Gaskets Heat Riser Restrictor For Volkswagen Jetta. If you are still running the stock exhaust manifolds with a heat riser, block the heat riser it the open position. If cold starting and warm-up is not an issue, plug them up.
Exhaust heat was routed from adjacent exhaust ports to the carburetor base to provide quicker cold-weather warm-up. Category Facet Filter Expand Collapse Icon. The parts guy gave me a "Restricted" gasket, and after pulling the port riser, I see that the gasket that is currently on there is the same type.
Install new heat riser gaskets at the exhaust port and loosely bolt the heat riser tubes to the exhaust ports.
As a result of this procedure your choke operation is going to miserable.
Some merchandise may be limited in supply or available only by special order. These gaskets are the preferred choice for high vacuum applications. Fits: BBC, SBC and Ford manifolds as well.