Spring Recommendation for BB
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
Spring Recommendation for BB
What valve springs would you recommend for a BB with hyd 560/573 lift cam? Target RPM is 6000. Single, single with damper, Beehive?
Looks like the ones my machine chose for my project are binding and breaking push rods on my new engine...............
See post "motor damage after 5 miles - need advice"
Looks like the ones my machine chose for my project are binding and breaking push rods on my new engine...............
See post "motor damage after 5 miles - need advice"
Last edited by Hvymtlc5; Mar 1, 2006 at 09:24 AM.
Race Director
Joined: Feb 1999
Posts: 16,978
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From: In Dreams There Is Truth Ohio
Contact the cam mfg and find out what pressure springs at the seat ...only the cam mfg knows the springs for their cams.
Looks like specs for a L-88 cam. If you get no answer from the cam mfg..maybe GM dual L-88 springs will work.
Ooops...is that a hydraulic or solid cam? if hydraulic, forget the L-88 springs
Looks like specs for a L-88 cam. If you get no answer from the cam mfg..maybe GM dual L-88 springs will work.
Ooops...is that a hydraulic or solid cam? if hydraulic, forget the L-88 springs
Last edited by GDaina; Mar 1, 2006 at 08:51 AM.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
I agree ... contact the cam mfg for their recommended spring.
However ... Here may be a similar cam with its recommended springs & retainers ... from SpeedPro (aka Sealed Power & TRW) catalog:
BBC Hydraulic Flat Tappet w/ stock rocker arm ratio
cam P/N CS1140R: dur 234*/244* @0.050", .553"/.578" valve lift, lobe centerline 112*, power range 3K-6.5K, rough idle.
spring P/N VS1581: Dual w/ damper, OD 1.460", max lift .590", coil bind 1.200", 105# on seat 1.880", 338# @1.250"
retainer P/N VSR7015R: chromemoly, OD 1.370", inner spring dia 1.066", step height .100", valve stem dia 3/8", 7* locks.
However ... Here may be a similar cam with its recommended springs & retainers ... from SpeedPro (aka Sealed Power & TRW) catalog:
BBC Hydraulic Flat Tappet w/ stock rocker arm ratio
cam P/N CS1140R: dur 234*/244* @0.050", .553"/.578" valve lift, lobe centerline 112*, power range 3K-6.5K, rough idle.
spring P/N VS1581: Dual w/ damper, OD 1.460", max lift .590", coil bind 1.200", 105# on seat 1.880", 338# @1.250"
retainer P/N VSR7015R: chromemoly, OD 1.370", inner spring dia 1.066", step height .100", valve stem dia 3/8", 7* locks.
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
Got ahold of Edelbrock..... they recommeded the most expensive springs they have (well just about) 
. Is there a way to determine what I need based on lift so I can get some other brand?
. Is there a way to determine what I need based on lift so I can get some other brand?
Melting Slicks
Joined: Feb 2004
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From: State of Confusion!!!
2018 C2 of Year Winner
Originally Posted by Hvymtlc5
Got ahold of Edelbrock..... they recommeded the most expensive springs they have (well just about) . Is there a way to determine what I need based on lift so I can get some other brand?
. Is there a way to determine what I need based on lift so I can get some other brand?
Le Mans Master
Joined: Jan 2006
Posts: 6,504
Likes: 139
From: Butler Pa
Originally Posted by Hvymtlc5
Got ahold of Edelbrock..... they recommeded the most expensive springs they have (well just about) .
.
Racer
Joined: Jul 2004
Posts: 254
Likes: 1
Hyd flat with the OEM 3/8" heavy valves I would run around 120# on the seat and 320# Open. I would get matching retainers and machined valve locks for the application.
A single spring with a damper is what I would recommend. Beehive is not worth it especially with the heavy valves in OEM heads.
Chris
A single spring with a damper is what I would recommend. Beehive is not worth it especially with the heavy valves in OEM heads.
Chris
Race Director
Joined: Feb 1999
Posts: 16,978
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From: In Dreams There Is Truth Ohio
what you have to know...what is the spring pressure at the seat at the installed height, then buy springs that have identical seat pressure...contact the cam mfg and find out what spring pressure is required for the cam.
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Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
what you have to know...what is the spring pressure at the seat at the installed height, then buy springs that have identical seat pressure
seat.
What exactly does that mean?
Racer
Joined: Jul 2004
Posts: 254
Likes: 1
That means that when the retainer and keepers are installed on the valve that distance between the underside of the retainer on the first step (the largest OD) and the spring pocket is 1.880". At this installed height the spring should have 100# of pressure.
