7 degree locks
#3148405
06/03/23 01:55 PM
06/03/23 01:55 PM
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Joined: Mar 2008
Posts: 554 Kentucky
clovis
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Setting up my heads (Edelbrock RPM) for an aluminum rod 383. On my old 383 906/OEM rods I was spinning 6800-6900 through the lights, so I am thinking with the new combo I will pick up 3-4 mph and be spinning 7200-7300 so I have upped my spring pressure to around 410. It took some time to find the right spring which I now have a set of Comp 929 and 977. My problem now is finding retainers that fit the springs. I have a set of Comp Ti to fit the the 977 spring but they are 7 degree. Just wanted some feedback on running the 7 degree locks, as I have read where some shops do not hesitate to run 7 degree stuff while some claim pull through at anything north of 350. I am 155/410 at .580 net lift
When you are sizing retainers if you can get within .010 for inner and outer is that sufficient or do both really need to be a press fit? The ones I referenced above are .000/+.010 which at this point I am calling good.
Thanks for the help.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: clovis]
#3148458
06/03/23 04:59 PM
06/03/23 04:59 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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I Live Here
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I have a set of Comp Ti to fit the the 977 spring but they are 7 degree. I don’t see those in my Comp catalog.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 7 degree locks
[Re: fast68plymouth]
#3148520
06/04/23 12:19 AM
06/04/23 12:19 AM
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Joined: Mar 2008
Posts: 554 Kentucky
clovis
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Maybe they’re not Comp-It is the one on the left in the photo.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: clovis]
#3148521
06/04/23 12:37 AM
06/04/23 12:37 AM
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Joined: Nov 2003
Posts: 1,366 Out of the State of Confusion
blue_stocker
pro stock
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pro stock
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Ferrea valves highly recommenmds NOT using springs with dampers with Ti retainers as they claim it'll shred them leading to catastrophic engine failure. It might be a good idea to look into this...protect your investment.
I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them. Thomas Jefferson
Freedom must be repurchased by every new generation General Daniel Jones, WW2 Tuskegee Airmen
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Re: 7 degree locks
[Re: blue_stocker]
#3148556
06/04/23 10:02 AM
06/04/23 10:02 AM
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Joined: May 2005
Posts: 2,007 Apollo, PA.
B1MAXX
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I would not personally trust a 7mm in titanium. I thought the whole 10 degree basically was to prevent pull out on Ti. Especially if used. People forget that titanium's are wear parts and should get replaced. Just my That being said I have run aluminum retainers 7 degree with the recommended mopar spring for the.557 cam 30 year ago and never dropped a valve, but probably only put 2-3 hundred runs on them before moving on/up. So they would probably work fine. At least for a few thousand runs. All that being said my personal fav is the lightweight h-13's
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Re: 7 degree locks
[Re: B1MAXX]
#3148581
06/04/23 12:31 PM
06/04/23 12:31 PM
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Joined: Mar 2008
Posts: 554 Kentucky
clovis
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Take it as internet reading but one of the citied reasons for 10 degree locks was ease of disassembly and having just taken a set of 7 degrees out of these beads I get it. It also states that a 7 degree has more clamping pressure which is why NASCAR use the Super 7 which are apparently 8 degrees. There was one comment that a Super 7 is a 3/8” 7* lock that is adjusted for different valve sizes.
My 10 degree Ti retainers do have a small wear grove around the edge of the first step from the dampner. I do think I am going to prep my springs this time and remove all the edges maybe even on the dampner. I not notice that a 1.500 spring in the Edelbrock spring cups do have a very slight interference fit. I think I want to avoid a situation where it could try and pick up the cup. I think it is just the edge of the spring catching it.
Last edited by clovis; 06/04/23 01:10 PM.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: clovis]
#3148623
06/04/23 03:14 PM
06/04/23 03:14 PM
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Joined: Jan 2003
Posts: 28,069 Irving, TX
feets
Senior Management
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Senior Management
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Irving, TX
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If your Ti retainers show wear then you've been dumping gritty Ti dust in your oil. That stuff accelerates wear throughout the engine. Ok for race but not the best for long duration street use.
