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Technically, if it isn't flat, it is no longer a shim. It is a spacer. Shim material is flat by definition. A tapered "shim" is a wedge. Exactly what you don't want exerting pressure on a rocker stand.

Exactly! This is why we have made the correction kits with billet bars that are machined for the correct radii, inside and outside, from the very beginning. I've seen the damage a flat shim can do. Also, a .030"ish shim isn't doing enough for true geometry to make any real difference. With an...

As Gomer Pyle would say, "shame shame shame".:poke:

Talk to Ron Flood at Cedar Machine in North Branch. He's a good guy and recently did a Trick Flow, Six Pack combo that made great power. If he can't find you some power, it isn't there.

Depends on the application and usage. It's best to call to discuss.

Why are they more expensive? Because they can be. Folks will pay more for the assurance that they are engineered for that application. That doesn't necessarily make them any better than anything else on the market. The difference between standard HS rockers and the TF/Edelbrock specific rockers...

Tried to PM, but your inbox is full. The Hughes won't be correct either, even though the roller placement may look better. The shaft position is still way too low.

Yep, every high school kid that failed a class was because the teacher couldn't teach. It couldn't possibly be because they weren't motivated to learn, despite the rest of the students passing that class. I'm guessing Yellow Rose misunderstood what you were saying here.

Sorry Jim, That wasn't a slam. What I was saying is I know better than to make a habit of putting big valves in a factory iron heads, and then crying in my beer when I try to get the bowls right and hit water. Or, maybe not. I just did a set of 516's with a 2.165" intake, and a 1.650" exhaust...

Just for educational purposes, they offered a 2.200" intake valve for stock heads, also. I bought a set way back before I knew any better.

Forget it YR. He doesn't want to learn anything that conflicts with his current perspective. My CAD drawing of rocker motion showed exactly what Smokey said the rocker action should be and he still says that's wrong, so, as the saying goes, "Some men you just can't reach".

Insults and name calling? Let's take a walk back in time to post #8 where you insulted my knowledge and value by encouraging people, in a public open forum, to not give credence to ANY advice I might give. If not for that unprovoked insult, you likely wouldn't have heard a peep out of me on this...

I fixed the one quote that I accidently forgot to put my name in. I figured you would know the difference. Wrong again, apparently. Btw, whose delusional? It's not my delusional. Maybe it's Jim's delusional, or Yellow Rose's delusional. I know! It's RRR's delusional. He's right proud of his...

Nothing ventured, nothing gained.

Oh boy, where to start. First I will say that Jim (IQ52) is a much better diplomat than I am. Where Jim gently chides, I'm ready for a scorched earth approach. I had to wait all day to answer this post, because I was afraid I would say something I would later regret. But then, I realized that...

Bravo, Jim! Unless you find the root of the discrepancy, it is possible to reach an incorrect conclusion. That math question baffles a lot of people, but you are a pretty smart cookie. Now, if Bewey could only answer the other question I asked.

I already had it. And, once I learned something different, and confirmed it with dyno testing, I dropped the old way like a bad habit. Not going back, either. If you did a bit more research, especially concerning mid lift geometry, you might come away with a different perspective. Only a refusal...

Sorry, but I think you've made a lot of claims.

I don't recall the OP only wanting one opinion, and you are dismissing others who gave their opinion with that statement. If that was the case, he could have just sent you a PM and not bothered with starting a thread. But, what I really want to know about this old argument is, Am I Wrong? You...

Maybe, just maybe, with more information the OP, or anyone else for that matter, can make a more informed decision.

Not sure strength in numbers is a good thing if your talking about lemmings. It's like science being settled by consensus and not accurate data. A perfect rocker is something that can't be improved upon. Technology will always find improvements, but math is math. No one ever came up with a...

You can test 100 Billion rockers, and if they are improperly designed, you will get skewed results. Remember GIGO? Garbage in, garbage out. Look at the video link Yellow Rose posted in the Racers Forum. Reid Rockers also confirms what I have been saying. Of course he probably doesn't carry...

If you can gain lift by putting a longer pushrod in the motor, then shouldn't this give you a clue that something isn't kosher with the rocker design? It should, because a properly designed rocker should lose lift if a longer, or shorter than optimum length, pushrod is used. Like I said earlier...

The Crane quick lift rockers achieved quicker lift off the seat by a higher fulcrum, and/or an "unusual" pushrod seat location. They also beat the crap out of the seats, because they closed just as fast.

I doubt that. The most important thing I have ever learned is to think, not let someone else think for me. If you can think and apply logic, a whole new world opens up to you.

And that assumes the rocker is actually designed properly. Pretty much all of them have the angle wrong and the adjuster way too low to get a long enough pushrod in there. I don't know how you can have a "longer than optimum" pushrod in that situation.

Uh oh! Now he gunning for Jim! The hole just keeps getting deeper.

There is not a valve side ratio and a pushrod side ratio. Maybe there is a problem with verbiage here, since in OZ you say extractors, and we say headers, Or, like we say intake manifold, and you say inlet manifold. Still, you are trying to quote Smokey Yunick, and he was American, so that...

Thanks Jim! I'll say it again, I owe you a debt of gratitude for the encouragement you gave after the beat down. Tim (yellow rose) also. Kinda feeling a Gloria Gaynor moment here. I will survive. Absolutely! Just give me a shout if you need some rockers. I'm certain you would be happy with them.

To the OP, my apologies for things getting off track. My advice, for what it's worth, is to take Andys advice and go with the Comp steel rockers, or the PRW steel (more ratios). Either way, the shaft position should be relocated to correct valve side geometry, or if you want both sides right...