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

Rico,

Here is what I found.

Colony Chrysler-Plymouth
Plymouth, Michigan

1968 Plymouth 383 Road Runner Test

November 1967

A 1968 Plymouth Road Runner 'Pillared Coupe' 383 4-Speed was tested at
Motor City Dragway @ New Baltimore, Michigan in November 1967.

According to the Dealer Report, the Road Runner came from the Factory with a 3.23 Gears w/Sure-Grip.
Which the Colony Plymouth Dealership replaced with a 3.91 Sure-Grip Gear set-up.

The Distributor received a 'Performance Curve' and the Carter AVS was 'tweaked' for optimal performance.

The 383 Road Runner ran a best of 14.44 @ 98.46 MPH, on stock F70 X 14" Tires.

According to the Dealer Test, the F70 X 14" Tires were replaced with a set of 'M & H' 8.50 x 14" Cheater Slicks.

The Road Runner was re-tested, and ran a best of 14.04 @ 100.26 MPH

* Shift Points were at 5200 RPM's
* Valve Float @ 5400 RPM's