When did Pontiac start using high flow exhaust?
As engine displacement increased throughout the 1950s and 1960s, Pontiac began experimenting with high-flow exhaust manifolds that featured long, individual runners that merged into a large collector area to improve horsepower, particularly at high RPM.
Where can I get a reproduction of a Pontiac exhaust manifold?
At least two companies offer near-exact reproductions of Pontiac’s most famous exhaust manifolds. They continue to be a popular choice for many high-performance builds where a stock appearance is desired. They are available from most restoration parts supply houses specializing in Pontiacs for a reasonable cost.
How big is the exhaust manifold on a Pontiac Firebird?
Shorty headers fit and perform similarly to Pontiac’s Ram Air exhaust manifold. Hedman offers a D-port version in its Hedder line for GTO and Firebird models that features 1.625–inch-diameter tubing that steps to 1.75 inches to improve low-RPM torque, and 2.5- and 3- inch collectors.
What kind of exhaust manifold does a Pontiac Grand Prix use?
An abbreviated version of the cast Super Duty header was developed for Pontiac’s high-performance street applications. The “long branch” manifold fits many full-size Pontiac models from the 1960s including the Grand Prix, as well as first-generation Firebirds. RARE offers excellent reproductions with 2.5-inch collectors.
What are the symptoms of intake manifold problems?
1. Engine misfires and decrease in power, acceleration, and fuel economy. One of the most common symptoms of an issue with intake manifold gaskets is engine performance issues.
Can a leak in the intake manifold cause a bad smell?
Some intake manifold gaskets also seal engine coolant, and if the gasket wears out it may lead to a coolant leak. This may produce a distinct coolant smell, along with steam, and drips or puddles of coolant underneath the vehicle. Coolant leaks should be addressed as soon as possible, in order to prevent them from becoming a greater issue. 3.
What are the gaskets on the intake manifold made of?
They can be made of paper, rubber, metal, and sometimes a combination of the three. The intake manifold gaskets are responsible for sealing the intake manifold against the cylinder head(s). Apart from sealing engine vacuum, certain designs will also seal engine coolant.