351m head mods.

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Sep 11, 2007 | 05:08 AM

#16

MBDiagMan

Cargo Master

Joined: Dec 2004

Posts: 2,232

Likes: 3

From: NE Texas

I am under the belief that the later 351M/400 heads are the very same as the early, open chamber, 351C 2V heads.

Sep 11, 2007 | 01:47 PM

#17

johnboy427

Posting Guru

Joined: Jan 2005

Posts: 1,299

Likes: 2

From: The Vieux Ford, Kansas

No they are a little differnet my D1 2v cleveland heads don't have the smog passages just the heat cross over mabey the diffrences go further I'm not sure.
-Johnboy

Sep 11, 2007 | 05:08 PM

#18

2classics

Thread Starter

Elder User

Joined: Aug 2004

Posts: 620

Likes: 1

From: NE Wisconsin

335 series heads:

2v
open chamber 2.05int 1.715exh valves small ports
70-74 351c 70-81 400 75-85 351m

4v
quench camber 2.198int 1.715exh valves large ports
70-71 351c

Boss 351
quench chambers 2.198int 1.715int valves large ports
71 351 Boss

Cobra Jet
open chamber 2.198int 1.715exh valves large ports
71 cj 351 72-74 351c 4v

High Output
open chamber 2.198int 1.715exh valves large ports
72-74 HP 351c 4v

Kind of hard to find cobra jet or highpo heads. I'll keep looking though!!