DeTomaso Mailing List: April 2000, Message #303

The F351-4V was designed by Edelbrock with the aforementioned port mismatch.  It is designed to promote port velocity for increased low end torque for normal street driving (as eluded to by the illustrious Jack DeRyke).  But I do disagree on his statement that the engine would be limited to 5200rpm.  When I used the F351-4V on my otherwise stock engined 74 Pantera, it would rev to 5900rpm (at least until the valve springs started to go).

I also don't think it is the same port size as on a true 2V manifold, I think it is somewhere in between the two extremes.

I still have the F351-4V, and while it still revs up to 6000rpm, I'm not exactly happy with the performance.  I think the port plates that I installed during the last rebuild are not working right with this manifold.  I am currently considering removing the intake port plates (leaving the exhaust port plates).

 Craig Cline
   1974 Pantera #7352   - the Green One      San Diego, California
   1969 Shelby GT-500   - the Red One        E-mail: Craig.Cline@trw.com
   1967 Trans-Am Cougar - the Fast One       Work Phone (858)592-3423
   1995 Mustang GT      - the Daily One      Home Phone (760)634-3580
   1997 Expedition      - the Wife's Bus


-----Original Message-----
From: FlyinRider@aol.com [mailto:FlyinRider@aol.com]
Sent: Saturday, April 08, 2000 5:58 PM
To: Multiple recipients of list
Subject: Fwd: Help cleveland manifold question



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From: FlyinRider@aol.com
Full-name: FlyinRider
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Date: Sat, 8 Apr 2000 14:44:36 EDT
Subject: Help cleveland manifold question
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OK help please.  Just pulled the edelbrock "F351-4V" manifold off to polish 
it.  But the port size difference between the two jumped out and bit me.  Got 
out the vernier caliper and measured the two.  The heads are big 2.5" x 1.75" 
 and the manifold measured in at 2.15" x 1.38" I always was taught to port 
match the two.  I am assuming that edelbrock may have left some material on 
to match with hence the funny numbers.  But when I looked up in the edelbrock 
catalog they don't list manifolds for the different size port selection of 
the different Cleveland heads?  If it wasn't Saturday I would call them to 
find out.  Anyone have this dilemma before?  Help looks like IM going to have 
to break open the wallet again.

thanks john 6377

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