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valve spring?

Old Aug 3, 2011 | 09:39 PM
  #1  
kill4thril's Avatar
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From: liverpool ny
Car: 1990 firbird formula
Engine: 355ci
Transmission: t56 spec3+ cluch
Axle/Gears: 9 bolt disc brake 2.77
valve spring?

what are good valve springs to get with 1.6 rocker arms? i have been looking at some but dont know what ones will work
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Old Aug 3, 2011 | 11:41 PM
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Re: valve spring?

it is advised to not going over .480 valve lift on stock heads.

Also I have read about the press in studs pulling out of the stock heads. I am not sure if it has been said that stronger springs contribute to that or not.
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Old Aug 4, 2011 | 08:04 AM
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Re: valve spring?

Originally Posted by kill4thril
what are good valve springs to get with 1.6 rocker arms?
Springs are supposed to match the cam ( lift ) and are rated accordingly ( on the spring spec sheet )

What will your valve lift be with 1.6 rockers?
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Old Aug 4, 2011 | 08:14 AM
  #4  
kill4thril's Avatar
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From: liverpool ny
Car: 1990 firbird formula
Engine: 355ci
Transmission: t56 spec3+ cluch
Axle/Gears: 9 bolt disc brake 2.77
Re: valve spring?

its the stock cam. i think with 1.5 rockers the lift is .320 somthing and with 1.6 its .345 but im not sure i could be wrong i saw it somewhere on here a long time ago and havnt been abel to find it again
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Old Aug 4, 2011 | 11:22 AM
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From: Pgh PA
Car: 89 5.7 IROC/95 LT1 Corvette
Engine: All 5.7's
Transmission: 700R4 (Roessler)/ZF6
Axle/Gears: 10 bolt Zexel 3.23's. CTW 17" wheel
Re: valve spring?

I'm using the LT4 springs, Price was great. My machinist is having a fit with them though! They are 1.34 base diameter. Requires re machining the valve seat in the head. I'll let you know how they work when I get them back.
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Old Aug 5, 2011 | 01:07 PM
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Re: valve spring?

Someone mentioned not exceed .480. I don't believe stock heads will clear that much. My heads were from a 95 van and need to be machined it is possible but will cost. I wish I could remember their stock clearance. Best way is to find the exact clearance with a dial indicater and then use one of the calculators online. From there remove the spring reinstall the retainer and measure your clearance allow at least .020 extra. I had mine machined to clear .050 and ran .480 lift. Buy the spring to match your lift, it should also provide some rev limit information.
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