1968 383 - +20 HP

[darth_linux]

Hi! The promo video for 1968 Chrysler models mentions that the horsepower on the '68 383 went from 270 to 290. Does anyone know what changed for the '68 model year to give this increase?

thanks!
Dave

 

[413]

270 and 290 is a 2bbl engine

Cylinder heads, they were closed chamber now open chamber
pistons need to go with the heads

 

[CBODY67]

The 256/260 4bbl cam replaced the prior 252/252 .390 lift cam. Larger 1.74" exh valves too.