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Short and to the point: Peak flow, all by itself, shouldn't be taken as the sole indicator of a heads power potential. You are right, the "area under the curve" is the priority. It is affected by many different properties of the head. Turbo/supercharged engines operate on the same...

It's all about mass. Using the river analogy CFM is how much volume the dam can flow, PSI is the restriction of the dam, LBS/MIN is how much water you are passing through the dam. Chris s

No, I have no experience with the edist at all. I've been wanting to have a go with one just to see how it works out and what it's all about, but we rarely see fast products. Sorry I couldn't help. Chris S

E-Rue, we have them up to 2000psi, are you crazy enough? :lol: As Bill said they are for Motec ecu's. On most of the high boost stuff we do we use a 60psi pressure transducer, costs around $220, made by Data Instruments. The transducers with extreme pressure capability are used for data...

We have done alot of cars with the ls1 coil setup. Porsche's, Mitsubishi's, Honda's, Toyota's etc. Many of the cars we have run them on experience ignition problems when we reach ~180hp/cyl or greater(which in most of the cars has correlated to the mid 30psi range or greater). Better power...

No need for attitude, I was clarifying my statement. Who do you know that has used his core only? Why did they feel it was not good? If they had bad results, it is most likely they used it in an improper application, chose a poor mounting location or their endtank/piping design was flawed...

NJTY180, Yes, when I write core = *core* A core with end tanks, piping, etc. would be an intercooler. :)Chris S

DeQuick's cores are top quality, it's his delivery times that turn people off. Electric fans are a big plus. From what I can see both IC's look good, nice to see new IC's available. Chris S

If you must tune with EGT, experiment. Find what your engine performs the best with. Chris S

OK, Typical valve job is "probably" 30/45 seat/60 No backut on the valve Econo-port Stock vortec heads will flow around 215cfm on an accurate bench, the "typical" valve job will be worth 10/15 cfm. Econo-porting(gasket match and bowl work) varies with the porter. Shoot for at least...

Got a few questions before I comment: What are the valve job angles? Are the valves back-cut? How would you define the port work on the intake? (gasket and bowl, g&b with flash removal, mild stock removal-street, serious rework-race) Can you get some large, high resolution, pics with good...

How much power do you plan to make and at what RPM? Chris S

92 Black Typhoon, keep in mind that we have never seen his heads, but if you are going to purchase new heads it will be near impossible to beat the deal JWaller has unless you can do it yourself. Chris S

Someone really needs to write a GOOD book about cylinder head modifications and optimization. It would help everyone. ALLTRAC and I argue cylinder head modification regularly and the only constant is the word "optimization". The port cross sections, volume, geometry and flow capability should...

BTDT. Kenne Bell what a joke.