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The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368 hp (160 to 274 kW). The 389 was the standard engine for the Pontiac Grand Prix and Pontiac Bonneville and installed in the Pontiac GTO through 1966.
The Trophy 4 engine is a short-stroke, 45-degree inclined [4] inline four created from the right bank of the 389 V8 for the debut of the Tempest in 1961. Its 194.43 cu in (3.2 L) displacement is precisely half of the 389, with an identical bore and stroke of 4 + 1 ⁄ 16 in × 3 + 3 ⁄ 4 in (103.2 mm × 95.3 mm).
The 389 and 421 cubic-inch V8s received a number of revisions including thinner wall block castings. The standard engine for Catalina models is the 389 two-barrel rated at 256 hp (191 kW) with base three-speed manual transmission and 8.6 to 1 compression or 290 hp (216 kW) with Turbo Hydramatic transmission and higher 10.5 to 1 compression.
Engine options remained unchanged from the 1964 model year, with a 389 cu in (6.4 L), 333 hp unit being standard, equipped with a Carter AFB 4-barrel carburetor. A 421 cu in (6.9 L) engine was an optional upgrade. Both engines had choices of Tri-Power multi-carburetion setups and higher compression ratios. [15]
Introduced in 1963 on Pontiac's 389 and 421 cu in (6.4 and 6.9 L) drag racing engines, General Motors fitted it to the 1967 Z/28 before they used it on the L88 427 cu in (7.0 L) Corvette. It eliminated the production breaker-point ignition allowing greater spark energy and more stable ignition timing at all engine speeds including idle.
A new engine replaced the 326. This new engine was based on all existing Pontiac engine architecture and used the 389, 400, and 326 engines' crank at 3.75" stroke, and expanding the 326's 3.72" bore to 3.875" to give 353.8 cubic inches. It was marketed by Pontiac as a 350.
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The engine was a 195 cubic inch (3.2 L) straight-4 [7] marketed as the "Trophy 4," derived from the right cylinder bank of Pontiac's 389 cubic inch "Trophy 8" V8 engine. [8] The Tempest featured a drivetrain with a rear-mounted transaxle [ 9 ] that was coupled to a torque shaft arcing in a 3 in (76 mm) downward bow within a curved, longitudinal ...