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Old 02-14-2012, 05:25 AM
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tech support on change of valve springs on pontiac 6057 Edelbrock heads .

Hello my name is Donald Stamatis , i am from Melbourne Australia and i have a question regarding a change of valve springs on my Pontiac 6057 Edelbrock heads . I am changing the camshaft in my engine and i need to change the valve springs to suit the camshaft . The original springs have an installed height of 1.800" and the new springs require an installed height of 1.850" . I can achieve the 1.850" installed height by removing the 0.055" shims from under the valve springs but that only leaves the 0.015" washer under the new springs . Is the 0.015" washer adequate under the springs on its own or will i need to machine the valve spring seats 0.050" and continue to use the 0.050" shims that were under the original springs ? The rates of the new springs are as follows .
Seat Load : 126 lbs @ 1.850"
Open : 369 lbs @ 1.250"
Spring Rate : 403 lbs/in
Coil Bind : 1.195"
I would appreciate any help you can give me regarding my question .
Thank you for your time , its good to be aboard .
Regards : Donald Stamatis .
donstam@hotmail.com :

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Old 02-14-2012, 05:53 AM
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You can get away with just the .015 if that's what gives you the proper pressure. Just make sure the shim is hardened and covers the entire bottom of the spring and any dampner in the spring. Besides giving you the correct pressure the shim also prevents the spring from digging into the spring seat.
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Old 02-14-2012, 06:05 AM
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edelbrock valve spring change .

Thanks for the reply . i wasn't sure if the additional spring pressure would be a problem for such a thin washer even though it is a hardened washer .
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Old 02-14-2012, 06:15 AM
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It won't be a problem as long as the spring seat under the shim is flat.
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Old 02-14-2012, 06:29 AM
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pontiac valve spring change

Flat they are . Thanks again for your help .
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Old 02-14-2012, 07:03 AM
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Using shims without a "locator" on E-heads can be problematic. Locators are generally .060" thick. Without the locator (either a "cup" or not), the spring can and will "dance" around in the pocxket of the head. The heads are machined to accept as much as a 1.650-1.700" OD spring.

I also question the amount of "seat" pressure. What cam are you installing? What brand/size of spring?

Jim
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Old 02-14-2012, 02:13 PM
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Pontiac heads valve spring change

The cam is a comp cam hyd roller with. 540 lift (not huge) .the springs are comp can springs amp the specs I gave are what is on the box. I will check the size of the springs tonight
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Old 02-14-2012, 02:25 PM
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I would rather use +.050 locks.
Also, be aware that a spring with a flat wound damper can cut right through a shim, even a hardened one. I take the dampers out and polish the edge that will contact the shim to remove the sharp edge.
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Old 02-14-2012, 02:39 PM
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valve springs

Thanks for your help
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Old 02-15-2012, 07:28 AM
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Donald,

We set seat pressure at 145-150 for solid flat-tappets, that have similar spring requirements as hyd. rollers. I think yours may be a bit "light". Good for a flat-tappet hydraulic. We don't install hydraulic rollers in Pontiacs, having seen too many lifter failures. You can use solid rollers on the hydraulic cam, though. Just reduce lash to .008" and it will make more power than with the hydraulics, and "live" just fine. Restrictors in the lifter bores ARE called for.

Jim
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Old 02-15-2012, 01:17 PM
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pontiac valve spring change

Hi Jim .
I've decided to go with your advice and install the locaters under the springs it just means i have to get some machining done . When you say that you don't install hyd rollers in pontiac engines because of high failure rate is that something that seems to be more of a problem with pontiac engines or are you referring to the hyd lifter failure rate in general ?

Donald.
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Old 02-16-2012, 07:36 AM
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Donald,

Not specific to Pontiac, no. Olds, Buick and others that use "retro-fit" lifters can suffer. The lifters are simply too "big and tall". They weigh nearly double what the solid rollers weigh. Some have success with them. We've built four engines with them, all of which have been fine but one. He lost a lifter (wheel came out, needles everywhere...) and damaged the cam in the process. Comp gve him "credit" against a solid roller.

Rick Holladay went 10.80s with them in his '65 GTO, but one collapsed within a few months. We removed them and istalled solid rollers on the hydraulic cam, and he picked up .2, no other changes.

We've heard of Olds engines with similar stories. We've come up with a solution, but have yet to get a customer to go for it. The solids are less expensive and more effective, so why bother?

Jim
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