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05-31-2011
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Ported intake
Ported IH, these are stage I and are 36MM at the surface....they progressively move down to 33mm at the bottom of the IH on the primary and on the secondary they are 36MM. The injector bosses have been removed.
Both IHS are done I will do the plenum this week...paint the plenum and IHs Cost is $450 I can open to 36mm straight through for $700 **All prices are with you giving me your IHs and Plenum in exchange.. **Shipping is extra If you need them installed and are in driving distance to Chicago, I can put it on for a reasonable price.....gaskets at your cost.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-31-2011
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#2 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported intake
Unported stock: These can neck down to as small as 31mm at the head face
 Stage I port same runner: I make sure its a true 33mm at IH to head face on primary 
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-31-2011
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#3 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported intake
Stock IH at head mating surface, as noted they can be as small as 31mm and note the large bosses which impede air flow:
 These are stage I, I will clean these up even more, I had originally ported this for my car: 
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-31-2011
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported intake
Coolant block offs installed also
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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05-31-2011
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#5 |
Join Date: Aug 2008
Location: Houston 90 Red ZR-1
Posts: 2,320
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Re: Ported intake
That ball gage looks like a moon rock. Lol!
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05-31-2011
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#6 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported intake
That is a 35mm foose ball that has been to hell and back...covered in aluminum and WD40
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 05-31-2011 at 11:54 PM. |
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06-01-2011
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#7 |
 Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Ported intake
^^ I also purchased a foosball when I did mine...it just seems to come up on a google search if you look up '35mm ball'
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06-27-2011
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Ported intake
Well while I wait for my block work....opened these up more, and started on the plenum......checking interest...they are now 35+ down to the bosses....as big maybe bigger than the ones on my 391rwhp car.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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06-28-2011
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#9 |
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Join Date: Sep 2010
Location: Sterling, VA
Posts: 147
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Re: Ported intake
Hi:
If I might, I would like to ask some questions... What size are the ports in the head (that the IH bolts to)? Does one also want to match the IH to the Pleneum in order to maintain a constant size? What coolant block offs are installed (0r rather why)? What is the anticipated gain from this porting?
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Thanks ... Paul (Paul in VA) WAZOO Member |
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06-28-2011
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#10 |
  
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,632
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Re: Ported intake
I really need to get my car ported...just can't afford it now.
the coolant bypass is for the TB, gm put them there to run coolant into the TB to keep the plates from icing up in cold weather...but who drives a zr-1 in cold weather? the advantages are to keep the air cooler into the motor providing (possibly) more power and the ability to pull the plenum without having to dump coolant
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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