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Old 03-03-2012, 09:15 PM
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Matching cam with vortec heads help

Hello guys, I'm a noobie, and thinking about buying some vortec heads with springs and maybe using with my cam. I know I should just buy the matching springs and be done with it but just looking to save some $ if I can get away with. Will stock vortec springs will work fine? I have a Lunati Bracket Master Hydraulic Flat Tappet, Advertised Duration 284/284, Lift .458/.458, Basic Operating RPM Range1,500-5,200,

The matching springs specs are:
Spring Rate 462 lbs./in.
Installed Height 1.750 in
Seat Pressure at Installed Height 108 lbs.
Open Height 1.250 in
Open Pressure 339 lbs.

I'm unsure of what stock vortec springs specs are, cain't find any. I don't know how well it will run with stock vortec springs, I'm not gonna be doing any racing, just a street 72 c-10, 360ci, let me know what yall think. Any input will be greatly appreciated, Thanks

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Old 03-03-2012, 11:12 PM
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The first thing you're going to need to do is get the valve guides clearanced. The limit of lift for Vortec heads is .450.
You can get a set of valve springs very cheap from Erson cams and other companies. It's very important to match the springs to the cam. If it's not done you're throwing away horsepower. Years ago there was tests done with high performance cams and stock springs, the engines would lose up to 30 horses due to valve bounce and lack of valve train control. The "Z28" springs are almost avaliable everywhere for cheap and they'll work with your cam just fine.
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Old 03-04-2012, 12:12 AM
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Z28 springs were only about $60 when I bought mine. Discard the inners & go with the outers.
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Old 03-04-2012, 10:39 AM
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Thanks guys I found a few sites with Z28 springs these are the ones yall referring to? Any will work? without machining needed? I just don't wanna make a bone head mistake, still learning alot. Luckily I have a good buddy who knows alot more than me and will be assisting me with the build.

http://www.northernautoparts.com/Pro...entoryId=50942

http://sdparts.com/details/scoggin-d...-center/sd1005

http://www.alexsparts.com/products.p...-.500-MAX-LIFT

Last edited by aguilar_jimmy; 03-04-2012 at 11:05 AM.
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Old 03-04-2012, 11:20 AM
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The ones from Northern auto parts will work just fine. That's where I got mine. The springs are drop ons and go. Just make sure you have the valve guides clearanced as required on Vortec heads 062 and 906 castings.
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Old 03-04-2012, 12:04 PM
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Quote:
Originally Posted by DoubleVision
The ones from Northern auto parts will work just fine. That's where I got mine. The springs are drop ons and go. Just make sure you have the valve guides clearanced as required on Vortec heads 062 and 906 castings.
What this guy says. It is up to the motor builder to double-check the clearances when swapping parts! Do this.
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Old 03-04-2012, 03:54 PM
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Thanks for the help
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