Found them on the Edelbrock site but no prices yet. The specs in the catalog show them to be same but maybe different springs. Supposedly they aren't hand blended in the bowls to save some labour costs but not much info out there yet. Anyone heard any more about them?

 

Don't know anything about it but don't you have good heads on that motor?

 

Nope. The heads on this thing are 452's with the stock valves. I've done lots of porting work on them but I think there is a ton of room for improvement with a good set of heads. The 45lb. weight loss wouldn't hurt also. Would be nice to make more power without pushing it to the edge. On pump gas I've gone as high as 14lbs. boost at 28 degrees timing with water/meth injection. Not enough guts to go higher.

 

Ahh I see. Yeah decent heads are a good thing. I have the 440 source heads. I have heard of people saying quality control is a issue but so far so good on mine. My fingers are crossed. I have only run 8 psi boost with 26* timing to get 11.60s. Think of what could happen with good heads and putting some timing in it. Dollar is good right now maybe look into them...

http://store.440source.com/Stealth-Aluminum-Cylinder-Head-COMPLETE-SINGLE-HEAD/productinfo/200-1055/

 

I think they are just straight plug adaptations, right? I would think they'd be similar to the 440source heads.

 

A couple of things worth remembering:

A) All else being equal, iron heads make a ton more power than aluminum. Aluminum's lighter weight does not overcome the power deficiency; switching to aluminum means bumping compression (or boost) to maintain the same power level. Racers love aluminum not for the light weight, but for its repairability.

B) Staying with a stock port window (valvetrain) means you're dealing with the same limitations as stock iron heads, should you take them to the limit.

Rule A is simple thermodynamics, and Rule B is just a fact of dimensions. No matter how good the aftermarket manufacturer, neither can be overcome.

 

Damn. That sure took the fun out of cyber shopping.