Anyone use 1.7 ratio rocker arms???

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For a typical street/strip or bracket race build, I wouldn’t run any rocker ratio that required a lot of rework to the heads being used.

I’ve done the rocker test on the dyno often enough to know that:
A- it doesn’t always improve power
B- sometimes it even makes less power
C- even when there are positive gains, they are often minor
 
PRH said:
For a typical street/strip or bracket race build, I wouldn’t run any rocker ratio that required a lot of rework to the heads being used.

I’ve done the rocker test on the dyno often enough to know that:
A- it doesn’t always improve power
B- sometimes it even makes less power
C- even when there are positive gains, they are often minor
Click to expand...

C'mon man.. it's a speed secret right!!! :) LOL...
 
When engine masters did a show on changing rocker arms and ratios. The 1.5 to 1.6 resulted in 20 more horsepower. YMMV.
Screenshot 2022-07-31 173205.png
 
Bakerlite said:
I guess the point is, Hassle Vs HP...
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I replaced mine with 1.6 as my cam was a bit on the small side for a rb stroker. It was easy enough when that was all I changed. No back to back dyno comparisons as I was also degreeing my cam that was 8* retarded as well.
 
Assuming 1.7 rockers will make more HP is a big mistake. Every engine combination is going to be different when it comes to rocker ratios. Some will make more power, some might lose power.
As I alluded to earlier, more load on the prods [ more deflection: loss of lift & area under the curve], more valve spring needed, less V to P clearance, closer to coil bind, reduced retainer to guide clearance.
All of these parameters may be ok, but they should be thought about...& checked.
 
Kent mosby said:
I replaced mine with 1.6 as my cam was a bit on the small side for a rb stroker. It was easy enough when that was all I changed. No back to back dyno comparisons as I was also degreeing my cam that was 8* retarded as well.
Click to expand...
Yeah, going to the 1.6 is popular..
 
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