Ain't seen him yet, but I think they were Thorleys.

http://www.dougthorleyheaders.com/he...ubCategoryID=2

Looks like a good header, but ouch on the price.

I'll get all the info he's done. He's the guy with a '63 and '65 Gal, both 427 8V 4 speed, plus a '66 427 4 gear Impala, plus a Cobra Mustang and a host of others.......

And if he's pulled the EGR I'll tell that too.....

 

If it works so good, why don't they use it at WOT when the engine needs it the most?

 

Maybe you need to re-read what I wrote.

Yes, original intent (and current intent) is to reduce emssions, the side benefit is that at cruise and part throttle, more timing can be run.

At WOT, vacuum advance (as much as 15*'s or so) of timing is removed and only mechanical timing from the dizzy is used. This is all the engine needs anyway (roughly 34-38* BTDC) and more timing and the power will drop off.

Again, there IS a side benefit to EGR.

And since you're probably going to ask me why some of the newer engine do not have EGR, it's because of the newer cam grinds and overlaps that in effect cause reversion of the exhaust gases effectively doing the same thing as EGR. The big plus in doing it with then cam grind (besides less parts) is that the engine's fuel is metered from idle (where before no EGR was present) through WOT as the cam's characteristics (On PR engines) don't change.

 

Ok guys keep it civil in here, discussions are fine but I just want them to remain civil is all. This is a pretty good and quiet forum and I want it to stay that way so no name calling or other.
Thanks

Now to add my .02cetns worth, egr on a computer controlled EFI engine should remain on the engine and in working order unless you modify the fuel delivery tables to compensate for it being removed otherwise you will reduce power and increase fuel consumption.
Now on a carbed engine an EGR WILL reduce power, the exhaust gasses take up space that would otherwise be used by the fuel air mixture thus effecivaly reducing the amount of burnable fuel in the combustion chamber (same basic affect as either reducing the CID of the engine or reducing the CFM of the carb both of which will reduce overall power) it does have the effect of reducing combustion temps but guess what thats because of the previously mentioned reduction in fuel air being introduced into the cylinder you can reduce the combustion temps the same way by lifting your foot slightly does exactly the same thing. Next thing guys go to a lot of trouble to add things like cold air intakes, and on turbo charged engine add intercoolers, insulate the carb from the intake etc, etc why? To reduce the temp of the intake charge making it denser and stronger ok so now you want to add hot exhaust gasses and warm it up? guess what that compounds the problem of replacing some of the fuel/air mixture by reducing it's density. thus once again reducing power. this has been proven both on paper, on Dyno's and at the track.

 

glad to see that taken care of lol

 

Finally saw him the other day.

Thorely headers, a chip (could be a potato chip for all I know, forgot to ask) cold air and a new air flow meter or set up.

We were in a hurry, so sorry for lack of specifics.

But I think if you research those ideas and look on these threads, you will find good info on these type of mods.