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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 shakers had a "6.6 Litre" decal for all L78 Pontiac 400 and L80 Oldsmobile 403 engines. Only the optional W72 Pontiac 400 received the "T/A 6.6" decal. [39] As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" with the RPO W72 became available as a pay-extra upgrade to the standard ...
As Pontiac had discontinued the 455 in the previous model year, a modified 400 Pontiac V8 dubbed the "T/A 6.6" RPO W72 with a single four-barrel 800CFM Rochester Quadrajet carburettor rated at 200 bhp (203 PS; 149 kW) at 3,600 rpm and a maximum torque of 325 lb⋅ft (441 N⋅m) at 2,400 rpm, as opposed to the regular "6.6 Litre" 400 (RPO L78 ...
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.
The Catalina continued as Pontiac's entry-level full-size automobile with a Buick-built 231 cubic-inch V6 now standard in sedans and coupes (Safari wagons came standard with V8 power) and optional V8s of 301 CID, 350 CID and 400 CID displacements, each Pontiac-built engines and offered in all states except California. The Pontiac 350 was ...
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 400 cu in (6.6 L) version was the second, tall-deck "big-block" Olds. Two distinct versions of the 400 CID engine were made: 1965-1967 "Early" 400s used a slightly oversquare 4.000 in (101.60 mm) bore and 3.975 in (100.97 mm) stroke for an overall displacement of 399.6 cu in (6,549 cc). All the pre-1968 engines used a forged steel crankshaft.
Pontiac thought they were making the perfect high-performance luxury car in the 1970’s, but they were really producing the perfect base for a low-rider.