Ads
related to: pontiac performance engines 389
Search results
Results From The WOW.Com Content Network
The XS-code 389 was still rated at 360 bhp at 5,200 rpm, same as the more common WS-coded Tri-Power 389, but performance was noticeably improved on acceleration runs. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. Whether all were installed in GTOs is unknown.
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.
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.
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]
In spite of a GM unwritten edict against engines larger than 330 cu in (5.4 L) in intermediate cars, DeLorean (with support from Jim Wangers from Pontiac's ad agency), came up with the idea to offer the GTO as an option package that included a 389 cu in (6.4 L) engine rated at 325 or 348 hp (242 or 260 kW; 330 or 353 PS).