chancer540

Very informative article here. Seems there are several more advantages to aluminum besides weight and the ability to repair them easier....

Did anyone read this? Guess I'm more partial to aluminum....

Each head has been proven to make power, (cast an aluminum) time and time again.

getrdunn

iTrader: (7)

It is a good to the point article. Running aluminum for me is what Jim suggested. What particular ones he really didn't care. Dart, profiler whatever. Just said what ones to stay away from. He knows the way I run my boats, cars etc. The promaxx was just let's do it for chits and grins cause of what he discovered at the PRI show along with rookie. I've never questioned Jims recommendations. If they weren't what they turned out to be or will be no real big deal. The thread was basically to let others know the good bad and indifferent along with flow numbers. To be honest I'm very flexible other than just want to get as much as I can out of my builds within reason. If the heads are what Jim says they are and flow anything close to a cnc AFR 315 I'd be happy. Time will tell but will continue to post just for others who have interest.

One thing I know for sure is I know my engines could careless what name is on the heads. They just need to perform and make power all the way through and take me to 6k.

SB

iTrader: (1)

332's

SB

iTrader: (1)

You know I do that to stop you momentarily in your tracks each time right ? It's fun to do. LOL.

MILD THUNDER

iTrader: (3)

I have read that.

When educating myself, I try to read articles, but also try to see how it relates to what I am doing in real life. When for years, I've seen guys running supercharged IRON headed engines, without issue in offshore boats, I kinda use that to further my agenda. Im not running a street car, bracket car, 1800hp twin turbo, a blown alky engine, or a dirt racer.

I've seen iron headed engines come from builders like Mercury racing, Richie Zul, Sterling, Teague, etc. Most of the time, that was because of salt water useage. And up until recently, the only decent performing aftermarket BBC iron head, was the Dart Iron Eagles. In the aluminum variety, there are tons more options for an engine builder. The GM castings were poor performing, and the Merlins were not much better out of the box.

Also, its very rare that someone runs a big power engine, and routinely tears down there engines and inspects the components after changes have been made. Hell, many of them, grenede long before normal wear and tear can be inspected. Like valve seat recession, and so on.

Mercury racing, general motors, Teague marine, many industrial engines, etc have moved away from ductile iron valve seats, due to the longevity issues. I personally, would rather get a cylinder head, with at minimum, a powder metal seat, or replace the ductile seats with tungsten tucker seats, if you are looking for something you can log 300+ hours on, and not have exhaust valves leaking like an old faucet. Especally , on forced induction engines , or engines running camshafts that set the valve down on the seat like a jackhammer.

MILD THUNDER

iTrader: (3)

.200 158
.300 240
.400 303
.500 361
.600 406
.700 440
.800 449
.900 456

Those are intake numbers from a fully ported set of EQ iron heads, ported by Chad Speier . Those are some dam good flow numbers from a conventional iron head. Those truck pull guys, make some big power with those heads.

phragle

iTrader: (3)

Do you have unported numbers?

MILD THUNDER

iTrader: (3)

I do. I posted them in my engine quest head thread,. There were flow numbers from my head guy that did my heads, scott foxwell, and another oso member that had jim valako flow them.

Rookie

iTrader: (4)

Are those the 360cc head flow #'s?

SB

iTrader: (1)

I would put money on it,