[danielf]

Does anyone know how heavy the old orginal cast iorn ac system is? Also does anyone know how heavy the rear fold down rear seat in teh fastbacks weigh? Im curious to know if shaving those parts and swapping the stock hood and bumpers for a fiberglass hood and fiberglass front apron would increase the acceloration at all. Would all that weight be removed would really make a noticable differance. Does anyone know or have a bal park figure? Mayeb a total of 100lbs?

[motorscurity]

I think you need a pump; cast iron is not affected by the heat and cool (the clanging) cycle associated with gravity heat, but the new one might be, especially if it is copper tubing. Didn't they quit making those furnaces like decades ago?