[DeTomaso] Mismatched Intake and Head Ports

Asa Jay Laughton asajay at asajay.com
Sat Feb 13 10:37:03 EST 2016


Sorry to be the bearer of bad news there... those heads do NOT appear to 
have been ported.
Asa

Asa Jay Laughton - W7TSC, MSgt, USAFR, Retired
&  Shelley Marie
Spokane, WA
******************************
http://www.racingagainstautism.com
http://www.teampanteraracing.com
http://facebook.com/racingagainstautism


On 2/12/2016 11:20 PM, Mike Becker wrote:
>     Yes, that could be an explanation.  When I bought the car (15 or so
>     years ago), it was fitted with a Webers setup.  They may have
>     port-matched the heads to the Weber intake.
>
>     mike
>
>
>
>     From: Ken Green [mailto:kenn_green at yahoo.com]
>     Sent: Friday, February 12, 2016 11:08 PM
>     To: Mike Becker<mikebecker679 at gmail.com>; 'Mike Drew'
>     <MikeLDrew at aol.com>
>     Cc: detomaso at poca.com; David Briggs<d.briggs at cox.net>
>     Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
>
>
>     Maybe the heads were ported?
>
>
>     Ken
>     _______________________________________________________________________
>
>     From: Mike Becker<[1]mikebecker679 at gmail.com>
>     To: 'Mike Drew'<[2]MikeLDrew at aol.com>
>     Cc: [3]detomaso at poca.com; David Briggs<[4]d.briggs at cox.net>
>     Sent: Friday, February 12, 2016 9:27 PM
>     Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
>
>     ok, maybe I am nuts.  But the ports  are way bigger in the heads.
>     Almost
>     half an inch taller and quarter inch wider.
>     I've attached 2 pictures.  When you look at the picture with the gasket
>     sitting on the intake manifold, it looks good, the size matches.
>     Excuse my
>     artwork, but on the picture of the gasket on the head, I've highlighted
>     with
>     yellow the approximate area behind the gasket where there is nothing,
>     just
>     the open port.  So fair enough, along the sides, it's only about one
>     eighth
>     of an inch on each side, no big deal.  But along the top and bottom,
>     that
>     means there will be very little gasket material sandwiched between the
>     head
>     and the intake.  My fear is that the thin strip of gasket material will
>     blow
>     out again, just like the last set of gaskets.
>     mike
>
>     -----Original Message-----
>     From: Mike Drew [mailto:[5]MikeLDrew at aol.com]
>     Sent: Friday, February 12, 2016 8:42 PM
>     To: Mike Becker<[6]mikebecker679 at gmail.com>
>     Cc:<[7]detomaso at poca.com>  <[8]detomaso at poca.com>
>     Subject: Re: [DeTomaso] Mismatched Intake and Head Ports
>     Mike,
>     You're a spaz. :)
>     Boss 351 heads and standard 4V 351C heads are identical, except that
>     the
>     Boss heads come from the factory with machining in the rocker arm mount
>     area
>     so they can accommodate adjustable rockers, because the Boss came with
>     solid
>     lifters. The rest of the head, including the intake ports were
>     absolutely
>     identical.
>     Now, it's possible that at some point somebody decked your block, which
>     lowers the heads and alters the relationship between the intake and the
>     heads. Normally the intake is machined accordingly if a bunch of
>     material is
>     taken from the block. The heads are not only lower, but also closer
>     together
>     since they move closer to the centerline of the engine as they are
>     moving
>     down. So the bottom of the intake may need to be machined to allow it
>     to fit
>     properly.
>     Could that explain the mating problem you are seeing?
>     Mike
>     Sent from my iPhone
>     On Feb 12, 2016, at 20:24, "Mike Becker"<[9]mikebecker679 at gmail.com>
>     wrote:
>     >   Hey Gang,
>     >
>     >   I've just torn down my top end on my Pantera because the intake
>     >   manifold gaskets were completely destroyed.  They were the so called
>     >   self-destructing Felpro Print-O-Seal / Print-O-Leak gaskets.  Only,
>     I
>     >   see now what the real problem was.  I went to fit my brand new
>     >   Edelbrock gaskets and there's no way they'll work! It turns out I
>     have
>     >   BOSS 351 heads and a Cleveland intake!  This undoubtedly contributed
>     to
>     >   the early demise of the old intake gaskets.  because in the
>     mismatch,
>     >   there are several places where there is minimal surface contact in
>     >   order to sandwich the gasket.  The result is that the gasket isn't
>     held
>     >   in place for long.  While the engine was still assembled, there were
>     >   places where the entire blue stripe on the gasket material was
>     >   completely exposed, i.e. not sandwiched between the intake and the
>     >   head.  See attached photos for the results.
>     >
>     >   So, now what do I do?
>     >
>     >     - Switch to aluminum heads for a couple of grand (can't really
>     afford
>     >   it)
>     >
>     >     - get a BOSS intake (can't seem to find one, they all look like
>     >   windsor intakes, except for one NOS unit for 3 grand!)
>     >
>     >     - fabricate home-made gaskets
>     >
>     >   I saw some nice original BOSS 351 iron heads on ebay for $2500.  Are
>     >   they really worth that much?  If so, mine are still very fresh,
>     maybe I
>     >   could sell them to fund a set of Trickflow aluminum heads.
>     >
>     >   Somebody please help me before I blow a gasket!
>     >
>     >   thanks,
>     >
>     >   Mike Becker (San Diego)
>     >
>     >   1741
>     >
>     >   <<...>>  <<...>>
>     >  <passengerside.jpg>
>     >  <driverside.jpg>
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> References
>
>     1. mailto:mikebecker679 at gmail.com
>     2. mailto:MikeLDrew at aol.com
>     3. mailto:detomaso at poca.com
>     4. mailto:d.briggs at cox.net
>     5. mailto:MikeLDrew at aol.com
>     6. mailto:mikebecker679 at gmail.com
>     7. mailto:detomaso at poca.com
>     8. mailto:detomaso at poca.com
>     9. mailto:mikebecker679 at gmail.com
>    10. mailto:DeTomaso at poca.com
>    11. http://poca.com/mailman/listinfo/detomaso_poca.com
>    12. mailto:DeTomaso at poca.com
>    13. http://poca.com/mailman/listinfo/detomaso_poca.com
>
>
>
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