1968 '340' Barracuda vs 1968 '383' Road Runner

Cudavert,

Correct.

Some Facts.

A) The 1968 383 had a slightly different rotating assembly than the 1967 383, as the
1968 Piston was now {+.021} Above the Block Deck, instead of {-.014} Below the Deck

B) The 1968 Intake Manifold was 'taller' than the 1967 Intake Manifold, as well as
having 10% Greater Branch Length, and 50% Greater Runner Size.

C) The 1968 Intake Manifold had a 1 11/16" Primary x 1 11/16" Secondary 'Square Bore' for Improved Flow.

D) The 1968 Carter AVS Carburetor 625 CFM (1 7/16" Primary x 1 11/16" Secondary)
was closer to 637 CFM.

E) The 1968 {#2843906} Cylinder Heads were 79.5 CC Open Chamber, which
had better Combustion Flow

F) The Intake Ports on the 1968 Cylinder Heads were 10% Larger, and the Intake Ports had a
radius-type design with less restricive bends in the port.

G) The Exhaust Valves (1.74" 1968 Cylinder Heads) versus (1.60" 1967 Cylinder Heads) were larger,
and the Exhaust Ports had an 18% improved flow.

H) Camshaft Specifications (see above)

I) Valve Spring Load-Rate (see above)

J) The 1968 383 Engine was equipped with an 'Oil Pan Windage-Tray'

K) The 1968 383 Engine came through with an 18" 7-Blade Fan, and Viscous Drive
Fan Clutch, while the 1967 383 had a 17" 4-Blade Fan with a Direct Fan Mount.

L) The Exhaust Manifolds for the 1968 383 had less restricive bends, and with the new Wind-Swept Design
with extended Header-passages, had a 40% Greater Flow than the 1967 Short-Header Exhaust Manifolds.

M) The Secondary Exhaust Piping (after the Muffler) for the 1968 383 was 2.25"
in Diameter, compared to 1.88" for the 1967 383.