Which valve springs for mild hydraulic roller ? - Page 2 - Chevelle Tech
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post #16 of 26 (permalink) Old Apr 17th, 19, 7:19 AM Thread Starter
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Re: Which valve springs for mild hydraulic roller ?

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Originally Posted by 427L88 View Post
Beth, just a fwiw, I run the Isky 8005a for my solid flat tappet ( 7500), and they set up just like that 135/370 @1.900" 1.550" dual spring set up for 600+ lift with Ti retainers.
Wow, that's good to know. Eric at Howards said 155 lbs seat pressure was ok but not to go higher with the stock Howards roller lifters.

The PAC 1220 springs (Comp Cams 26120) are 155# seat pressure and 370# spring rate. I found a deal on Amazon for $160 for a set of the springs. Of course the spring seat cups, retainers and shims all add up to as much as the springs.

I hope to get the 67 Chevelle going by this fall. I wonder how long I'll be satisfied with the small cam. LOL
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post #17 of 26 (permalink) Old Apr 17th, 19, 8:13 PM
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Re: Which valve springs for mild hydraulic roller ?

here is a build for a mild zz502 / edelbrock heads, at the end of the article it list a complete valve train for a mild hydraulic roller with these heads...

How to Install a Crane Cam on a ZZ502 - A Little Bit O? Boost, Part 2

I run this cam /spring combo in a home made zz396, pulls well for a mild BBC

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post #18 of 26 (permalink) Old Apr 18th, 19, 10:31 AM Thread Starter
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by novass View Post
here is a build for a mild zz502 / edelbrock heads, at the end of the article it list a complete valve train for a mild hydraulic roller with these heads...

How to Install a Crane Cam on a ZZ502 - A Little Bit O? Boost, Part 2

I run this cam /spring combo in a home made zz396, pulls well for a mild BBC
That's a lot of closed seat pressure - 200 lbs.

My stock lifters would never take that. Have you got better than stock "low bleed" lifters ?

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post #19 of 26 (permalink) Old Apr 18th, 19, 11:25 AM
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by nashville beth View Post
Here's the engine : a 489 wolfplace rotating assembly, 4.250 forged crank, scat I-beam rods and 4.280" srp forged pistons.

The heads are edelbrock oval ports with stainless 11/32" stem 2.19" intake valves.

The cam is a mild Howards roller, 219/227 @ .550" lift.

The stock springs are edelbrock 5745 , 1.975" installed height, 1.540" OD,
135 seat press, 320 open. They are not recommended to be used on a hyd roller.

I am looking at PAC #1220 because I like that they will lighten the valvetrain.
Has anyone used the PAC 1220's ?

Specs are here : https://www.racingsprings.com/index..../category/339/

PAC has a cheaper spring that would work and it has an inner spring. I know some people like the inner spring in case a spring breaks, it may keep the valve from hitting the piston ?

https://www.racingsprings.com/index..../category/339/
I've done several BBC Howards/Morel HR with the 1220 springs, they work very well, never had any issues. Use the S112 seat with the .570" ID to fit the bronze guides on your heads. I think you will run out of camshaft though to turn 6200.
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post #20 of 26 (permalink) Old Apr 18th, 19, 2:35 PM
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Re: Which valve springs for mild hydraulic roller ?

I still wonder if current springs with shims wont work and save op lots of $?

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post #21 of 26 (permalink) Old Apr 18th, 19, 5:16 PM Thread Starter
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by Malibu ss 64 View Post
I still wonder if current springs with shims wont work and save op lots of $?
They are right on the borderline: 120 seat pressure, 320 lbs open.

You are correct, I could probably get by for a while with them.

But with wolfies rotating assembly, I really want to push it to 6000+.

I just don't trust those springs.

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post #22 of 26 (permalink) Old Apr 18th, 19, 7:13 PM
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by nashville beth View Post
They are right on the borderline: 120 seat pressure, 320 lbs open.

You are correct, I could probably get by for a while with them.

But with wolfies rotating assembly, I really want to push it to 6000+.

I just don't trust those springs.
I am setting up same heads rpm performer O you have, with the same cam they swapped into that zz502 in the article. The .230/.236 .598 .610 112lsa. and my cam card shows 2 different springs based on lifters used. I am using the same springs you already have shimmed to 1.900. The spring pressure is actually pretty correct for your lifters and cam once you set them up at the lower height. The pressures at the 1.975 installed height is on the edge but once you shim them to the 1.900 the seat and open pressure goes up some. That is the way it was explained to me, if I was told wrong I will be looking into more spring pressure.


My cam is billet and I have the isky lifters so I could go with the second spring rate crane recommended for this cam, and it is the same spring they used in that article the crane 96878 but it says you have to use a aftermarket lifter like my isky's with those higher spring pressures.

If your gonna change springs why not get a spring that will work with your current retainers, locks, shims and locators? The thing is you could use the crane springs setup at the stock 1.975 height and that would lower your seat pressure and but still might be too much at max lift. The edelbrock springs the .125 seat at 1.975 becomes .135 seat at 1.900 or close to it. in a simular fasion raising the crane's to 1.975 lowers the seat some. If I am wrong sure Wolfy or one of the others more in the know will correct what I was told.

I got my heads bare so am setting them up with crane locators, but everything else is all edelbrock parts I picked up along the way, new take off's and what not. Valves are elgin 21-4n and rated to .500 spring pressures.

By the way the spring they used: Various solid roller applications for Pro Street and Bracket use. That is from the crane web site.

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Last edited by Jebchevelle; Apr 18th, 19 at 7:27 PM. Reason: height suggestion
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post #23 of 26 (permalink) Old Apr 19th, 19, 5:30 AM
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by nashville beth View Post
They are right on the borderline: 120 seat pressure, 320 lbs open.

You are correct, I could probably get by for a while with them.

But with wolfies rotating assembly, I really want to push it to 6000+.

I just don't trust those springs.
They might be on the borderline without shim.
Heres the spec of the springs
https://www.summitracing.com/parts/edl-5745
If I understand everything correct open pressure is speced at .500 lift?

I would remove one put in a vise to check so coilbind spec is correct with a dial caliper. Also meassure outside and inside of the spring so you can get a cup locator that fits. And to be sure check retainer to guide clearance but I doubt it will be a problem with aftermarket head?

A cup/locator .060 thick and a .030 shim will give you 370-380 open pressure at .550 lift and
150-160 seat. Thats as perfect as it gets imho. If you feel unsure email Mike Lewis and he will help you and can get you a cup/locator and shims to get it correct. Around 60$ total+ some work.

That cam will probably be all done at 5500rpm in a 489.
Some good info.
https://www.lunatipower.com/Tech/Val...pringTech.aspx

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post #24 of 26 (permalink) Old Apr 19th, 19, 10:52 AM Thread Starter
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by Malibu ss 64 View Post
That cam will probably be all done at 5500rpm in a 489.
Some good info.
https://www.lunatipower.com/Tech/Val...pringTech.aspx
Thanks Marcus. Good info.

Hopefully I can report back this fall with the first road test.

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post #25 of 26 (permalink) Old Apr 19th, 19, 3:13 PM
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Re: Which valve springs for mild hydraulic roller ?

Quote:
Originally Posted by nashville beth View Post
That's a lot of closed seat pressure - 200 lbs.

My stock lifters would never take that. Have you got better than stock "low bleed" lifters ?

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post #26 of 26 (permalink) Old Apr 20th, 19, 12:02 AM
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Re: Which valve springs for mild hydraulic roller ?

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Originally Posted by novass View Post
noisy ass morels !
same one's I have as far as I know, will find out how loud they are once I am running them.

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