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The W72 offered many improvements over the standard L78 400 Pontiac. One of the key upgrades were the 6x4 heads. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression.
The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the ...
The article is off on the 301 as well the 1979 pontiac grand am also came with a 301 with a hearst 4 speed shifter in some editions. Also the 1977 trans am 6.6 had a rating of the best trans am ever produced with over 400 hp. The 1977 trans am produced only 180 hp. The best trans am was the 1973 super duty 455 7.2. Pontiac shirked some ...
The head used during this time was the so-called "rectangle port", named after its exhaust port shape. The 290 heads use smaller valves, 1.787 in (45.4 mm) intake and 1.406 in (35.7 mm) exhaust, corresponding with its small bore. The 343 and the AMX 390 use the same larger valve heads, 2.025 in (51.4 mm) intake and 1.625 in (41.3 mm) exhaust.
Replacing the Pontiac-built OHC six-cylinder as the base engine for Tempest, LeMans, and LeMans Sport was Chevrolet's 250 cubic-inch straight-six engine. V8 offerings included 350 and 400-cid options with 2-barrel carburation and a 330 hp (246 kW) 400-cid 4-barrel carbureted engine with dual exhausts. The four-barrel 350 HO was discontinued.
9. 1970 Pontiac GTO Judge Convertible. Auction Price: $1.1 million. Only 168 GTO Judge Convertibles were produced in 1970, and of those, just seven were made with a three-speed automatic transmission.
The GMC straight-6 engine was a series of gasoline-powered straight-six engines introduced in the 1939 model year by the GMC Trucks division of General Motors.Prior to the introduction of this new engine design GMC trucks had been powered by straight-six engines designed by the Buick, Pontiac and Oldsmobile divisions of GM.
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related to: best heads for pontiac 400 engine specs hp