Originally Posted by manitou
All Supertech valve train w/ dual springs. Junior had boost at 21 psi/ 93 & 26 psi/ E85.
Good to 8k?
I went with D25s for the OB response and torque vs. higher revs of the B25 heads. My heads do breath very well!
The d25 head has a faster burning chamber than the b25. So in theory it can make more power at higher rpm provided you don't go crazy with the timing.