John, don't have any experience/knowledge with those heads specifically but want to share the following. I see the ad says bare heads which means no valves, springs, retainers, etc.
A few weeks ago, I bought Summit brand heads (SUM-162109) for my daily driver/semi-modified 350. I did a lot of online research/comparisons/reading. I was looking for aluminum that weren't outlandishly performance but would give me more oomph yet would not break the bank. I had read on a site that Summit's heads were made by Trick Flow. On the Summit site, I compared the ones I eventually bought with Trick Flow's TFS-30410002. With the exception of a few features (combustion chamber style, intake/exhaust runner volume, max valve lift, and valve guide/seat material), they appeared identical. But for me, the major difference was price: Summit brand $1099/pair vs TFS $635 each.
I haven't installed the heads yet...still building the motor but wanted to share some information with others who are updating/upgrading their rides.
Good luck!
A few weeks ago, I bought Summit brand heads (SUM-162109) for my daily driver/semi-modified 350. I did a lot of online research/comparisons/reading. I was looking for aluminum that weren't outlandishly performance but would give me more oomph yet would not break the bank. I had read on a site that Summit's heads were made by Trick Flow. On the Summit site, I compared the ones I eventually bought with Trick Flow's TFS-30410002. With the exception of a few features (combustion chamber style, intake/exhaust runner volume, max valve lift, and valve guide/seat material), they appeared identical. But for me, the major difference was price: Summit brand $1099/pair vs TFS $635 each.
I haven't installed the heads yet...still building the motor but wanted to share some information with others who are updating/upgrading their rides.
Good luck!
