NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   1st Generation Specific (https://www.nopistons.com/1st-generation-specific-16/)
-   -   Swapping From Gsl 12a To A 6 Port Gsl-se 13b (https://www.nopistons.com/1st-generation-specific-16/swapping-gsl-12a-6-port-gsl-se-13b-48486/)

trochoid 05-15-2005 06:55 AM

A little off topic, but several of you have suggested using the 12a end plates. I have concidered doing this, but what do you use for the intake, if going carb? I will assume S4 intake if staying FI.

Black8 05-15-2005 06:15 PM

[quote name='trochoid' date='May 15 2005, 03:55 AM']A little off topic, but several of you have suggested using the 12a end plates. I have concidered doing this, but what do you use for the intake, if going carb? I will assume S4 intake if staying FI.

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You use a Racing beat holley intake.

1revnrex 05-15-2005 07:45 PM

[quote name='Black8' date='May 15 2005, 07:15 PM']You use a Racing beat holley intake.

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... and make some good damn power I might add.

laundryhamperman 05-16-2005 03:02 PM

why is it better to use the 12a irons? and the intake is the 12a racing beat holley.....if u use the 13B rotors housings etc....won't that change the spacing between the end housings b/c the rotors are wider?

Black8 05-16-2005 04:08 PM

[quote name='laundryhamperman' date='May 16 2005, 12:02 PM']why is it better to use the 12a irons? and the intake is the 12a racing beat holley.....if u use the 13B rotors housings etc....won't that change the spacing between the end housings b/c the rotors are wider?

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12a irons are better because you can port those muthas out. the GSL-SE 6 port irons aren't as port friendly. You have to use a racing beat 13B 4-port intake.



That was my setup in my old FB. I used 12a irons, streetported, S5 rotors, e-shaft, SE housings, a bunch of other things I can't remember. I also used the racing beat intake with a 600cfm holley, with mechanical secondaries.....worked marvelously. Lots of power. it was great.

treceb 05-16-2005 06:38 PM

well im a fan of two barrel carbs so thats what went with.

laundryhamperman 05-17-2005 05:00 PM

wait...suggesting to slot the trans mount and move it back an inch to use the 12a engine mounts normally.....doesn't that move the tranny back an inch...back up into the drive shaft...moving into the rear axle...u said it worked perfectly...can you explain how please? i like you idea i just want more info..


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