Hi Paul,
As I mentioned these heads are on the car. Randy Gillis had a custom set with a -17cc "dished" pistons netting a hair over 10:1 CR (compression ratio) I went with them. A flat top piston with just eye brows would have pushed the CR over 11:1 - 11.5:1 somewhere in that vicinity.
A little too much to run on today's pump gas. I'm good with the performance for what it is for the most part, but every now and then do I wish it were higher? And deal with needing a better grade of fuel? eh? Sometimes
As mentioned before, just about ANY of today's aftermarket aluminum heads will out perform these. Again, it's okay by me. (You know my car).
Cheers
~Earl J
As I mentioned these heads are on the car. Randy Gillis had a custom set with a -17cc "dished" pistons netting a hair over 10:1 CR (compression ratio) I went with them. A flat top piston with just eye brows would have pushed the CR over 11:1 - 11.5:1 somewhere in that vicinity.
A little too much to run on today's pump gas. I'm good with the performance for what it is for the most part, but every now and then do I wish it were higher? And deal with needing a better grade of fuel? eh? Sometimes
As mentioned before, just about ANY of today's aftermarket aluminum heads will out perform these. Again, it's okay by me. (You know my car).
Cheers
~Earl J