Quote:

Make the motor either a 512 C.I., 4.250 stroke with a 4.375 bore, or a 518 C.I. 4.300 stroke same bore size as the 512. Shoot for 10.5 to 10.8 to 1 compression ratio for 91 octane pump swill and work on the rear suspension to make it hook anywhere and go have fun. My 612 HP 512 C.I. pump gas motor in my 3450 lb street Duster ran [Email]10.69@124.+[/Email] MPH through the muffs first timeout That was with ported 906 iron heads, I swapped the heads to a set of CNC ported Eddy RPM and the car ran 10.49 at 127.+ MPH. That was on a set of 30.5x13x15 M/T ET Street bias plys tires The last time I raced it it had a set of Indy SR M.W. heads and intake and ran 9.993 at 134.+ MPH through the muffs on straight Oregon 91 octane non ethanol pump swill You can get the same results also


Good info Cab, thanks, gives me alot to think about.
Got a buddy with a ford who is really tweaking me to turbo it and he's willing to help with the fab so I'm mulling that over...the GTX restoration is moving along so while it's in the paint shop I'll have some time to start on the Duster.

1968 Plymouth GTX
1974 Dodge P/U Long Bed Stepside 318
2019 Ram 2500 6.4, auto, 4WD