My buddy ports heads at Ron Scrimma's and we flowed a set of your stage 2s on the superflow and were a little low.

a friend who owns a shop in DFW and had one of his customers with your stage 3s on a car with a 383. my buddy gave Yelvi them to flow and i was told those were lower then advertised as well.

im sorry. i didnt know giving personal experience is bashing. Yelvi and Scrimma's superflows are pretty close for a given head. ive been on here since 2002 and have known about this for a while. i wouldnt exactly call myself quick to bash. for the record, Lloyd is one of the most honest, helpful porters ive ever heard about. He also offers bang for the buck that no one else can comes close to, i just think the bench might be a little optimistic. bringing up an issue does not make me a 'basher' any more then someone saying they had a problem with comp R's makes them a basher.

 

what springs are on the heads, double? single beehives? The cam is really pretty healthy? WHat Rockers, ratio? Is your valvetrain geometry correct.
Allot of problems occur in Valvetrain.
Then again the ignition is a good culprit, but you would generally see ignition problems throughout the rpm range.

 

I was just making sure that YOU saw them flowed as opposed to going by what someone had told you.

Whether the heads flow 260 or 280 on someone elses bench, they are very consistant and others have made quite a bit more power with them. It seems this customer was looking for some missing power and your statement seemed like it meant the head flow was possibly the problem. I was just assuring bim that it was not.

The over all port shape and measurements in key areas are the things that make power. Yelvi is definitely a step above me and confirm this for you. The flow #'s are more or less along for the ride as long as they are not going turbulent or "too low". Yelvis bench is about 10 cfm lower than most but then again, he is not selling heads on flow #'s, just the power they make.

Lloyd Elliott
972-617-5671
Eportworks.com

 

One thing to consider as well about the head flow is that if they came off a motor they will somethimes flow less, Soot and other factors can reduce head flow by small percentages.

I seen this in person, a set of DIY Heads I ported flowed really nice after the valvejob and clean-up by my machineshop, later I had to tear down the motor for a few reasons, I sold the heads to a freind and I had them flowed, they flowed about 3 percent less than before, after freshening they were back on par (all on the same bench)

 

Watched Lloyd flow a bunch of heads and I promise you, there are no games and he flows everyone exactly the same. If it’s his work or someone’s grandmother’s heads brought in, doesn’t matter.

If there is a minor difference…….. it’s attributable only to the difference in flow benches on that particular day. Even the clay seal and how it fits can make a minor difference. What his bench says….. is what ya get! It’s the best he knows how to put out and it’s the same for every customer. No one tries harder to please than Lloyd.

What I have seen is that his numbers are consistently getting better using the same bench as he picks more tricks.

In terms of making power or lack of power…………. dyno sheets should be as smooth as a baby’s butt using a zero smoothing factor. If not, your tune is not dead on. Yours is so ruff that you’ve got obvious significant issues that could be about a zillion things from fuel/air being way lean to even spark plug gap or wear. Trouble shooting is the only way you’re going to get max power from your combo and there is a bunch left.

Right now our setup (Lloyds seen the dyno sheets) is extremely smooth up to 6000 rpm but has minor issues between 6000 and 72000 rpm. It’s still enormously smoother as compared to the one posted, but shows we haven’t got the combo nailed yet.

Right now we are trying a multi-coil ignition to see if more spark on top will clear it up and also new Morel lifters to see if that is the issue. The lifters are here, the Delteg ignition is suppose to be in this afternoon and I’m tracking down some narrow body 1.65 rockers to see what effect they have. It’s all in the details and finding what works. Certainly not the flow of the heads.

(Anyone body know a source for narrow body 1.65 rockers as all I’ve found are wide body??)

By far the biggest problem I’ve seen on this list is people not taking the time to make what they have………… work. That’s probably the most important thing you can do. Usually the problem isn’t the dog in the fight, it the fight in the dog.

 

Comp Hi-Techs should do it for you Denny.

 

Thanks!!

Guess I could go on the web page for comp but what is the difference between the Hi-Techs and the Pro-Mags? Being we have no clue as to what they'll actually do (if any) I'm getting little sensative as to spending a lot of money to do basic R&D on a hobby car.

 

They are made of stainless and are stiffer than a Pro Mag but not as light. They are also more money a set, but if you need 1.55, 1.65, 1.7 and 1.8 SBC Rocker Arms they have them along with the 1.5's and 1.6's

Bret

 

Well....... thank you again!