What kind of engine does a Pontiac 389 GTO have?
389 Cylinder Heads and Valvetrain Correct cylinder heads for the 1965 389 GTO are cast #77 and have 1.96″ intake/1.66″ exhaust valves. For 1966, most GTO models had a cast #093 head. California-bound GTO’s in 1966 had different cylinder heads with an internal air galley. In 1967, the 389 Pontiac engine was enlarged to 400 cubic-inches.
When did the Pontiac tripower 389 come out?
In ’65, the tripower 389 was rated at 360 HP. Pontiac discontinued the tripower in 1967 for 2 reasons that I am aware of. Primarily, GM came out with an edict that from ’67 on, the only multiple carb car would be the Corvette.
What’s the horsepower of a 1965 Pontiac GTO?
In stock trim, Pontiac rated the 1965 GTO 389ci Tri-power motor at 360 horsepower. In a properly prepared car, that was good for 14-second quarter-mile times.
What kind of engine does a GTO have?
After the manifold and carbs were rebuilt and reinstalled, the GTO engine looked, sounded and ran great. The #068 cam gives a nice lumpy idle and all the torque you’d ever need for the street. By using Pontiac Ram-Air 3 heads on the 389, standard Tri-power engine output of 360 horsepower is significantly higher.
Where can I find a 1965 Pontiac GTO?
In fact, aside from a paint job, this car retains nearly all of its original equipment! Pop the hood on this 1965 Pontiac GTO near Blairstown, New Jersey, or look underneath, and you might still think this cream puff has been recently restored! The fabulous Tri-Power induction and four-speed manual sweeten the pot.
How many horsepower does a 389 Tri Power have?
Good for 360 HP and 424 lb-ft of torque, the Tri-Power 389 won’t let you down if some poser beside you gets out of line. The original interior has never been removed, only lovingly cared for over more than five decades.
Why is the Pontiac GTO called Tri Power?
While many GM owners refer to any combination of three two-barrel carburetors as “ Tri-Power ,” Pontiac created the catchy name, so it’s 100% appropriate here. Dealer-installed air conditioning keeps you cool, though it currently needs a recharge.
Where did the original GTO 389 come from?
As usual, reader Ikey H. has a fine eye for a tasty classic, and submitted the tip on this running, driving Tiger. My automotive roots began with a GTO; it all started with a ride home from the hospital of my birth, also in New Jersey.
What was the horsepower of the Pontiac GTO in 1965?
An optional Tri-Power version of the same engine with 348 hp was offered. Pontiac’s intention was to use the GTO to maintain its high-performance image after the racing ban. A good job was done of this. By 1965, the Tri-Power GTO was up to 360 hp.
What’s the WOT timing on a Pontiac 389?
An LS1 engine was checked for idle timing & found to have 22 initial. Considering the modern, fast burn chambers & the WOT timing of around 28 deg, it is a considerable amount of initial timing. Also, for decades racers who ‘locked out’ their dists found as a side benefit that they had a smoother & cleaner idle.
Why was the Pontiac GTO tri power so special?
The GTO with Tri-Power was not destined to be just another 2-door high performance car. Its well-executed styling combined with an impressive quarter-mile time (under 15 seconds) also contributed to its popularity. Beginning in 1964, all first generation models were fitted with a 389ci V8 and had a compression ratio of 10.75:1.
What was the horsepower of a 1966 Pontiac GTO?
The top 400-cid V8 was a four-barrel edition for the GTO that had the same 360-hp rating as the previous year’s 389 Tri-Power version. Likewise, the top 428 carried the same 376-hp rating as the 1966 Pontiac 421 Tri-Power motor.
When did the Pontiac 389 V8 come out?
The Pontiac 389 V8 was first introduced in 1959 and would become one of the most popular engines of the muscle car era. The engine evolved from the Pontiac 370 in which the stroke was increased.
What should the timing be on a Pontiac V-8?
It’s an excellent piece that’s ideal for tailoring vacuum advance to provide peak engine efficiency at idle and part throttle. I recommend it above all others. For a naturally aspirated Pontiac V-8, I recommend a base (or initial) timing anywhere between 10 and 15 degrees.
What kind of timing gear does a Pontiac 389 have?
The OEM cam timing gear from the factory was nylon coated and the coating would become hard and flake off at around 30k to 40k miles.