Vortec L31 MARINE MANIFOLD project! Q&A

Performance modifications, tips & tricks

Moderators: flyingpolarbear, Dev, James B.



Post by 99turbo »

A James B. were you running enough boost that you had to upgrade the MAF to get more Hz?
If so could you tell me what you upgraded to, and if I need to worry pinnouts/rewiring and such.....

OR how bout one from a 2001-02 chevy 2500 6LTR?

Any help is greatly appropriated,

Posts: 16
Joined: Sun Aug 13, 2006 7:55 pm

Post by davkenrem »

Formyboat wrote:Could somebody tell me the part number of this marine manifold preferably the lower section or where to get one and what term to use I have had no luck at all new or 2 nd hand
Thanks James
http://www.michiganmotorz.com/indmar-al ... 11195.html

James B.
Posts: 2821
Joined: Thu Apr 03, 1997 4:00 pm
Location: '98GMT400, '98GMT410, '99GMT420, '00GMT420

Re: Vortec Marine Manifold Post.

Post by James B. »

rmoschilli wrote:I am currently caught between a rock and
Hard place.

Need to talk to someone who was involved in this project.

Can somebody help me out??


Hello Rick, what would you like to know?

Posts: 5025
Joined: Tue Dec 11, 2001 4:00 pm
Location: 1997 Chev ECSB L31 350 1997 GMC Sierra SLE RCSB, Ontario

Re: Vortec L31 MARINE MANIFOLD project! Q&A

Post by Hog »

BrandonE wrote:
Tue Apr 21, 2020 3:59 pm
Well, I’m new here but used a lot of this thread to build a 406 small block with the marine intake and Black Bear Tune. Should have it going this weekend. Last couple guys had questions I could probably help with if you’re still out there. Stay tuned...
How'd it turn out?


Posts: 1
Joined: Sat Feb 24, 2018 2:45 am
Location: Washington

Re: Vortec L31 MARINE MANIFOLD project! Q&A

Post by KokaineCowboy »


Mjscheneldy, I sent you a PM in regards to the items you want to sell. Lets see if we can make a deal if you still have the items available.

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