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Author Topic:   newer non vortec heads??
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Dirt Maniac

Total posts: 197
posted December 10, 2001 03:10 PM
Heres my problem. Our track allows Bowtie heads but not vortec heads. The next track over doesnt allow either. I want to travel a bit more next season so I got to thinking.
what about some of the other newer style heads. Does any one have any input on these heads particulary 12554290.

14101083...87-up...350..........
14102187...87-91...305..........1.84"/1.5" valves
14102191...87-up...3501.94 1.5001 - EFI, swirl port
14102193...87-up...350
14094093...86-88...350
12554290...94-96...350 ....Gen.II, "LT1", cast iron version, used on "9C1" Police package, Impala SS, Cadillac Fleetwood, Buick Roadmaster reverse flow cooling

sdhnc29
Dirt Freak

Total posts: 467
posted December 10, 2001 09:55 PM
If you can't use the Bowtie heads , Vortecs , or any aftermarket head ,then I'd probably use the 492 castings . You will have to get these directly from a GM Performance warehouse , or perhaps your GM dealer . On my flow bench , the 492's in stock form , out flow all of these ; 041 ,041x,462,461,291,292, and pretty much every other non-Vortec head I've flowed . You can eliminate the 305 castings , and the swirl port heads from your list , they are junk . The other castings that you mentioned , I've never had on the flow bench , so I can't offer my opinion , but I doubt if they are too good .

Donnie Ross
Dirt Maniac

Total posts: 109
posted December 14, 2001 08:02 PM
I think you could be wrong about 492s outflowing 292s thes heads were designed precisely because the 492 could not flow enough air for pro stock small blocks in the 70's the have a lot more potential for porting, in fact iron eagles are based on the 292 angle plugs.

sdhnc29
Dirt Freak

Total posts: 467
posted December 14, 2001 08:56 PM
Actually , you have your facts backwards . The 3917292 , is a 1968 camel hump head , which is the one I was referring to (should have made myself clear ). The 3991492 , is a 1970 and up , over the counter head , that is or was , available with angle plugs . The 292 head , as stated before , is inferior to the 492 ! I have flowed both head castings in the past , and I have seen this for myself . Now , the 340292 , is what was called the Turbo head . It was an over the counter head as well , and available as an angle plug head . The main draw back to it , is that you will probably never find one that has been used and not cracked (they crack coming out of the intake seat , into the chamber , and go straight for water ). While it was a good head , it's very rare to find a good set .

The Dart Iron Eagle and Pro 1 heads were designed using much of the knowledge obtained by Dart with there 220 aluminum heads , and there raised runner 220's . When it comes to a ,"as cast" head , they are hard to beat for quality and price . Feel free to call me , I'm a Dart Ware House dealer , and I can sell to you cheaper than mail order !!!

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

[This message has been edited by sdhnc29 (edited December 15, 2001).]

Donnie Ross
Dirt Maniac

Total posts: 109
posted December 17, 2001 07:07 PM
didn't know there were two different heads with the same last 3 numbers, sorry the ones
I was refering to were the "turbo" heads.
you sure are right about the cracking mine are now doorstops.wich is better iron eagles or sportsman, i got my info on the design from an old stock car interveiw and test on the iron eagles when they came out

sdhnc29
Dirt Freak

Total posts: 467
posted December 17, 2001 09:37 PM
By far and away , the Iron Eagles will be your best bet ! The sportsman head was awesome when it originally came out , but the Iron Eagle is an actual race head right out of the box . If a guy is on a limited budget , the Eagles will work just fine when you take them out of the box , much better than the sportsman head . Oh yea ........ And good luck ever cracking one (Eagle or Sportsman)!!!! The only draw back is there weight . But how often can we have our cake , and eat it too ??

The Turbo heads that we were talking about were **** good heads for a stock type casting . We used to use them back in the late 70's and early 80's quite a bit . But the cracking problem was ridiculous ! I'll bet we had a whole building full of boat anchors at one time ! Heck , you'd have 40 hours worth of port work that would only last for a limited time ............ kinda got expensive for the racer .

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780

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