1.6rr ??
1.6rr ?? It was recommended by a forum member to get 1.6rr (NSA) how do these stack up to those (1.6 rr (crane gold) 3/8 stud sa)? I was told the (NSA) would be goog for 10-12 HP).
Agreed with the above...7/16" stud NSA 1.6 rr's. Either Crane Golds or Comp Pro Mags would be my recommendation. Get hardened pushrods and guideplates as mentioned. You will also need LT4 springs at the minimum.
+1 I think with pro mags you will need to clearance the valve covers though
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Staging Lane
Joined: Apr 2007
Posts: 91
Likes: 0
please explain Was reading this thread and i am now wondering if someone can give me a link or explain to me how you get horsepower by simply changing to 1.6s? Not being sarcastic, i just have little knowledge on this and just dont see how. 
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You gain power by loosing friction and by opening the valves higher. Full roller rockers have almost no friction compared the stock cast rockers being that they pivot using bearings. They have a ratio of 1.6 instead of the stock 1.5 ratio. For example a .500 lift cam using 1.5 rockers is a .533 lift cam when using 1.6 rockers. And being that the ratio is higher, the valves are open higher throughout the whole duration of the lobe which means a lot more air flow. Full roller rockers also have a roller tip where the valve meets the rocker. This also means less friction.
Staging Lane
Joined: Apr 2007
Posts: 91
Likes: 0
You gain power by loosing friction and by opening the valves higher. Full roller rockers have almost no friction compared the stock cast rockers being that they pivot using bearings. They have a ratio of 1.6 instead of the stock 1.5 ratio. For example a .500 lift cam using 1.5 rockers is a .533 lift cam when using 1.6 rockers. And being that the ratio is higher, the valves are open higher throughout the whole duration of the lobe which means a lot more air flow. Full roller rockers also have a roller tip where the valve meets the rocker. This also means less friction.
oh and ty very much for the explanation.
Read this article about roller rockers:
Roller Rocker Article
Here you can see that most of the horsepower is gained from the reduction of friction. With that being said, it is safe to say that you will not see the same gains from using them with stock springs as compared to aftermarket valve springs which have higher seat pressures.
Roller Rocker Article
Here you can see that most of the horsepower is gained from the reduction of friction. With that being said, it is safe to say that you will not see the same gains from using them with stock springs as compared to aftermarket valve springs which have higher seat pressures.
Read this article about roller rockers:
Roller Rocker Article
Here you can see that most of the horsepower is gained from the reduction of friction. With that being said, it is safe to say that you will not see the same gains from using them with stock springs as compared to aftermarket valve springs which have higher seat pressures.
Roller Rocker Article
Here you can see that most of the horsepower is gained from the reduction of friction. With that being said, it is safe to say that you will not see the same gains from using them with stock springs as compared to aftermarket valve springs which have higher seat pressures.
I went with the 1.6 SA Crane Golds and the LT4 springs Im very pleased with them. Since I've added them and removed my speaker box with 2 12" Subs I've picked up 3-4mph in the quarter mile......I'm very happy with mine, but I believe if i were going todo it again I would just go with a set of NSA and guideplates
