4port to 6port adapter???
 

Does anyone know if there is a simple adapter available to bolt a 4port intake manifold onto a 6port NA engine?

I could make my own but would prefer to just buy something simple if it's readily available.

Thanks!

Why would you want to do this??

I thought it was clear but I guess not.

I'm wanting to put an intake manifold made for a 4port engine on my 6port engine.

again..... WHY?

dude it does not work that way those two diffirent engines all the way down to the irons

It appears to me that the only difference is in the size/shape of the ports on the front and rear of the intake manifold. It looks to me like a simple spacer that bridges those two openings would suffice.

Is there something other than that I'm missing? I don't have a 4port engine here to test fit so I'm going by what i can see in pictures.

Isn't that about like buying a prize bull for for breeding purposes and eating his balls for a snack????!!????

Yes, there is an adapter to go from 13B 4 port to 13B 6 port..

I made 30 of them on the CNC mill back in 2004. All of them sold.. would make more if they were more in demand...

Lately when asked I just for this, I just weld the 4 port manifold up, and then re- machine it to fit the 6 port motor

In this thread:

https://www.rx7club.com/1st-generation-rx-7-1979-1985-parts-101/brand-new-13b-4-port-13b-6-port-48-idf-intake-manifolds-f-s-882061/

You can see where I took a 13B 4 port manifold and changed it to 13B 6 port...

I was playing with it the other way - I wanted to put my much-modified 6-port intake on early-style 4-port housings. (It was modified to port-match to Turbo II housings - bolt pattern is the same, but the runners are just a little different :) )

I think there might be enough metal to drill and tap, but it'd be sketchy. And of course, the port mismatch.

Thank you. This answered my question perfectly. You don't happen to have any of those carbs or manifolds still for sale do you?

if u go back and read his reply, he said all the manifolds sold. possibly why the thread is now closed.

Actually I do..

I have about 25 of the Brand New 13B 4 port IDF manifolds left

And..

I still have the one in the pics, I modified from 13b 4 port to 13B 6 port...


In regards to the 48 IDF carb, I dont have any used ones...but I do have 2 Brand New..

See the pics

The modified 6 port manifold is $350.00 Shipped

The New 48 IDF carb is........, I need to check the price on this on Monday..cant remember what I paid for them...Need to look at the invoice which is at the shop...