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02-01-2010, 10:34 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
The Best Iron Heads
Is anyone using N351 Iron Ford heads on their 351's? I see that Ford has re-released a new casting with some minor changes in the combustion chamber.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 02-01-2010 at 10:56 PM..
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02-02-2010, 10:08 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Anyone????????
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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02-03-2010, 06:56 AM
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CC Member
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Join Date: Aug 2009
Location: Edinburg,
TX
Cobra Make, Engine: Everett Morrison, All aluminum small block ford.
Posts: 436
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Not Ranked
Are you looking to make more power? The gt40p head was a nice little iron head. Small combustion chamber and not bad flow numbers for a stock head.
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" If it wont break em loose in 3rd gear, it aint enough power "
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02-05-2010, 07:34 AM
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CC Member
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Join Date: Apr 2008
Location: Wasaga Beach Ontario,
ont
Cobra Make, Engine: D&D
Posts: 82
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Not Ranked
World Products
If you are looking for aftermarket iron they are about the best. I have the windsor sr on a 408 and they work . They work even better since porting and polishing.
Cheers Greg
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04-03-2010, 06:34 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
Is no one here familiar with this head?
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
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04-03-2010, 06:58 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Not Ranked
Quote:
Originally Posted by Rick Parker
Is no one here familiar with this head?
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More or less, they were designed to be a "spec" head for some of the lower tier NASCAR series around the country.......I've looked at them and the main thing I see is they need special off-set rocker arms as well as special push rods, valves too for that matter, the length is an animal all it's own........
Nothing off the shelf for a Windsor or Cleveland motor fits these heads......dats the problem, by the time you get a set ready to bolt on, you can just about buy any aluminum head you want.......
I've seen a number of the top dogs in Vintage racing are using the Roush/World iron heads, they all swear by them........
David
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DAVID GAGNARD
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04-05-2010, 10:45 AM
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CC Member
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Join Date: Sep 2008
Cobra Make, Engine:
Posts: 52
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Not Ranked
Try finding a pair iron Darts,Roush 200's or the old TFS Highport iron castings,if you really need an iron head.
Aluminum is the way to go,to run higher compression on the street,and loose front end weight.
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04-12-2010, 10:45 PM
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CC Member
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Join Date: Mar 2003
Location: Arkadelphia, AR,
AR
Cobra Make, Engine: Kirkham 427 brushed aluminum with Keith Craft 527C.I. all aluminum FE
Posts: 992
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Not Ranked
The N-heads do work well but like said above you will need the right guide plate and Ford racing makes an off-set intake roller rocker for them or you can run a shaft system which is kind of expensive for street engines. Like mentioned why don't you just do some of the aluminum heads and make it easy on yourself.
Good luck, Keith
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Keith C
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04-14-2010, 06:54 AM
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Senior Club Cobra Member
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Join Date: Aug 1999
Location: Ellington,
CT
Cobra Make, Engine: Classic Roadster 351W, T5, Red & White
Posts: 3,478
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Not Ranked
Keith, the spec and performance difference in the GT 40 ( 1.94 intake ) and the GT 40 P heads ?
..........thanks
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2014 Porsche Cayman S, 2014 M-B CLA 45 AMG,
Unkown:"Their sweet lines all but take my breath away, and I desire them as much for their beauty as for their use "
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04-14-2010, 10:41 AM
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CC Member
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Join Date: Mar 2003
Location: Arkadelphia, AR,
AR
Cobra Make, Engine: Kirkham 427 brushed aluminum with Keith Craft 527C.I. all aluminum FE
Posts: 992
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Not Ranked
Quote:
Originally Posted by Don
Keith, the spec and performance difference in the GT 40 ( 1.94 intake ) and the GT 40 P heads ?
..........thanks
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I do not think you would see much difference with either head or enough to tell. I would go with new Racing Head Ford cast iron head or the World heads if I had to have iron. We have good luck with the racing Service head and porting them to flow to 330 cfms on the intake side with a 2.100 valve.
It just depends on what you are trying to do with the engine and the power that you want to make.
Thanks, Keith
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Keith C
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