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#1 |
![]() Join Date: Apr 2009
Location: Portland OR
Posts: 173
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Need info on Porting. Lots of Info (Links).
So what is the best set-up for a Stock engine? Is there any advantage to porting the Heads on a Stock engine? How big should the porting be? 35MM/34MM Tools, what are the best tools for this job? Die grinder bit sizes ect..? |
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#2 |
![]() ![]() Join Date: Dec 2003
Location: Grand Island NE
Posts: 1,510
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36mm and yes port the heads.
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Dennis Fierstein 90 ZR-1 #2562 Atomic-Z ZR-1 Net Registry Chairman of the Board ZR-1 Net Registry Treasurer |
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#3 |
![]() Join Date: Apr 2009
Location: Portland OR
Posts: 173
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#4 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Porting heads is a tricky piece, I have seen a few heads sent to the gods of speed due to misalligned porting....and ZR-1 heads are not easy to find and not easy to fix. Watch out for water jackets.
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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; 07-17-2010 at 11:20 AM. |
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#5 | |
![]() Join Date: Apr 2009
Location: Portland OR
Posts: 173
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#6 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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I am a big do it yourself person, but if you do not know the weak points of the head, you need to stay smaller on ports, going 35/36 is a recipe for disaster......you can damage the area under the lifter or go through a water jacket, there are some very thin spots, and even people with experience have trashed sets.
Pete is not cheap but I know he is an expert at it. I have done a lot of intakes but I would not wander down a head port without a guide to help. Be careful.....
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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; 10-29-2016 at 05:42 PM. |
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#7 |
![]() ![]() Join Date: Dec 2003
Location: Grand Island NE
Posts: 1,510
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I actually have 396, but I had Marc do his 500 package on my car when it was a 350. 36mm porting and heads ported too. Take a look at what Marc does on his 500 package.
If you are going to do it yourself, I would error on being conservative too.
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Dennis Fierstein 90 ZR-1 #2562 Atomic-Z ZR-1 Net Registry Chairman of the Board ZR-1 Net Registry Treasurer |
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#8 |
![]() Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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I have 391 rwhp on the 92, without touching the heads, wonder if port matched with 93-95 intake cams would get you low 400s for cheaper, which is close to a 500hp package for a lot less $.
I am doing a port match on the 90 and dropping a few hundred pounds from the car, hoping to match a 500hp car performance....no AC, etc I almost traded the 90 on a Viper up in WI a month ago, but couldn't walk from the project at this time.
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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; 06-02-2010 at 10:28 PM. |
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#9 |
![]() Join Date: Jan 2009
Location: Scottsdale, AZ
Posts: 700
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1989 ZR-1 #04 Pilot, Advertising/PR Campbell-Ewald S9YKH1 1989 ZR-1 #58 LT5 only 1989 ZR-1 #74 Unreleased Production / PR Dept 9PR110 NCRS #3,182 SACC #2,420 Member Corvette Museum Corvette Forum: "ewjxn" 2009, 2010 Gathering Attendee |
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#10 |
![]() ![]() Join Date: Dec 2003
Location: Grand Island NE
Posts: 1,510
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Naw, that's my thing...Pete won't work on them if you paint them AO
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Dennis Fierstein 90 ZR-1 #2562 Atomic-Z ZR-1 Net Registry Chairman of the Board ZR-1 Net Registry Treasurer |
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