1) How much lift will stock valve spings handle? or

2) Will stock springs work with the Xtreme cam that I want to get? It has 212/218 dur @.050, and .487/.495 lift.

3) If not, who makes a stock diameter spring that will work with the cam that I mentioned above? Comp doesn't.

Reason being, I have the factory 083 cast iron heads. I pocket ported them myself, but I neglected to have the valve spring seats machined when I had engine apart.

BTW, the engine is out of an 88' and springs have about 70,000 miles on them.

Somebody made a post about these a few days ago. I was hoping that I'd see an answer, but no body replied.


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87 IROC 350, 3:42 Torsen, pocket ported 083 heads, complete Edelbrock exhaust, Most free mods, Most little mods, aluminum d/s. Edelbrock STB, SSM sfc's, boxed rear suspension pieces, urethane bushings everywhere.
Stock cam, chip, runners, base, and trans
13.94@103mph, 2.25 60'
In the works: ported SLP runners, ported base, Xtreme Cam, homemade suspension pieces, and 27x10 Hoosiers.
Goal: 12.999

 

i'd say no to the stock springs. are you sure comp doesn't make a spring for the cam? that seems odd. if comp doesn't, or even if comp does i'd go to lunati. they make a lot of stock diameter springs.

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ICON Motorsports
1st & 3rd

 

Once you get the cam, the cam spec sheet will recommend springs. If you don't have this sheet, go to compcams.com and look the cam up and find it's sheet. If all this fails, call crower and they'll hook you up. I have springs and retainers from them.

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'88 GTA 350
Headers, catback, free mods, Xtreme energy cam, intake pieces and 2100 RPM TQ

13.40@102.55 MPH
1.90 Sec ------- Best 60FT
104.23 MPH -- Best Trap Speed

AIM HIGH!

 

I do not belive your stock springs will handle that much lift. I also have a set of ported 083 heads off of a 1987 GTA and I am running stock diameter springs that can handle up to .600 lift. With these springs I had to use special keepers that raised the retainer installed height up .050. I have an installed height of 1.750 verse standard installed height of 1.700. I also had to machine my valve guides down .100 so I wouldn't have retainer to guide interfearance. With your lift, I do not believe you will have to machine your guides down, but you need to check that. I bought the spring from my local engine builder so I do not know who makes them. If you need to know this information send me an e-mail and I will give you his phone number.

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1988 Formula 5L/5sp 3.45 gears, SLP cold air kit, MAS gutted, TPIS air foil, TPIS AFPR, MAC headers, Mac under drive pulleys, MAC cat back, Relocated MAT.
Best ET street tires 13.85
Best 60 FT street tires 1.930
Best MPH street tires 99.29

 

that'd be a neat trick to run 1.25 dia. spring up to .6 lift without any coil bind. the special retainers sound like standard aftermarket parts to replace the stock retainers and rotaters. i'd like to know more about them.

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ICON Motorsports
1st & 3rd

 

I just ordered Crane's H-11 springs from Summit for $108. They will handle up to .600" lift, and are stock diameter. I hope i don't need the retainers.
Thanks for the replies.