[DeTomaso] Questions on 4v heads

Tue Oct 26 18:02:09 EDT 2010

That works. :)

Quoting detomasoregistry at gmail.com:

> Sorry Asa Jay,
>
> I guess I had not moved the new file over to the public server, it   
> is available now, I
> just tested the page with my typical-user account.
>
> Chuck
>
>
>
> Sorry, that link is being denied as under construction.
>
> I found mine though:
> Exhaust:
> http://www.351c.info/gallery2/v/asajay/351C_Build_2001/exhaustportplate.jpg.html
>
> Intake:
> http://www.351c.info/gallery2/v/asajay/351C_Build_2001/intake_portplate_before.jpg.html
>
> Asa Jay
>
> Quoting detomasoregistry at gmail.com:
>
>>
>> For pictures of both (steel) port plates, and (brass) port stuffers see:
>>
>> http://www.provamo.com/Members/TechInfo/PortPlates.asp
>>
>> Chuck
>>
>>
>>
>> In my case, they were the port "plates," not individual port stuffers.
>> They look like stamped steel intake gaskets with big tongues sticking
>> into the ports.  I used copper-coat seal against the head side and
>> regular printo-seal intake gaskets on the intake side.  I can't say I
>> don't have any leaks, but I don't think I do.  I have some photos
>> somewhere, I just can't find them.
>>
>> Asa Jay
>>
>> Asa Jay Laughton, MSgt, USAFR, Retired
>> &  Shelley Marie
>> Spokane, WA
>> ******************************
>> http://www.racingagainstautism.com
>> http://www.teampanteraracing.com
>>
>>
>> On 10/25/2010 18:00, wkooiman at earthlink.net wrote:
>>> You guys didn't mention the negatives.
>>>
>>> The intake port stuffers can come lose and cause damage or at a
>>> minimum, block flow and
>> cause you to have to take it apart to fix.  Is it likely?  Probably
>> not, but it's
>> something to worry about.
>>>
>>> What about leaks?  I don't know how well these things fit.  Can
>>> they cause intake
>> manifold or header leaks?  I don't know.  Maybe.
>>>
>>> What about hurting performance?  It's possible that these devices
>>> will hurt performance.
>>>
>>> I honestly don't know if these are valid concerns.  If it were me,
>>> though, I'd focus on
>> the easy/proven horsepower techniques.  You will never feel 10-20hp  
>>  with your
>> butt-o-meter.  You WILL feel pain if a 20hp gadget fails.
>>>
>>>
>>> -----Original Message-----
>>>> From: cengles at cox.net
>>>> Sent: Oct 25, 2010 1:07 PM
>>>> To: JDeRyke at aol.com
>>>> Cc: detomaso at realbig.com
>>>> Subject: Re: [DeTomaso] Questions on 4v heads
>>>>
>>>>
>>>> Dear Jack,
>>>>
>>>> About twenty years ago I used MPG intake and exhaust port plates.
>>>> While I thought that
>> they made more power, that was mostly a hope and a guess and it was
>> never measured. In my
>> review of exhaust port plates, they are usually described as
>> improving exhaust flow and
>> they usually *imply* improved power, but I could never find any dyno
>>  evidence of actual
>> benefit.
>>>>
>>>> Recently Dan Jones' Great 351C Dyno project actually tested the
>>>> MPG Stinger Port
>> "plates". They are bronze and have a solid tongue or stinger of
>> brass that sits low on the
>> floor of the exhaust port. Dan's dyno testing showed (I am going on
>> memory here and I have
>> slept since he posted it) only about 5 horsepower improvement. It
>> was way less than 20 hp.
>>>>
>>>> I think that properly used with a complimentary intake manifold
>>>> and cam, intake port
>> stuffers can give an honest 20-30 hp. I think that the HP benefits
>> with the exhaust port
>> stuffers is much more modest. [....but five hp *is* hp....]. Cost
>> per the MPG website is
>> $90 for a set of intake&exhaust stainless steel port plates and $175
>>  for a set of Exhaust
>> Stinger Port Plates. Again, as I glanced at the website they allege
>> 20 hp and 20 ft-lbs
>> improvement with their steel set, but not dyno sheets are shown nor
>> provided...........
>>>>
>>>> Warmest regards, Chuck Engles
>>>>
>>>>
>>>> ---- JDeRyke at aol.com wrote:
>>>>> In a message dated 10/25/10 7:19:04 AM, dave at damardirect.com writes:
>>>>>
>>>>>> Hi Jack,
>>>>>> What is your opinion on exhaust port plates? W/o intake port stuffers?
>>>>>>
>>>>> Never actually used either; I got lucky in 1990 and found a lightly used
>>>>> pair of SVO aluminum heads that already had closed chambers, adjustable
>>>>> valvetrain and raised ports. Generalizations are worth what you
>>>>> pay for them ($0
>>>>> here), but my understanding on 351-Cs is,
>>>>> 1)- intake port stuffers can make maybe 20-30 bhp extra (~10%) on a real
>>>>> 350+bhp engine, at some rpm levels, depending on the intake&    
>>>>> carb they're
>>>>> paired with.
>>>>> 2)- Exhaust plates do less than intakes but can pick up maybe 10-20 more
>>>>> bhp (~3-5%) on a real 350+ horse engine, again over certain rpm
>>>>> levels. Lots
>>>>> of caveats- including starting with closed-chamber iron heads, semi-equal
>>>>> length headers and more open exhausts than stock Ansas. There are
>>>>>  2 designs I'm
>>>>> aware of: cast-stainless or cast-bronze to take the heat, and   
>>>>> are bolt-ons
>>>>> between the heads and header flanges, not welded, pinned or glued.
>>>>> Port plates are Band-Aids for head design problems. Both intake   
>>>>> or exhaust
>>>>> plates need replacement or at least tuning of other engine parts for most
>>>>> drivers to even notice them except that they may change the
>>>>> exhaust note. A
>>>>> couple of vendors sell these; I'd call around and ask them what
>>>>> effect they've
>>>>> seen on something like your engine- and have a parts list handy
>>>>> 'cause they
>>>>> will ask whats in there. FWIW- J DeRyke
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