Have you dug through the Isky catalog to see if they had compatible parts?
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: 7 degree locks
[Re: feets]
#3149247
06/06/23 10:44 PM
06/06/23 10:44 PM
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Joined: Mar 2008
Posts: 554 Kentucky
clovis
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Was on vacation when I started this, so I am home now and wanted to add some pictures.
Here are some pictures of the retainers. Like Dwayne said above they are not Comp and I have not been able to find many possibilities for a 7* 11/32 Ti retainer with the measurements I have 1.375/1.060/.680. I assume they are 7* 11/32 retainers, as when I assembly them on the bare 11/32 valve out of the head they stay in place and the locks look to sit where they need. They are thinner (.075) on the top portion, but otherwise they fit the Comp 977 spring very well.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: clovis]
#3149249
06/06/23 10:48 PM
06/06/23 10:48 PM
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Posts: 554 Kentucky
clovis
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Here are a few of how the they fit the valve.
Last edited by clovis; 06/06/23 10:49 PM.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: clovis]
#3149351
06/07/23 11:09 AM
06/07/23 11:09 AM
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Joined: Jul 2008
Posts: 610 Boise
Moparteacher
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Are you sure they are titanium, and not aluminum. I have a set of old school aluminum retainers that look very similiar, but then don't just about all retainers look similiar...? Have you checked the engagement by looking at the contact area with some machinist dye?
BTW, Manley makes a 7 degree titanium retainer for their Super 7 locks.
Last edited by Moparteacher; 06/07/23 11:15 AM.
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Re: 7 degree locks
[Re: Moparteacher]
#3149453
06/07/23 04:35 PM
06/07/23 04:35 PM
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Joined: Mar 2008
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clovis
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That is a great question. Once you start looking at them they do appear to be a lot more scratched and dented than my other Ti retainers so maybe they are. I guess I will see if I can make some sparks tonight or some marks on glass.
I guess I can also put a little dye on them to check the engagement.
Anyone know if the Edelbrock 7* locks that come on the heads are stamped or machined? I was thinking of using the locks that came on the heads unless the census is not too.
Last edited by clovis; 06/07/23 04:49 PM.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: Moparteacher]
#3149541
06/07/23 08:58 PM
06/07/23 08:58 PM
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Joined: Jan 2003
Posts: 6,149 Melbourne , Australia
LA360
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master
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Are you sure they are titanium, and not aluminum. I have a set of old school aluminum retainers that look very similiar, but then don't just about all retainers look similiar...? Have you checked the engagement by looking at the contact area with some machinist dye?
BTW, Manley makes a 7 degree titanium retainer for their Super 7 locks. They are definately titanium. I look at it every day at work. They are a bit knocked around though. As has been mentioned, I'd not run a dampener spring in them.
Alan Jones
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Re: 7 degree locks
[Re: LA360]
#3149584
06/07/23 10:20 PM
06/07/23 10:20 PM
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clovis
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Yep, rubbed on the glass tonight and they left a mark so Ti it is.
Can you simply remove a dampner from a spring that came with one or is that a no no?
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: 7 degree locks
[Re: B1MAXX]
#3149745
06/08/23 03:06 PM
06/08/23 03:06 PM
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Joined: Aug 2003
Posts: 43,285 Bend,OR USA
Cab_Burge
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Last edited by Cab_Burge; 06/08/23 03:34 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: 7 degree locks
[Re: Cab_Burge]
#3149770
06/08/23 03:51 PM
06/08/23 03:51 PM
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Joined: Feb 2005
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pittsburghracer
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Most of these engines are only raced at two Mopar events a year. Last about 126 years at that rate.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 7 degree locks
[Re: pittsburghracer]
#3149872
06/08/23 11:30 PM
06/08/23 11:30 PM
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Joined: Mar 2008
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clovis
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Thanks for all the help.
Anyone know if the locks that come on the Edelbrock heads are stamped or machined? Just wanted to see if I could use them without much worry.
'75 Plymouth Duster Phase I 451 906/590/2-660 10.75/126 Phase II 451 Stage VI/590/1050 9.82/135 Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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