L48 & L82 Engine Comparison

Engine 1973 L48 1973 L82
HorsePower (Net Ratings) 190@4400 250@5200
Torque (Net Ratings) 270@2800 285@4000
Block Casting # 3970010 3970010
Block Type 2-Bolt Mains 4-Bolt Mains
Rods Drop forged steel Drop forged steel
Crankshaft Nodular iron Forged steel
Pistons Cast aluminum alloy Alum. impact extruded
Compression 8.5:1 9.0:1
Heads Casting # 3998993 330545
Heads (Materal) High chrome cast alloy iron High chrome cast alloy iron
Valve Lifters Hydraulic Hydraulic
Camshaft .390/.410 lifts

195/210 duration

116 lsa

 .450/.460 lifts

222/222 duration

114 lsa
Intake Valves 1.94 2.02
Exhaust Valves 1.50 1.60
Exhaust System 2.0″ 2.5″
Intake Manifold Cast alloy iron Cast alloy iron
Exhaust Manifold Cast alloy iron Cast alloy iron
The exhaust manifolds and the intake manifold were the same on the L48 and the L82. The L82 exhaust pipes jumped to 2 1/2 just after the manifolds. The L82 used the same mufflers and tail pipes as the LS-4 big block.
Balancer 6.75″ 8.00″
Distributor 1112098 1112130
Carburetor Q-jet Q-jet
Tach Redline 5300 5600 w/AC

6000 no AC