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  '64 1/2 to '73 -- The Classic Mustang
  351C 4V or 302Boss?

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Author Topic:   351C 4V or 302Boss?
pthornton
Gearhead

Posts: 601
From: Austin, TX USA
Registered: Jun 99

posted 08-06-2002 09:56 AM     Click Here to See the Profile for pthornton   Click Here to Email pthornton     Edit/Delete Message   Reply w/Quote
How do you tell the dif between these heads?

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Boss 302 & Saleen S281

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Moneymaker
Administrator

Posts: 19751
From: Lyons, IL, USA
Registered: May 99

posted 08-06-2002 10:12 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
The Saleen has a 4.6 SOHC (single over head cam) engine and the Boss is a traditional over head canted valve configuration.

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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
Professional Manwhore
The Barry of BarrysGrrl

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Thud
Gearhead

Posts: 1087
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 08-06-2002 12:11 PM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
One difference that I've been told about is that 351C heads have the water-crossover passage on the block side of the head and Boss 302 heads have the water-crossover passage on the intake side.

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Everybody hates me just because I'm paranoid...

Dwayne

M&M Member #18
'94 Lightning #942 of 4007
'70 Mach1
2 '69 Cyclone Spoiler II's
'65 Galaxie 500 + parts car

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SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 08-06-2002 06:57 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
In addition to the water passage difference Thud mentioned, the 351C 4V does not have the adjustable valve train, such as 7/16" studs and guide plates. The Boss 351 does, however.

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All Fords since 1977!

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DidgeyTrucker
Gearhead

Posts: 1060
From: Greenbrier, TN USA
Registered: Oct 99

posted 08-07-2002 12:01 AM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
In the upper corner outside the valve cover will be a "4" if they are 351C 4V heads and a "2" if they are 351C 2V heads. BOSS 302 heads (and 400) heads are blank. 351M heads will have an "M" there.

Tracy

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SteveLaRiviere
Administrator

Posts: 33988
From: Saco, Maine
Registered: May 99

posted 08-07-2002 06:19 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I almost forgot the obvious; the casting numbers:

'69 Boss 302 C9ZE-A
'70 Boss 302 D0ZE-A
Boss 302 service replacement D1ZE-A

'70-'71 351C 4V D0AE-H and D0AE-R {closed chamber}
'71-'74 351C 4V D1ZE-DA and D1ZE-GA {open chamber}
'71 Boss 351 D1ZE-B
'72 351C HO D2ZE-A

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All Fords since 1977!

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Doyle
Journeyman

Posts: 38
From: Annapolis, Maryland
Registered: Oct 2000

posted 08-11-2002 07:48 AM     Click Here to See the Profile for Doyle   Click Here to Email Doyle     Edit/Delete Message   Reply w/Quote

Will the exhause manifolds for a 351C work
on a Boss?
My boss has headers and I am thinking of
getting rid of them and replacing them
with the stock manifolds.

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kid vishus
Gearhead

Posts: 4736
From: middle of NC
Registered: Oct 2000

posted 08-11-2002 08:11 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Doyle:

Will the exhause manifolds for a 351C work
on a Boss?
My boss has headers and I am thinking of
getting rid of them and replacing them
with the stock manifolds.


Just one question....

Why?

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Doyle
Journeyman

Posts: 38
From: Annapolis, Maryland
Registered: Oct 2000

posted 08-11-2002 09:17 PM     Click Here to See the Profile for Doyle   Click Here to Email Doyle     Edit/Delete Message   Reply w/Quote

Why you ask - it's a tad loud for
my liking. I prefer a low rumble.

Another reason - the headers stick down
pretty low. When I restore the car I want
to lower the front end. I am worried the
headers will be too close to the ground.
I would hate to find out the hard way
that they are.

So - back to my original question....
Will 351C exhaust manifolds fit?

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bossman
Gearhead

Posts: 131
From: Moreno Valley, CA, USA
Registered: Jun 2000

posted 08-11-2002 11:20 PM     Click Here to See the Profile for bossman   Click Here to Email bossman     Edit/Delete Message   Reply w/Quote
in answer to your question about exhaust manifold interchange - in a word NO. The problem is the 351C has a much larger deck height than the shorter 302. consequently, the 351C exhaust manifolds hit the starter/bellhousing on the passenger side. if you look at the C9ZE exhaust manifolds, you will see a curve built into clear the starter hump. that is why the Boss manifolds bring such a high premium......

randy

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www.bossman-motorsports.com

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