That relates to a '63/401 cubic inch engine with the 4 bbl. carb. Rated at 325 HP @ 4400 rpm's & 445 t. lbs. of torque @2800RPM's. Advertised compression ratio is 10.25-1. In reality closer to 9.75-1 or slightly less.
Tom T.
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
Day Phone 203-324-6045 ET
NailHead Mini-Starters '53-'66
Adjustable Roller Tip Rocker Arms - All NailHeads
Custom forged pistons
Front & rear neoprene seals
Many other "Nail" parts
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