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Author
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Topic: What are "N" Heads
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ekbeanctr
Gearhead Posts: 772
From: Middlebury, IN USA
Registered: Dec 2000
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posted 02-25-2002 07:57 AM
 
I found a site that builds motors www.phpmotorsports.com and the guy talks about building a 351W stroked to 427  with "N" heads. He claims they will work better on his motor than the aluminum AFR heads. Can anybody tell me what these heads are? Thanks.------------------
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Dave_C
Gearhead Posts: 1123
From: Gadsden, Al
Registered: Aug 99
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posted 02-25-2002 08:56 AM
They are a cast iron head very similar to the World Products Windsor Sr. (some people call them Dart) heads. At first glance that's what you think they are. Same chambers, same valve location, same intake port. But the exhaust port is different. These heads use a header with an oddball bolt pattern.It has a horizontal factory-style bolt pattern with 8 bolt holes in a straight line but the center-line distance has been increased to 2 3/4". Normal SBF centerline is 2". The Windsor Sr's have two bolt patterns. 2" and 3". I have never seen any headers for a street car that will work with these heads, but here may be some. I noticed from they guy's web page that he build's circle track engines. The whole point to these heads is that some popular circle track classes have rules that require a cast iron head with a factory part # on them. The chevy guys had several "Bow Tie" cast iron heads to choose from, and Ford put these out to counter them. They have a Ford part #, but are cast by World Products. As flowing better than the AFR's. Not out of the box. The AFR heads have some good port work out of the box and flow well. The N/Windsor Sr can be made to flow very well with just a little work, but the castings are a little rough when new. The good thing is the potential. The AFR's are prob at close to max flow when you buy them, but the cast heads can flow more with work and they are cheaper. Later, David Cole
[This message has been edited by Dave_C (edited 02-25-2002).]
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 02-25-2002 03:22 PM
Ditto on what Dave says about the "N" heads and rules. The same goes for certain NMRA classes. The heads "MUST" have a factory casting number. They are basicaly Dart heads with FoMoCo numbers cast in them.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 02-25-2002 10:05 PM
Several years ago the N head was a World Products head, but now it is something completely different. (part#M6049-N351) The current design was developed by Robert Yates, and has good intake and excellent exhaust ports. Valve angles have been changed from 22 to 10 degrees, and they require special offset rockers. I haven't seen any of these heads on drag stuff, but they are extremely popular in circle track------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
http://www.rustang-racing.cityslide.com/contents/contents.cfm/712231
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TomP
Gearhead Posts: 6376
From: Delta BC Canada
Registered: Dec 99
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posted 02-26-2002 03:49 PM
are these heads supposed to be an equal to the Pro Action 14 degree Chevy heads that Sprint cars and Jr fuelers use?
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Moneymaker
Administrator Posts: 29200
From: Lyons, IL, USA
Registered: May 99
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posted 02-26-2002 05:34 PM
I was referring to the 302 "N" head. ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator and 69-70 a$$ kicker NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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Rustang
Gearhead Posts: 880
From: Clarion PA
Registered: Nov 2000
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posted 02-26-2002 06:07 PM
Ford Motorsport replaced the world products head with the N351 head in 1996. It is considered a "sportsman" head.
I did find an article in October 1996 Circle Track.
This head was developed for Nascar Late Model racing, so it was created around whatever restrictions this class has, so they would be nothing like PRO Action heads, they'd be closer to the Bow Tie head. Here's some flow numbers:
.200 141 98
.300 160 127
.400 212 142
.500 232 161
.600 244 169
.700 255 172
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TomP
Gearhead Posts: 6376
From: Delta BC Canada
Registered: Dec 99
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posted 02-27-2002 02:56 AM
I guess i need to get a late model Ford Motorsport (or whatever they are called nowadays) catalog![This message has been edited by TomP (edited 02-27-2002).]
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TomP
Gearhead Posts: 6376
From: Delta BC Canada
Registered: Dec 99
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posted 02-27-2002 02:57 AM
ahhh OK. The Victor Glidden head would be as close as wedge Ford heads get to the Pro Action ones, but aluminum heads not legal for Jr Fuelers. One car had Buick symetrical port heads (like in Comp Eliminator) made of cast iron, they made a small batch to meet the rules. I've heard the Pro Actions will flow around 400cfm maxed out 
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