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The RPM Air Gap manifold is a consistent winner in every magazine's manifold dyno shootout I have ever read. It always has the widest power band and most power "under the curve" of any manifold of any type - always. I selected it hoping for a top end boost while keeping the low end torque my low stall speed converter requires. I figured it'd be a slam dunk for my Nova. Now I'm not so sure.
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The ZZ502 has
oval port heads. But these ports are much wider than the usual
399-454 oval ports. They are about 0.100 wider and squarer in
the corners. Except for the corners this photo of a FelPro oval port gasket behind the ZZ502's intake gasket does not show the total difference . The FelPro gasket is very generous over the port while the ZZ502 gasket is true to the ZZ502's port. |
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I did quite a
bit of cutting to port match the Air Gap manifold to the ZZ502's
head ports. The runner's in the ZZ502's stock intake manifold are larger than the Air Gap's runners. I'm concerned that the Air Gap may not deliver the magic it is known for. |
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Here's the gasket on the ported RPM Air Gap manifold. |
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Again. |
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Here's the gasket on the ZZ502's head. |