Tial BV50 & Q/QR BOV Springs

Genuine Tial blowoff valve springs.

Select spring pressure based on engine vacuum reading.

"Version 1" Tial 50mm BOV:
-24 to -26 in/Hg use brown spring (13 psi)
-22 to -23 in/Hg use yellow spring (12 psi)
-18 to -21 in/Hg use unpainted spring (11 psi)
-14 to -17 in/Hg use white spring (9 psi)
-10 to -13 in/Hg use black spring (7 psi)
0 to -7 in/HG (or supercharger) use green spring (3 psi)

"Version 2" Tial Q/QR BOV:
-22 to -24 in/Hg use brown spring (12 psi)
-20 to -21 in/Hg use yellow spring (11 psi)
-16 to -19 in/Hg use unpainted spring (10 psi)
-12 to -15 in/Hg use white spring (8 psi)
-8 to -11 in/Hg use black spring (6 psi)
0 to -7 in/HG (or supercharger) use green spring (2 psi)

Sold individually.

Choose spring from drop-down below: