Valve spring to rocker arm clearance
#1118346
11/21/11 01:38 PM
11/21/11 01:38 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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seriously concidering replacing my w2/w5 erson rocker this winter with T@D's or Harlan Sharp's now come's the tricky part, my valve springs are 1.625 dia and most rocker companys only go up to a 1.550 spring, I was told that they can clearance them a little more but that also weaken's the rocker and I really dont want that issue, now the only other thought was to go to a smaller dia spring, I am not sure of the full open pressure but I do know they are 235# on the seat as I have a tester and do check them a couple time a season,,,my question is which way would you guy's go if this was your motor,,clearance the rocker's or smaller dia spring, if one is available at that seat pressure for the roller cam that I use. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Valve spring to rocker arm clearance
[Re: dartman366]
#1118347
11/21/11 02:01 PM
11/21/11 02:01 PM
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Joined: Feb 2004
Posts: 3,441
Mo.
supercomp
master
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master
Joined: Feb 2004
Posts: 3,441
Mo.
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Re: Valve spring to rocker arm clearance
[Re: supercomp]
#1118348
11/21/11 02:17 PM
11/21/11 02:17 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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.688 intake,.673 exhaust W/1.6 rockers,, also duration is 268/274 @ .050 with 108 lobe seperation. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Valve spring to rocker arm clearance
[Re: rickraw]
#1118352
11/21/11 07:31 PM
11/21/11 07:31 PM
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Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
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My cam is just a little bigger also and I use a 1.56 spring with the HS 1.6 rockers and they clear fine.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Valve spring to rocker arm clearance
[Re: Stanton]
#1118356
11/22/11 08:10 AM
11/22/11 08:10 AM
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Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
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Quote:
"Lift" is insignificant here. The rocker is closest to the spring and/or retainer when the valve is closed so installed height would be the only other thing that might impact the clearance.
The lift figures were being quoted I believe as a form of comparrison for open and closed valve spring pressures in a 1.55 size.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Valve spring to rocker arm clearance
[Re: Guitar Jones]
#1118357
11/22/11 03:25 PM
11/22/11 03:25 PM
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Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
dartman366
OP
I Live Here
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OP
I Live Here
Joined: Jan 2004
Posts: 13,247
Mt. Vernon, Ohio
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Quote:
Quote:
"Lift" is insignificant here. The rocker is closest to the spring and/or retainer when the valve is closed so installed height would be the only other thing that might impact the clearance.
The lift figures were being quoted I believe as a form of comparrison for open and closed valve spring pressures in a 1.55 size.
thats the way I understood it also, but I also understand that the clearance is most critical at the fully closed position and that my friend's is where I am having my issues, I am going to have to find a set of 1.550 springs that will give me 240 to 250 on the seat at an installed height of approx 2.020 ( cannot get the tip of my calipers between the spring and pocket of the head), untill I get the head's pulled and disassembled then this is my best guess, a 1.950 installed height may work also, these head's are seriously due for a freshen any way. 
Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.
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Re: Valve spring to rocker arm clearance
[Re: Stanton]
#1118360
11/22/11 10:10 PM
11/22/11 10:10 PM
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Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,622
in a cattle trailer down by th...
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Quote:
The post started with the OP being concerned about clearance between the rocker and spring. Everybody seems gung-ho to spend his money on a new set of springs. MY POINT is that the size difference is minimal and should not cause any clearance issues. Hell, replace the rockers as intended and try them on the heads. If they contact the sping THEN change those.
I agree but small blocks are considerably different than big blocks when it comes to the valvetrain and clearances. A 1.625 spring will not clear my HS rockers on my W5's. There is at most .010 between the the spring and rocker at 2.0 installed height with my 1.56 springs. Just saying.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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