TFS head part #'s

[Mac-man]

ok i was earching through summit cuz i have been reading up on picking some of these up and i saw this part number TFS-51400002
link:

Trick Flow Specialties TFS-51400002 - Trick Flow® Twisted Wedge® Street Cylinder Heads for Small Block Ford - summitracing.com

and then this part number TFS-51400004
link:

Trick Flow Specialties TFS-51400004 - Trick Flow® Twisted Wedge® Street Cylinder Heads for Small Block Ford - summitracing.com

one says hydraulic roller and one doesnt, so i was wandering what the difference is in these two sets of heads, as i have never heard of heads being designated to work with a specific cam type ??

 

[strtrcr50]

The valve springs are different. One allows cams up to .600 lift, one allows cams up to .540 lift. Cam type should be immaterial. Remember, you WILL need different length pushrods.

 

[faststang90]

most of the mustangs came

most of the mustang came with a roller cam from like 85 and that is what u want to go back with