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

Compatibility question

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Old 10-24-02, 06:58 PM
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Compatibility question

Is the motor in a 74 RX-4 a 12a or is it some other motor and could I use it for my 85 GSL? foud a complete 74 RX-4 for sale thinking about grabbing it just to resale.
Old 10-24-02, 07:06 PM
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No, I believe it is the old 4-port 13B.
Old 10-24-02, 07:10 PM
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??? My 12a Is a 4 port or are you referring to the exsaust? I think? I'll have to check when I get home.

Last edited by Warlock_Sterzinger; 10-24-02 at 07:12 PM.
Old 10-24-02, 07:11 PM
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This was also the first car that Mazda sent to the US with the 13B in it.
Old 10-24-02, 07:13 PM
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No, I'm refering to the intake ports. Yes, the 12A has 4-ports, but the later 13B, cerca '83, had 6-ports.
Old 10-24-02, 07:18 PM
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so if it and mine are the same # of ports then souldn't it bolt together? I'm just trying to get my baby on the road I'm wqilling to do any thing to get it there. I just have a verry tight budget right now.
Old 10-24-02, 08:49 PM
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You need the intake manifold from the Rx-4 to work on that 13B. You can't just bolt a 12A manifold on there.
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