help 460 problem
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New User
Joined: May 2010
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help 460 problem
i have a 460 1977 model out of a lincon i have built this motor up i am having a problem with push rods they have came out of the rocker arms 2wice the second time it jumped it bent the push rod i am wondering if the stock push rods and rockers are sufficent for the motor here are some specs on the engine
lift = intake@cam 325 @ valve 556 rocker arm ratio 1.71
exhaust@ cam 329 563
cam timing = .0042 intake opens 41.0 degrees btdc closes 75.0 dgrees abdc
exhaust opens 83.0 degrees bbdc closes 37.0 atdc advertised duration intake 296 exhaust 300
i have bought the cam from summit racing the part number is 354562 powermax hydraulic was told tht the stock push rods and rockers would be fine but now i am having a problem with the push rods slipping out of the rockers and did not rpm the motor if u all have any ideas i would appreciate it thanks
lift = intake@cam 325 @ valve 556 rocker arm ratio 1.71
exhaust@ cam 329 563
cam timing = .0042 intake opens 41.0 degrees btdc closes 75.0 dgrees abdc
exhaust opens 83.0 degrees bbdc closes 37.0 atdc advertised duration intake 296 exhaust 300
i have bought the cam from summit racing the part number is 354562 powermax hydraulic was told tht the stock push rods and rockers would be fine but now i am having a problem with the push rods slipping out of the rockers and did not rpm the motor if u all have any ideas i would appreciate it thanks
Senior User
Joined: Jan 2004
Posts: 156
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From: Carmichael, ca
Did you check the lash when you installed the rocker arms to make sure that you had zero lash? The stock rocker arms are not adjustable so if the rockers are loose when the valve is closed you will have to get longer push rods. You can get an adjustable push rod to figure out what length push rod you need.
Cargo Master
Joined: Oct 2005
Posts: 2,295
Likes: 25
From: NJ
That is too much lift for stock D3VE heads. It will likely chew up the valve seals. The top of the valve guide under the valve cover needs to be machined down to take taht much lift without damaging the guides.
Beyond that, pedestal rockers may be able to take the lift but iut is getting a bit high. What springs, retainers and keepers are you running?
Beyond that, pedestal rockers may be able to take the lift but iut is getting a bit high. What springs, retainers and keepers are you running?
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
Different springs is all he needs on the valves, longer stems is a waste of money. Roller rockers would solve all but the valve spring binding. Whenever installing a cam, ALWAYS use the cam kit with the proper valve springs, retainers and keepers.
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i have put stronger springs in it bought them from summit racing part number 99893
lohere are some figures of springs load closed 120lbs outer 1.875 or 1 7/8
open 328 lbs 1.335 this is figures on spring
lohere are some figures of springs load closed 120lbs outer 1.875 or 1 7/8
open 328 lbs 1.335 this is figures on spring
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Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Strong is not the issue. Coil bind is caused by opening the valve so far that the compressed spring height closes all the coils together making them solid. Which bends the push rods. The right springs are required, not just any strong spring. What does the cam manufacture recommend for springs?
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New User
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460 cam
i bought the cam from summit racing part number is 354562 powermax hydraulic i bought the cam lifters and valve springs tht matched this application the only thing i did not get was new push rods and rockers for this application i just used the stock ones i was told they would be fine with this cam but i am having problems any ideas do i nee a different set of rockers and push rods with push rod guid plates or is it just possible the stock ones tht i re used are not propper for this application i am at a stand point
Post Fiend
Joined: Mar 2004
Posts: 6,056
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From: Union, Washington
I am unaware of any stock valve train that can handle .556" of lift at the valve, I've done .525" with no issues but another 1/4 of an inches is a whole differentworld. A few of the factory hot rod motors can do it, but normal stockers, no. Regardless of what the sales weanies at Summit told you. Remember, they are not the manufacture or even real car guys, just salesmen and making the sale is everything to them. So again, what does the manufacture of the cam recommend?
Senior User
Joined: Jan 2004
Posts: 156
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From: Carmichael, ca
Pull the valve covers & the intake manifold and then turn the engine over by hand - socket on the crank pulley. Look for cool bind, etc. Basically, your going to have to take it apart to figure out what is going on.
Cargo Master
Joined: Oct 2005
Posts: 2,295
Likes: 25
From: NJ
FYI, I run a .540"/.552" lift in one of my 460s which has worked fine for me with pedestal mount rockers. I'm real close to chewwing up the valve seals with the lift on my exhaust valves... It makes me wonder if the OP isn't chewwing his up at .563" Only .011" closer but it gets very tight at this amount of lift.