'Match Race 1969' 440 'Cuda vs 440 'Six-Barrel' Road Runner

Eddie,

Engine Components

The 440 'Six-Barrel' Engine did come though with .0005 under-sized Hydraulic-Lifters,
which eliminated friction, and were also ground flat-faced for improved rotation
when riding on the low-taper design Camshaft {#4529770}.

The 'Push-Rods' for both the 440/390 HP and 440/375 HP Engines were
5/16" Diameter Tubular-Steel {with .060" steel} {#2899595}.

The Camshaft Sprocket Gear {#3512903} for the 440/390 HP timing chain was a 3-Bolt Design,
as opposed to the Single-Bolt Sprocket Gear for the 440/375 HP.

Both engines used a 'Windage-Tray', but the 440 'Six-Barrel' was fitted with a
426 Street Hemi 'High-Volume' Oil Pump which increased oil-flow 25% over the
stock 440/375 HP oil-pump.

Both the '1969' 440/390 HP and 440/375 HP utilized the same Vibration Damper
{#2658457} which was a 'thin-style' forged-steel unit used for 'internally balanced'
440 Engine components.
-----------------------------------------------------------------------------------------------

Cylinder Heads

Both the 440/390 HP and 440/375 HP Engines were fitted with the same Cylinder Heads
{#2843906} - but the Valves for the 440 'Six-Barrel' were 'special' thinner .3725" Diameter,
and 'Chrome-Stemmed' for hardness. They were also designed for a 'Single-Grooved' Valve Keeper.

The Valve-Springs for the 440 'Six-Barrel' had a higher Load-Rate as well.

440/390 HP {#3418491} = #131 lbs. {Valve Closed} and #279 lbs. {Valve Open}
440/375 HP {#2658471} = #133 lbs. {Valve Closed} and #256 lbs. {Valve Open}

Rocker Arms

The 440 'Six-Barrel' came though with 'heavier' stamped-steel Rocker-Arms, which
helped limit 'Valve-Train' deflection at higher RPM's.