[Paul Ceasrine]

The 1962 Pontiac SD-421 (Early-version, up to March 1962)
Engine; 421/405 Horsepower
Transmission; Borg-Warner T-10 4-Speed
Cost; $5000

Prouction Numbers;
* Catalina Hardtops,,,,,,,,,,,,,,,139
* Catalina Sedans,,,,,,,,,,,,,,,,,,,,24
* Grand Prix Sport Coupes,,,,,16
* Total Built,,,,,,,,,,,,,,,,,,,,,,,,,,,,,179

Purpose built from air-cleaner to oil-pan as a 'Certified Super Stocker'.

*The 421 Super-Duty featured a beefy 4-bolt main block, with a
forged steel crankshaft.
* 11.0 - 1 compression Mickey Thompson forged aluminum pistons.
* Special Heavy-duty connecting rods
* 8-quart wide-sump oil pan
* Agressive McKellar #10 camshaft (.465" Intake lift / .465" Exhaust lift , Duration 308* Intake / *320 Exhaust)
* Solid lifters
* 1.65 Ratio Rocker-arms
* Big-port cylinder heads (Casting #540306) (w/66.8 CC Chambers)
* Activated big-valves (1.92" Intake / 1.76" Exhaust)
* Twin Carter AFB Carburetors (500 CFM)
* Aluminum dual-plane intake manifold
* Cast-iron long branch exhaust manifolds

Additional track-ready Super-Duty fare included various optional lightweight body parts.

* Aluminum hood
* Aluminum front fenders
* Aluminum front bumper
* Aluminum inner fenders
* Aluminum radiator brackers
* Aluminum exhaust manifolds

Available in 1962, was a 'special frame' that featured perimeter rails
cut out to transform rectangular tubes into channel rails.