IMO, not enough seat pressure for that cam.
Issue here though is not the spring, it is the fitment of the spring to the OEM retainers. Ask E-brock tech if you can use those springs with OEM GM retainers.
IMO, not enough seat pressure for that cam.
Issue here though is not the spring, it is the fitment of the spring to the OEM retainers. Ask E-brock tech if you can use those springs with OEM GM retainers.
Thread Starter
Melting Slicks
Joined: Mar 2004
Posts: 3,472
Likes: 18
From: Lake Ozark, MO
The springs are there now were made by PBM racing and rated at .0600 lift...which they said were good enough for my cam....I'm being told they're not.... and now the new machine shop says that my Comp Cams roller tip rocker is actually hitting the spring. Looks like everyhting has to be repalced. I've had these heads done 3 times now. I could have aluminum for what is invested in these..... I'm tired and disgusted of the whole thing.....but want to do it right this time.
Race Director
Joined: Feb 1999
Posts: 16,978
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From: In Dreams There Is Truth Ohio
The cam, I assume is Edelbrock? If so, then look for springs that are 100 # at the seat installed. If Edelbrock says that's the spring for their cam, don't argue.
Regarding the rockers hitting the retainer, could be a number of things..Wrong installed height, rocker ratio more than 1.7.
Regarding the rockers hitting the retainer, could be a number of things..Wrong installed height, rocker ratio more than 1.7.
Racer
Joined: Jul 2004
Posts: 254
Likes: 1
Originally Posted by Hvymtlc5
The springs are there now were made by PBM racing and rated at .0600 lift...which they said were good enough for my cam....I'm being told they're not.... and now the new machine shop says that my Comp Cams roller tip rocker is actually hitting the spring. Looks like everyhting has to be repalced. I've had these heads done 3 times now. I could have aluminum for what is invested in these..... I'm tired and disgusted of the whole thing.....but want to do it right this time.
Now because the retainer step does not fit the spring this allows the spring to move when running. Most rockers only clear 1.625" springs so with a your spring diameter of 1.550", the spring doesn't have to move much before it hits the rocker.
Don't quite know where Belleville,IL is but I know of a guy in Glasgow, KY that is one of the best around when it comes to BBC. If you want his number let me know.
Chris Straub
Stef's Performance
www.stefs.com
Drifting
Joined: Jul 2001
Posts: 1,418
Likes: 1
Are you using PC type seals ?
If so , you might want to think about using Clay Smiths dual interference fit springs set at 1.900 . Seat pressure of around 120 after the the springs take their normal set from run in and around 290-300 open at " those " lifts will provide adequate control and long life .
Alot of the springs out there are nearly on/off types like the single Z28 type springs . I like the types that are more progressive in design and they are about a must for the hi intensity nonsymmerical lobe being used these days .
Isky has springs galore if you cannot allow yourself to run the above or are not using PC seals . Some of the best around .
If so , you might want to think about using Clay Smiths dual interference fit springs set at 1.900 . Seat pressure of around 120 after the the springs take their normal set from run in and around 290-300 open at " those " lifts will provide adequate control and long life .
Alot of the springs out there are nearly on/off types like the single Z28 type springs . I like the types that are more progressive in design and they are about a must for the hi intensity nonsymmerical lobe being used these days .
Isky has springs galore if you cannot allow yourself to run the above or are not using PC seals . Some of the best around .
Racer
Joined: Jul 2004
Posts: 254
Likes: 1
Originally Posted by mountainmotor
Are you using PC type seals ?
If so , you might want to think about using Clay Smiths dual interference fit springs set at 1.900 . Seat pressure of around 120 after the the springs take their normal set from run in and around 290-300 open at " those " lifts will provide adequate control and long life .
Alot of the springs out there are nearly on/off types like the single Z28 type springs . I like the types that are more progressive in design and they are about a must for the hi intensity nonsymmerical lobe being used these days .
Isky has springs galore if you cannot allow yourself to run the above or are not using PC seals . Some of the best around .
If so , you might want to think about using Clay Smiths dual interference fit springs set at 1.900 . Seat pressure of around 120 after the the springs take their normal set from run in and around 290-300 open at " those " lifts will provide adequate control and long life .
Alot of the springs out there are nearly on/off types like the single Z28 type springs . I like the types that are more progressive in design and they are about a must for the hi intensity nonsymmerical lobe being used these days .
Isky has springs galore if you cannot allow yourself to run the above or are not using PC seals . Some of the best around .
Mountain,
I can't tell if the valve guide boss has been cut for the PC seals but if I had to guess I would say they haven't. I agree a good Viton posi seal is great for oil control and longevity.