|05-03-2003 06:44 PM|
|dirtlmfan||The vortec head is a great street head because of its lower RPM torque characteristics. The GM castings are not a real reliable racing head because of its thin casting. The iron eagle head really begins to shine (especially a ported and angle milled version with a big cam and open plenium intake like the Victor Jr.) above 6,500 RPM. This is do mainly to the larger valves in the iron eagles. The iron eagle is a much better racing head because of its thick casting. The 230 version of the iron eagle was designed for stroked small blocks like the 406, but I've seen 377's (destroked 400) use them effectivly in a dirt late model.|
|05-03-2003 06:10 PM|
|USA1||Vortec heads only came on trucks and vans with the L31 5.7 engine. The truck heads were used from 1996 to 1999 and the van heads were used from 1996 to the present I believe. The chambers from the factory are 64 cc. They do flow well due to the combustion chamber design. They are basically a cast iron version of the LT1 aluminum head.|
|05-03-2003 04:22 AM|
I've read on the net that many of the vortec heads flow as well as some of the affordable aluminum heads. My personal experince with the vortec is limited to only one project. I rebuilt a 74 corvette 350. I actually bought a set of junk yard vortecs off a camaro and had the machine shop go through them. $50 for the heads and $264 for the machine work.
The best part about the vortec swap was the chambers on the stock heads were 76cc and the vortec came in at 58cc so this also raised the compression. Big change in the car performance.
Believe me I would have loved to had a nice set of aluminum heads, but didnt have that kind of money, so the vortec upgrade was a good solution for me.
|05-03-2003 12:47 AM|
|chevy302dz||Vortec's are good for a mild to moderate bulid up, after that I'd go for the iron eagles. <a href="http://www.parts123.com/PartFrame.asp?ZTM=cadegeca&GHOME=www.dirttrackthun der.com&TITLE=Dirt_Track_Thunder" target="_blank">http://www.parts123.com/PartFrame.asp?ZTM=cadegeca&GHOME=www.dirttrackthun der.com&TITLE=Dirt_Track_Thunder</a> has the the dart heads on sale|
|05-02-2003 03:01 PM|
|dran04u||What I think go's with the vortec's and the one's I just got by PRO TOPLINE these vortecs are redesigned by PRO ACTION, thicker decks and thicker where GM vortec heads crack guides moved down so no machining for higher lift, smoother casting inside runners and bowls so no need for porting which they say dont mess with the vortec head. These have 194 and 150 stainless valves and 510 lift springs for $499.00 + shipping and these are very nice looking heads for that little a price. Ill be posting back when I put my vortecs to the test and read about these!|
|04-23-2003 10:11 PM|
|franklin289||I actually prefer Cast Iron in any form. Aluminum heads are great for all out racing, but Cast Irons will flow just as good with the ports cleaned up. Actually, I've heard if the two heads were identical with ports and valves, the Cast Iron would make more power because it holds heat longer increasing the charge's velocity. Plus, one bad overheat and your $1000 heads are gonna be cracked.|
|04-23-2003 04:41 PM|
|chrismac||well i have read some articles talking about iron vs. aluminum. the ports are the same size etc. and they both really made the same power. only advantage i have seen is the weight. Iron builds heat and most of the time heat builds power. I have a set or sportsmans and no complaints here. just the ports are ruff. just clean them up and the rockin and rollin is on.|
|04-22-2003 12:53 PM|
|ztoy||I am running Dart Iron Eagle 215s and they are great!|
|04-22-2003 12:25 PM|
|wild1||The vortec and the sportsman heads, how much horse power would they be capable of? are we just talking a sbc that makes under 425 hp? I have seen the flow number's for alot of the aftermarket heads and unless your buying an all out race motor, Id go with the sportsman or the vortec heads, the only heads that seem worth the money are the AFR 195CC heads, and I hear these heads may be cabable of high tens with a 406 cid in a nova.....I am personaly going with the AFR 195CC heads in the future, but I like challenges, I am porting a set of cast Iron heads casting #3795896, 60cc chambers and I will add 2.05x1.60 valves I suspect to get as much out of these heads as the sportsmans...I am shooting for 550hp from a 383, Think I can get there with these castings?|
|02-26-2003 04:55 PM|
ooopps never mind
[ February 26, 2003: Message edited by: 409guy ]</p>
|02-26-2003 11:08 AM|
Bill McCabe: I have been doing some research for an engine im building now and I will go with the steel vortec heads. couldn't justify the gains from using aluminum over the cast iron items. at $ 250.00 each ready to run this seems to be the best bargain going. What do others think.
I have built a 383 with the Vortec heads and could not agree with you more. They make huge power where you drive and beyond. For that extra 50 hp, you pay a large amount and use it very little in the aluminium head price range. Further, I have read that the aluminum fast burn is exactly the same head as the L31 Vortec except that it is aluminum.
|02-26-2003 05:24 AM|
|ztoy||cool, thats what I am running although I wish I was turning that king of hp with them! lol|
|02-25-2003 06:28 PM|
|dirtlmfan||ZTOY: Some dirt limited late model (class requiring steel block and heads) teams are getting 700-750 HP out of their motors using the iron eagle heads. These are probably the 230 angle plug head with a lot of angle milling and CNC port work however. What other 23 degree iron head have you heard of producing these kind of HP numbers.|
|02-25-2003 05:12 AM|
|ztoy||So how do Dart Iron Eagle heads compare? They seem to do very well.|
|02-24-2003 05:53 AM|
Gerry hit on one major point about the fast burn heads and that's the chamber design. Flowing big numbers doesn't always equate to big horse power. The flow numbers between a cast iron vortec and a fast burn are very similar. The abilty of the fast burn to produce better swirl is it's key to better HP numbers than the vortec. The word from GM is don't mess with the fast burns chambers, all you can do is mess them up.
I've also been working on two cast head setups. One uses s/r torquers and the other uses GM 492 castings. Common sense and flow numbers would lead you to believe that the s/r's would be a better head but so far the 492's continue to make more HP on the dyno.
The moral of the story is don't get hung up on big flow numbers, the sum of the entire combination is what's important.
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