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Old 02-15-2007, 05:07 PM   #1
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is it possible to port your own manifolds what all do they do to acomplish this. I was thinking of getting a spare set and trying it but i need some feedback.
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Old 02-15-2007, 05:27 PM   #2
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To do it right, you need to add material under the runners, then port.
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Old 02-15-2007, 06:57 PM   #3
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It should be added that you need to strap that manifold to a large chunk of metal before adding material so you do not warp it. Unless you have access to welding and machinist tooling..it is probably not easy
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Old 02-16-2007, 01:11 AM   #4
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I just did mine, the hardest part is acctualy welding them, the diegrinder makes quick work of the inner welds


now all i need to do is get them coated... not to hijack since this will apply to you soon, What is the best thing to get them coated with?
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Old 02-16-2007, 06:44 AM   #5
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Please keep in mind that PeterG'* Series I motor has significantly different manifold than your Series II motor. His are nearly a header to begin with while your front is only a large restriction and much harder to port than a Series I.
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Old 02-16-2007, 10:55 AM   #6
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ok are the seies I manifols usible on the series II at all. I know I shoul prob drop the 400 or so on a set but like doing hands on work.
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Old 02-16-2007, 11:04 AM   #7
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No, the port sequence and spacing is different.

Your heads and manifolds are like this:
E,I,E,I,E,I
(exhaust,intake,exhaust,intake,exhaust,intake, left to right).

Series 1 has the same sequence as the Buick Grand National (and all earlier 3800'* before 96):

E,I,I,E,I,E

So if you look at the Series 1 exhaust runners as they exit the head, there'* a smaller gap on the front bank between runner 1 and 3 than there is for 3 to 5. They won't even bolt up to your car.

It would probably be cheaper to modify the S1 manifolds to fit your car than it would be for headers, but PEM'* made for your car would be cheaper.

Here'* a pic of Series 1 manifolds to show the uneven port spacing:
Name:  em15.jpg
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