Re: piston opinions wanted
Same company. Race tec is race oriented and uses 2618 aluminum alloy. Auto tec is more street performance oriented and uses 4032 High Silicone Aluminum Alloy.
Originally Posted by cobravii
Those two materials expand at different rates when heated, among other differences.
In general, the 'street' piston will need more clearance when exposed to higher loads/higher heat..... towing, supercharging, nitrous, etc. You can run it tighter for normal use.
The 'race' piston will expand eve more and need more clearance than the street piston.
(1)'66 GS Astro Blue, 13.41 et (2)'66 GS Saddle Mist, L76 Q-jet option, 1 of 132 (3)'66 GS Flame Red, Calif car (4)'66 GS Silver Mist, 4 speed (5)'66 Special, Flame Red, 300 (6)'79 Turbo Regal, 14.1 et (7)'65 GS 4 speed 'vert