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#2462297 - 03/06/18 07:57 PM Stock Rocker Arms - Limits? Inspection?
PurpleBeeper Offline

Registered: 07/05/11
Posts: 618
Loc: Chicago
I'm building a "budget, low-rpm, highway cruiser" 440 & I'm trying to use some used stock rocker arms.

1. What are the limits of a stock rocker arm? I mean, are they limited by spring pressure, cam size, or what? What are those limits?

2. When re-using stock rocker arms, what exactly should I be inspecting? I think I might have 2-3 in my used set that need replacement.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"

#2462356 - 03/06/18 09:12 PM Re: Stock Rocker Arms - Limits? Inspection? [Re: PurpleBeeper]
ahy Offline

Registered: 01/22/07
Posts: 7488
Loc: IN
Rule of thumb, stock style rockers are good for .5" lift and springs that match that type of cam. Mild springs.

#2462361 - 03/06/18 09:24 PM Re: Stock Rocker Arms - Limits? Inspection? [Re: ahy]
top fuel

Registered: 08/26/06
Posts: 1761
Loc: God's Country Maryland
I didn't start seeing failures until I started using double valve springs, then the pushrods would push right through the rockers. Check the area where the pushrods make contact, the cup should be smooth and shiny. The same with where they ride on the valve stems. If these areas are rough and/or torn up replace that rocker.
I love the smell of Deer guts in the morning, it smells like... VICTORY!

#2462408 - 03/06/18 11:31 PM Re: Stock Rocker Arms - Limits? Inspection? [Re: PurpleBeeper]
Exit1965 Offline

Registered: 07/31/03
Posts: 3213
Loc: Rancho Cordova, CA
I have used them (I bought them new about 12 years ago) with the springs that come with edelbrock heads and a .509" cam, many years 0 problems.

#2462411 - 03/06/18 11:36 PM Re: Stock Rocker Arms - Limits? Inspection? [Re: PurpleBeeper]
mopar muscle7271 Offline

Registered: 07/14/13
Posts: 189
Loc: las vegas,nv
Stock 440 rocker arms will handle your cruiser type 440 no problem. Stock is the best for that.a friend of mine built a mild built 440 up to 500hp and re used his stock arms and has no problems with them.i also used them on my mild built 440 to.stay away from cheap after market adjustable rockers. Unless use the expansive ones like sharp,comp cam ones and crane.

#2462440 - 03/07/18 05:22 AM Re: Stock Rocker Arms - Limits? Inspection? [Re: PurpleBeeper]
DusterKid Offline
super stock

Registered: 01/02/05
Posts: 742
Loc: Keymar, MD
I've ran stock rockers for many years on my mild 440 race engine without any issues. Had a .533 cam and used a lighter double valve spring. Just inspect the "cup" where the pushrod goes. If it looks a little extra bulged, replace it, and you'll be fine.

#2462514 - 03/07/18 09:38 AM Re: Stock Rocker Arms - Limits? Inspection? [Re: DusterKid]
Neil Offline
I Live Here

Registered: 01/19/03
Posts: 12371
Loc: Eagle, Idaho
I know someone who used stock rockers on a mild 408 small block and a pushrod poked thru a rocker arm last fall. I don't know the can specs, but he had the stock Edelbrock valve springs.

He went with a set of adjustable 273 rockers so we'll see how that holds up.

#2462517 - 03/07/18 09:40 AM Re: Stock Rocker Arms - Limits? Inspection? [Re: PurpleBeeper]
EV2Bird Offline
No more politics

Registered: 06/23/14
Posts: 3400
Loc: Kansas Roads Between 0 and 140...
Id think the .500 lift rule is good and probably a hydro only cam. Id also keep in mind the rpm range.

My first little bracket car got the ole DC hydro cam and the oem rockers took all the abuse I could give them, it would break up about 7200 and I chased it a bit in the ignition,lifter pump up are but looking back now id not be shocked if the rockers were a factor.


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