12a manifold
You can't go wrong with a Sterling. And actually, the cost is less than half that of a Racing Beat Holley carb setup. The Sterling carbs are stripped of all the BS that you don't need. Go to www.sterlingmetalworks.com and take a look at one. It is a great way to simplify your engine bay too (I only have two vacuum lines, including the one to the brake booster). If you want an idea of how they perform, just check out my videos. I've never lost a race due to lack of horsepower. 

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Turblown
Group Buy & Product Dev. FD RX-7
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Mar 21, 2018 11:19 AM
heywier427
Naturally Aspirated Performance Forum
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Sep 11, 2015 04:49 PM



nice catch. That sucker will probably outflow any Mazda 12A stock manifold. Everytime they added emissions crap to them they ended up restricting flow. Id keep that as a good base for your project.
