351 W head identification

351confused · February 11th, 2007, 01:05 PM

I am trying to identify my heads for a small block ford. The heads are marked D70EDC and hace holes for emissions in the ends. The head has studs with flat shoulders. How do you identify these?

mdvaldosta · February 11th, 2007, 02:00 PM

I know they're from 1977, that's about it. I'll see if I can find a place that deciphers the rest of it.

5literJeff · February 11th, 2007, 04:44 PM

According to the engine specs sheet I read off the internet the first 4 numbers break down like this:

D7 means from 1977, O=Fairlane (62-68) or Torino (69-76) ?? E=Engine

DC = I have no idea what this means.

Before 1976, the heads feature larger valves than the early 289/302 and provide a simple bolt-on horsepower upgrade (again for the early 302s I dont know if this is applicable to 302 HO's).

See http://phystutor.tripod.com/stang/engines/small.html

And http://raceabilene.com/kelly/hotrod/engine.html

I am sure there are better sites out there that can tell you more or people around here who know exactly.

Darrell · February 12th, 2007, 06:05 AM

What size are the head bolt holes? That is the easiest way to identify them and is about the only difference between 351W and 302 heads from the 70s. 351W uses 1/2" bolts and 302s use 7/16 bolts.

February 11th, 2007, 01:05 PM	#1
351confused 200 Join Date: Feb 2007 Posts: 0	351 W head identification I am trying to identify my heads for a small block ford. The heads are marked D70EDC and hace holes for emissions in the ends. The head has studs with flat shoulders. How do you identify these?

February 12th, 2007, 06:05 AM	#4
Darrell MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 5,809	What size are the head bolt holes? That is the easiest way to identify them and is about the only difference between 351W and 302 heads from the 70s. 351W uses 1/2" bolts and 302s use 7/16 bolts. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow and Harold at Furo Racecraft http://www.myspace.com/odarrellrules

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February 11th, 2007, 02:00 PM	#2
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,928	I know they're from 1977, that's about it. I'll see if I can find a place that deciphers the rest of it.

February 11th, 2007, 04:44 PM	#3
5literJeff Regular Join Date: Jul 2006 Location: Blue Ridge, South Carolina Posts: 260	According to the engine specs sheet I read off the internet the first 4 numbers break down like this: D7 means from 1977, O=Fairlane (62-68) or Torino (69-76) ?? E=Engine DC = I have no idea what this means. Before 1976, the heads feature larger valves than the early 289/302 and provide a simple bolt-on horsepower upgrade (again for the early 302s I dont know if this is applicable to 302 HO's). See http://phystutor.tripod.com/stang/engines/small.html And http://raceabilene.com/kelly/hotrod/engine.html I am sure there are better sites out there that can tell you more or people around here who know exactly.

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