1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Adaptor to mate a 12A intake on 13B 4 or 6 port???

Old 01-10-06, 09:04 PM
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Adaptor to mate a 12A intake on 13B 4 or 6 port???

Ive searched and searched and emailed all companies listed in ancient threads on this forum and google. No one seems to curently carry this item anymore. I have a newer YAW carb and modified manifold for 12A, but my 12A has sprung a nasty dowel pin leak so i want to upgrade to a 12a half-BP or 13B setup. Does anyone have any idea where i might still be able to get one of these adaptors? Thanks

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Old 01-10-06, 09:22 PM
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take an intake manifold gasket for a 12a and also one for a 13b to a machine shop and explain to them what you need. shouldn't be a big deal.
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Old 01-11-06, 12:50 AM
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contact Johnny @ powerhouse engineering (aka mazda comp). I bought one from him years ago to install a 12-A IDA to 13-B 6port. It was $150 for the adapter plate
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Old 01-11-06, 03:13 PM
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Originally Posted by wackyracer
contact Johnny @ powerhouse engineering (aka mazda comp). I bought one from him years ago to install a 12-A IDA to 13-B 6port. It was $150 for the adapter plate
Thanks for the info, i did get an email back from him a few days ago, they apparently no longer make this item. Anyone else guys???
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Old 01-11-06, 05:10 PM
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I've seen them pop up on ebay once in a great while. Have you posted a wtb in all of the forums?
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Old 01-11-06, 08:30 PM
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What is YAW carby? You can get aaptor plates for most applications easily here in Australia. If you don't have luck anywhere else PM me and I'll help you out.

13 BEEF
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Old 01-11-06, 08:46 PM
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i have an old 4 port 13b intake that i think will fit a nikki. if your interested pm me and i can check it out and send you pics.
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Old 01-11-06, 09:32 PM
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Try tweakit performance. Theyre in Austrailia though!


Good luck, Ed
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Old 01-12-06, 03:39 PM
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i searched forever to try to find an adapter to fit the 12a intake on a 4 port, you wont find it. i did find a place that sold an adapter to fit the 12a on a 6 port 13b. im not sure what the site was. i just used search engines, a lot.
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Old 01-12-06, 03:57 PM
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Originally Posted by aws140
i searched forever to try to find an adapter to fit the 12a intake on a 4 port, you wont find it. i did find a place that sold an adapter to fit the 12a on a 6 port 13b. im not sure what the site was. i just used search engines, a lot.
They are out there, I have one on a 76 13B, I just dont want to sale it.

I could take it off and get some made or trace it out.


I bet if you asked Billy he would make a run of them.
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Old 01-12-06, 04:40 PM
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how do these fit up on the block? wouldn't the manifold get in the way of the bolts that hold the adaptor plate to the engine? i can see how the ports would line up and work, but the mounting is confusing me... could someone enlighten me?
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Old 01-12-06, 04:47 PM
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I think mine just has holes through it, the studs are long enough to go all the way through the mani and still bolt on correctly.
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Old 01-12-06, 05:28 PM
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I have a 12A mani to 13B 4port motor adapter. I'm pulling my carb this weekend if you're still in a jam I'll take it to the machine shop and have them copy it...? Just PM me.

It's about 1 inch wide and the bolts used to attach the adapter to the motor are recessed so the head sinks into the adapter plate. Then the mani bolts to the adapter using it's own threaded holes. Being the patterns are different they don't interfere with each other. The ports are off so as they pass through the adapter plate it's on a slant to meet up correctly at the other end.
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Old 01-12-06, 05:31 PM
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I misread the type of motor. As stated in prior post, use the old 4port intake and drill/tap new studs on top to mount a 12-A carb. I cant find my other pix of 13-B manifold with modded RX-2 carb.

Pix of adapter just for ya FB II. Old pix but hey, this will give ya the idea. ALl are allen head bolts except for center, I used long-studs

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Old 01-12-06, 09:02 PM
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this is a pice of a 12A to a 6 port 13B. This one is no longer available. I would probably be putting my Yaw (12A intake) on a 4port TII block.
Attached Thumbnails Adaptor to mate a 12A intake on 13B 4 or 6 port???-imageto5.jpg  
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Old 01-13-06, 12:48 AM
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Sorry I can't get a griip on this subject. Are you trying to put a 12a intake system and/or carb on a 13b??? If so, why???

I put a 13 b carb (RX-4/Cosmo) on a ported 12a motor and got good results. I made the adapter myself, with only a drill press. I used two of the thick phenolic spacers from the RX-4 and epoxied the whole thing to a 12 intake manifold, then used a die grinder to blend the passages.
Attached Thumbnails Adaptor to mate a 12A intake on 13B 4 or 6 port???-12amanifold-.jpg  
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Old 01-16-06, 04:36 PM
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hey wacky found out from the guy at powerhouse that they discontinued the adaptors i think i might have to go threw kgparts hes the guy that carries projay stuff too
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Old 01-16-06, 05:15 PM
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How thick is that spacer? I was thinking about fitting my wrap around 12a weber intake to a 13b. I could make something like that if I hear flow isn't hurt much by not using a 13b wrap around intake.
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Old 01-16-06, 06:32 PM
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The last adapter plate I picked from johnny @ powerhouse was 12-A 48 IDA intake to GSL-SE 6port. But that was about 4 years ago. The other source is Nick @RR&R but Im not sure if they are still available. (Nick originated with the adapter plate when he used to sell the mikuni aggressor kit).


I will check the size later. Also, if there is a need for this, contact Billy @ RESpeed. He can lend him the my adapter plate if needed.
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Old 10-25-14, 01:23 PM
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Intake adptor plates rotary

Originally Posted by WankelingBeer View Post
Thanks for the info, i did get an email back from him a few days ago, they apparently no longer make this item. Anyone else guys???
I dont know how old this post is but you can buy them at racecast.com there in Austrilia I think but check out web site..I got one from them 12a to 13b 6 port.
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