What is the difference between 1.6 and 1.7 rocker arms

Your Website. Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Summit Racing Equipment. Author: OnAllCylinders Staff. Charles says: December 6, at am. Faele says: December 11, at pm. Brooks says: June 9, at pm. Leave a Reply Cancel Your email address will not be published. The article claimed bhp I assume dyno rather than rolling road. Has anyone actually gone down the route of using good heads and 1.

All the best Dave. AFR heads are some of the best in the business. They will flow well even without the higher ratio rockers. A with those heads, the right fuel setup and 1. Not sure if I'd buy the HP as typical though, but I would bet with a good cam and intake it could get there easily enough.

Cliff Beer. Dave, I've studied the 1. Said another way, the 1. As between cam and 1. Good quality heads can make a HUGE difference however. The right AFR's for your can add a significant amount of power. Given the modest cost of good quality heads this is a major improvement for a little amount of money.

Gas mileage may vary however Randy V Staff member. Lifetime Supporter. Cliffbeer2 said:. Jac Mac. Big-Foot said:. Jac Mac here we go Randy, i think CLiff is correct with that comment. I think to remember that in a HOT ROD magazine of this year , they did exactly that test and only changed rocker ratios. Not quite shure of the outcome, but i think to remember that they measured some power gain.

May be one can find that article? Saw the article some time back. If there is more lift at the valve because you have increased the rocker arm ratio, then it only stands to reason that the valve will start to open earlier and close later than it would with the standard ratio.. I've done the same thing on the dyno by tuning for peak power with the 1. There was a measurable difference between the two ratios - but it was negligble. If my memory serves me, it was only a few more pounds of torque, but it did move the torque peak a couple hundred RPM up the scale.

What I did not like was the pushrod angles. In order to achieve the additional. I ended up changing both rockers back to 1. The attraction of course is the simplicity of the change, just meaning swapping the heads with the 1. I looked at doing this on my car and have just not gotten around to it yet. On my engine the current lift is. Everything else on the cam would stay the same. I'm not sure what benifit if any there would be?

John Milmont. You have to look up your head specs and see what they flow at a given lift. My afr cc heads SBC don't flow any more past. Al Jones. Dave - You were looking for performance figures - I can't say how the Edelbrock heads would perform but I do have the chart for my engine using the AFR heads with a mild cam. Carb is a cfm Quickfuel. This engine has 1. Don't know if this will help you but GT40 dyno chart. Last edited: Nov 17, Dyno results GT