Performance Gain Stock Rockers to 1.5RR?

[Rsmith38]

Originally Posted by Dan Fahey

I have been looking everywhere, including old Dyno Books.
Found a video testing Stamped Rocker vs RR Dyno Test on a Jeep engine. They did a lot of interesting upgrades and used Harland Rockers 1.7 Rockers.

After running a series of head and header tests. They ran a test with the Stock Rockers. RR's showed a measurable improvement. The Video did not say what the Stamped Rocker Ratio was. This needs to be answered. If roughly the same the RR's was a nice improvement.



Our LT1 Stock Engines in our Impalas and Camaros it popular to add a 1.6 RT or RR's replacing stock rockers measured at 1.47.

Dyno testing with Bryan Herter showed measured 15hp rear wheel improvement. Got another 5-7 with an upgraded tune for total of 22hp.


Dan

Havent seen the video but the stock ratio rockers are speced as 1.6 and actually measure 1.54 - so yes the RR made more power but are not legal in stock eliminator because of the ratio increase

[Glenn Briglio]

Originally Posted by Rsmith38

Havent seen the video but the stock ratio rockers are speced as 1.6 and actually measure 1.54 - so yes the RR made more power but are not legal in stock eliminator because of the ratio increase

If the spec for stock rocker arm is 1.6 you can surly use an aftermarket roller rocker of 1.6.

[L.Fite]

Probably minimal performance gain, but better longevity/reliability...
(Read: less breakage)