Help with 1.6 roller rockers
07-21-2011, 12:03 PM
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Help with 1.6 roller rockers
I installed edelbrock 1.6 roller rockers on my 305 and they dont seem to be on the center of the spring. It favors away from the stud. How bad can this be also will thus change my length of my push rods
07-21-2011, 12:09 PM
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Car: 1983 Pontiac Firebird
Engine: 400HP 350
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Re: Help with 1.6 roller rockers
Yes, you are going to need long pushrods. YOu're also going to want to invest in a pusrod length checker from Summit.
07-21-2011, 05:05 PM
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Re: Help with 1.6 roller rockers
That's by design.
The rockers aren't supposed to land straight on the valve; they're supposed to be off to the side a little bit, to make the valve rotate.
Has nothing to do with push rod length.
Changing the rockers, by itself, also may or may not affect the "ideal" push rod length. Usually not.
A more important thing to check is where the push rod comes through the hole in the head. THINK about "ratio" for a minute: it's the distance from the rocker pivot to the valve contact point, divided by the distance from the rocker pivot to the push rod seat; right?? Well the rocker mfr couldn't very well move the valve away from the rocker pivot, now could they?
SO what did they do? They decreased the distance from the rocker pivot (which is of course in the same place it always was) and the push rod seat. When they did that, the push rod also moved, closer to the stud.
Check the hole VERY CAREFULLY to make sure the push rod isn't contacting it. Remember, it can clear at the top of the hole, where it's easy to see, but not the bottom. Regardless of where it interferes, if it does, the push rod end and/or the rocker itself will be DESTROYED by the push rod getting forced sideways out of the seat.
Also, check your valve springs VERY CAREFULLY for coil bind at full lift.
The rockers aren't supposed to land straight on the valve; they're supposed to be off to the side a little bit, to make the valve rotate.
Has nothing to do with push rod length.
Changing the rockers, by itself, also may or may not affect the "ideal" push rod length. Usually not.
A more important thing to check is where the push rod comes through the hole in the head. THINK about "ratio" for a minute: it's the distance from the rocker pivot to the valve contact point, divided by the distance from the rocker pivot to the push rod seat; right?? Well the rocker mfr couldn't very well move the valve away from the rocker pivot, now could they?
SO what did they do? They decreased the distance from the rocker pivot (which is of course in the same place it always was) and the push rod seat. When they did that, the push rod also moved, closer to the stud.Check the hole VERY CAREFULLY to make sure the push rod isn't contacting it. Remember, it can clear at the top of the hole, where it's easy to see, but not the bottom. Regardless of where it interferes, if it does, the push rod end and/or the rocker itself will be DESTROYED by the push rod getting forced sideways out of the seat.
Also, check your valve springs VERY CAREFULLY for coil bind at full lift.
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