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.

To do it right, you need to add material under the runners, then port.

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

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?

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.

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.

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: