When did Pontiac stop using reverse flow cooling?
In 1960, Pontiac abandoned the reverse flow system in favor of “conventional” flow where cooling water enters the block first and cools the cylinders — then all the water flows into the heads, cools the valves, and returns via the intake manifold to the radiator.
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.
How does the Pontiac engine cooling system work?
COOLING SYSTEM CIRCULATION Pontiaccooling system uses reverse flow circulation for maximum cooling efficiency. In reverse flow, cooled water from the radiator passes first to the cylinder heads, which are the hottest parts of the engine, and then to the cylinder block which is the coolest portion of the engine.
Why did Pontiac move away from gusher flow?
Theory 1: “PMD APPARENTLY MOVED AWAY FROM GUSHER FLOW, PRIMARILY BECAUSE THE ENGINES RAN TOO COOL IN COLDER CLIMATES” Source: Rick Gonser POCI Chief Judge, Western District Director, and 50s/60s PontiacGuru That theory doesn’t (dare I say?) “hold water”. If a hotter engine is needed, why not just replace the thermostat?
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.
What kind of exhaust manifold was in 1967 Pontiac GTO?
A streamlined exhaust manifold was developed for the 1967 400 H.O. available in the GTO that model year. It was used with many other Ram Air engines over the years, as well as the 1973–1974 Super Duty 455 (shown).
When did Pontiac start using Long Branch manifolds?
These “long-branch” manifolds, as they’re commonly called, feature long individual runners like the original cast header, but its collector was an integral part of the casting, which was flanged to mate to exhaust piping. The design was compatible with all full size Pontiacs produced during the 1960s and the new Firebird introduced in 1967.
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.
Are there any problems with the Pontiac engine?
It would make sense only if Pontiacwas seeing problems with cylinders overheating in reverse flow engines when stressed.