They are ok, but there are better heads for the money out there like the TFS or canfield or AFR.
There is a mustang in Jacksonville fl that has the same mods but with different brands. He has the systemax package in a '95 model and I can walk him by about 3 car lengths.
We stopped and talked about what we had and we are very evenly matched as far as components.
BTW his has been tuned and mine has not so I would say they are good heads but there are better heads for the money.
I have the canfields and I love them.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
Best 1/8 time on motor 7.686 @90.20mph