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Author
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Topic: Rocker Question
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Gear Head
JARED
Member # 779
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posted
 
 
Whats the difference between 1.6 and 1.7 ratio roller rockers and also the differnce between stud and pedstal mount?
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Posts: 5685 | From: EASTBAY | Registered: Jan 2002
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Unregistered
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Member # 786
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posted
quote:
Originally posted by sic91sleeper:
Whats the difference between 1.6 and 1.7 ratio roller rockers and also the differnce between stud and pedstal mount?
I am pretty sure the 1.6's are what come stock on our cars and what all cams you see are specd with. 1.7's increase the lift of any given cam.
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Posts: 1785 | From: Livermore | Registered: Jan 2002
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Fox89GT
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Member # 1539
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posted
I think the pedestal mount are using bolts to hold the rocker and the stud mount (studs are pressed in the heads) use nuts.
Did I get this right??!!?? ![[Confused]](confused.gif)
Posts: 40 | Registered: Jul 2002
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67 Badboy
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Member # 1752
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The 1.6 and 1.7 rockers both add higher lift. If you are going to be using the car mostly for street, you probably don't need to get 1.7 rockers. Those are used for more radical profiles and they require that you change other parts like your pushrods to longer ones and so forth. You will probably have to change your pushrods to hardened ones anyway if you are planning to run roller rockers (guideplate issue).
Pedestal mount studs are pressed into the head. Screw in studs are just that; you screw the studs into the head, making it the better choice if your motor is going to see high revs for extended periods of time.
If you are going the screw in stud route, you will be better off getting 7/16" studs over the 3/8". It's good preventive insurance.
Another question to ask is... aluminum or stainless steel rockers?
Any and all questions can be pretty much answered by your local mechanic. I'm just hoping that he is a gear-head and and not the kind that tells you to leave your car as it is.
Posts: 33 | From: San Jose | Registered: Aug 2002
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Gear Head
JARED
Member # 779
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posted
quote:
Originally posted by 67 Badboy:
The 1.6 and 1.7 rockers both add higher lift. If you are going to be using the car mostly for street, you probably don't need to get 1.7 rockers. Those are used for more radical profiles and they require that you change other parts like your pushrods to longer ones and so forth. You will probably have to change your pushrods to hardened ones anyway if you are planning to run roller rockers (guideplate issue).
Pedestal mount studs are pressed into the head. Screw in studs are just that; you screw the studs into the head, making it the better choice if your motor is going to see high revs for extended periods of time.
If you are going the screw in stud route, you will be better off getting 7/16" studs over the 3/8". It's good preventive insurance.
Another question to ask is... aluminum or stainless steel rockers?
Any and all questions can be pretty much answered by your local mechanic. I'm just hoping that he is a gear-head and and not the kind that tells you to leave your car as it is.
Thanks a lot for your time I really appreciate it. My car is defnatley a street car as you can see in my signature but my car will be geeting some more motor mods here soon such as a set of some afr heads and a xtreme comp cam thats revs pretty high with the tfs R manifold.
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Posts: 5685 | From: EASTBAY | Registered: Jan 2002
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Red Vette
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Member # 870
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posted
Whoa, hold on!!! A pedastal mount rocker system is BOLTED to the head not pressed. They are torqued to 20 ft pounds and are not adjustable. Changing to a stud mount system allows for adjustability with lash. 1.6 rockers are STOCK ratio for small block Fords. If you want to increase your cam profile without changing the cam, upgrading to a 1.7 ratio will increase overall lift and add a minute amount of durration.
For example: if you have a cam in your car with a lift of .430 with 1.6 rockers, changing to 1.7 rockers will make your cam's lift .456
All you do is divide your known cam lift by 1.6, take that total and multiply it by 1.7
If doing this on a stock cam, you should have no problem with valvetrain geometry. Longer pushrods are mainly used to center the Rocker tip over the valve. And if your not running case hardend pushrods now, then you should have no need to just because you changed rockers.
For example: if you have a cam in your car with a lift of .430 with 1.6 rockers, changing to 1.7 rockers will make your cam's lift .456
All you do is divide your known cam lift by 1.6, take that total and multiply it by 1.7
Hope this helps
Posts: 442 | From: At the races | Registered: Feb 2002
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