Have been running an out of the box set of 440-1 heads on a 13 to 1 compression 440 for the last 4 years and the combination is maxed out. Was thinking about sending them back to INDY for their 325-CNC porting and a good valve job.Is that a good plan or should I look at other options?
Talk it over with Dwayne at Porter Racing Heads. I'm not so sure that you can send them to Indy for the CNC porting since the castings might have changed over time. Dwayne would know the scoop on that. Dwayne can port them for you and/or provide you with some options.
