www.alexsparts.com/products/VALV ... OLLER.html and use them with the luanati cam that I already have- http://www.summitracing.com/parts/LUN-10001LK/
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Re: Is this cam too big for stock vortec valve springs?

Postby douche_mcgee » Wed Feb 09, 2011 8:26 am

I wouldn't use the stock roller springs for a flat tappet.
Go with the springs and that lunati.

That lunati cam is perfect for the street with vortec heads.
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Re: Is this cam too big for stock vortec valve springs?

Postby azkevlong » Wed Feb 09, 2011 9:23 pm

Care to elaborate why using the roller springs is a bad Idea? We used them with good results on another build with an rv cam in the past, but I'd like to know the reasoning as I'm not helping someone else this time. This time it's my money on the line.
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Re: Is this cam too big for stock vortec valve springs?

Postby superspirit » Wed Feb 09, 2011 9:43 pm

Springs for a roller cam tend to have higher spring rates to keep the roller lifter on the lobe, as most roller cams run a much more aggressive profile than a standard flat tappet cam, use of the higher pressures on a flat tappet cam will result in premature wear and flattening of the cam lobes. the roller cam you have listed will work just fine with the stock vortec springs, I do believe the stock springs are good to .450 lift .
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Re: Is this cam too big for stock vortec valve springs?

Postby lowblazin94 » Wed Feb 09, 2011 9:54 pm

superspirit wrote:Springs for a roller cam tend to have higher spring rates to keep the roller lifter on the lobe, as most roller cams run a much more aggressive profile than a standard flat tappet cam, use of the higher pressures on a flat tappet cam will result in premature wear and flattening of the cam lobes.


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Re: Is this cam too big for stock vortec valve springs?

Postby azkevlong » Wed Feb 09, 2011 9:58 pm

superspirit wrote:Springs for a roller cam tend to have higher spring rates to keep the roller lifter on the lobe, as most roller cams run a much more aggressive profile than a standard flat tappet cam, use of the higher pressures on a flat tappet cam will result in premature wear and flattening of the cam lobes. the roller cam you have listed will work just fine with the stock vortec springs, I do believe the stock springs are good to .450 lift .


The cams I listed are both flat tappet. I wish I could go roller, but that's way out of the budget for the time being, but in the plans for my 400 build.
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Re: Is this cam too big for stock vortec valve springs?

Postby superspirit » Wed Feb 09, 2011 10:00 pm

When I read the first line about the specs for a roller I thought those were the specs of the cam you were wanting, my bad.
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Re: Is this cam too big for stock vortec valve springs?

Postby lowblazin94 » Wed Feb 09, 2011 10:02 pm

Ah, made the same mistake too :thumbup:
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Re: Is this cam too big for stock vortec valve springs?

Postby bwiencek » Thu Feb 10, 2011 5:54 pm

Check the specs on the FACTORY hydraulic roller springs - they're actually pretty darn soft as far as a performance spring goes - I'd run them with a flat tappet cam assuming no more than .450 lift. If you're looking for more and are going to either use shorter valve stem seals or cut the guides down then I'd run a better spring.
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Re: Is this cam too big for stock vortec valve springs?

Postby fuctup » Fri Feb 11, 2011 3:46 am

They use the same exact springs for the stock Vortec engines and the 350HO which comes with a flat tappet cam. 80# @ 1.70 with a 250-something spring rate IIRC. I'd go with the Lunati cam you have and new springs though.
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