[DeTomaso] Questions on 4v heads

Tue Oct 26 16:16:31 EDT 2010

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
>>>> _______________________________________________
>>>>
>>>> Detomaso Forum Managed by POCA
>>>>
>>>> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>>>>
>>>> DeTomaso mailing list
>>>> DeTomaso at list.realbig.com
>>>> http://list.realbig.com/mailman/listinfo/detomaso
>>> _______________________________________________
>>>
>>> Detomaso Forum Managed by POCA
>>>
>>> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>>>
>>> DeTomaso mailing list
>>> DeTomaso at list.realbig.com
>>> http://list.realbig.com/mailman/listinfo/detomaso
>> _______________________________________________
>>
>> Detomaso Forum Managed by POCA
>>
>> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>>
>> DeTomaso mailing list
>> DeTomaso at list.realbig.com
>> http://list.realbig.com/mailman/listinfo/detomaso
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 10.0.1144 / Virus Database: 424/3218 - Release Date: 10/25/10
>>
>>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
>