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Valve spring selection

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dodgerammit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dodgerammit Quote  Post ReplyReply Direct Link To This Post Topic: Valve spring selection
    Posted: Sep/11/2019 at 1:21pm
Cam has .489 lift.
Build is designed for low rpm power. Most time will be spent under 3000 rpm.

Lots of choices. Tell me if I'm looking for the right thing.

Shooting for 1.8 installed height, about 100# seat and about 300# open with coil binding of less than 1.2 for clearance.


What retainers and lock should I go for? I think I'm needing .375 for the valve itself, correct?

Thanks!
84 Grand Wagoneer Garnet Red (mine)360/727/229 44/20
84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15
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Trader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Sep/11/2019 at 6:34pm
If you have stock valves then use the stock retainers.
You may have a problem with dampers if running stock valve seals.
For single upgrade springs, Lunati 73126 will do fine, and COMP + others offer similar for that lift on stock valves, seals and retainers.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BassBoat Quote  Post ReplyReply Direct Link To This Post Posted: Sep/11/2019 at 6:35pm
Those springs are bigger in diameter than needed, and may need work to fit the heads, but other than that meet your requirements.  Pick a spring that fits the heads, and then the retainers that fit the springs and locks that fit both the retainers and valves.  

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dodgerammit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dodgerammit Quote  Post ReplyReply Direct Link To This Post Posted: Sep/12/2019 at 12:43am
Originally posted by BassBoat BassBoat wrote:

Those springs are bigger in diameter than needed, and may need work to fit the heads, but other than that meet your requirements.  Pick a spring that fits the heads, and then the retainers that fit the springs and locks that fit both the retainers and valves.  



Confused here.

The springs I picked are smaller than what are listed to be exact replacements for the engine by isky.
Howards are 1.485

According to isky, replacements are 1.54  https://iskycams.com/shop/index.php?main_page=product_info&products_id=2133

Then rock auto lists 1.36-1.4 as replacements. Also specs a melling for their mta cam @1.5

What OD should I be looking for?
84 Grand Wagoneer Garnet Red (mine)360/727/229 44/20
84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15
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dodgerammit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dodgerammit Quote  Post ReplyReply Direct Link To This Post Posted: Sep/12/2019 at 12:44am
Originally posted by Trader Trader wrote:

If you have stock valves then use the stock retainers.
You may have a problem with dampers if running stock valve seals.
For single upgrade springs, Lunati 73126 will do fine, and COMP + others offer similar for that lift on stock valves, seals and retainers.


Gonna do positive seals on stock valves. Will this change anything?
84 Grand Wagoneer Garnet Red (mine)360/727/229 44/20
84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15
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dodgerammit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dodgerammit Quote  Post ReplyReply Direct Link To This Post Posted: Sep/12/2019 at 1:39pm
Tell me if this looks like everything I'd need to do the valves and springs:

Valves (8 of each-4groove style):

Springs:

Seals (positive style)

Retainers (10 degree):

locks (10 degree-4 groove):


Big thanks to everyone so far in this journey




84 Grand Wagoneer Garnet Red (mine)360/727/229 44/20
84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15
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Trader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Trader Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2019 at 7:12am
The positive seals fit all the dampers made for an AMC as far as I know.
Your list looks fine for your purposes.
 I have seen dampers chew up original nylon seals, these being the largest diameter "stock" valve seals. I don't know what set of springs the person was using.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2019 at 8:02am
Originally posted by dodgerammit dodgerammit wrote:

Originally posted by Trader Trader wrote:

If you have stock valves then use the stock retainers.
You may have a problem with dampers if running stock valve seals.
For single upgrade springs, Lunati 73126 will do fine, and COMP + others offer similar for that lift on stock valves, seals and retainers.


Gonna do positive seals on stock valves. Will this change anything?


I always use positive seals if I have the heads off. I only use the umbrella seals if just wanting to do a valve seal quick fix. 
I have positive seals on my 4.0 and my 390. Not sure what's on the 73 as I didn't build that one - but a Big Mac says it's basic umbrella seals for as cheaply as the previous owner got the engine built. 

Do your positive seals and don't look back. I believe Trader is right on the fit - the positive seals will fit any AMC spring setup that I'm aware of. 

I've used them for decades. We machined and installed positive seals on every valve job or engine rebuild we did when I worked for a boss full time. 
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dodgerammit View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dodgerammit Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2019 at 8:31am
Good deal. I'll get these and the roller rockers ordered.

Any Idea on rocker stud length and how to determine what length I need?
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84 AMC Eagle Wagon (Wife's) Deep blue 258/mushbox/129 30/15
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 68-73 amx Quote  Post ReplyReply Direct Link To This Post Posted: Sep/13/2019 at 9:35pm
I would do a engine mock up . Use adjustable pushrod checker for length, check rocker to retainer clearance , would be good time for clay on piston for valve to piston clearance.
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