BC0300 - Toyota 2JZ/1JZ Single Spring/Titanium Retainer Kit

Designed for up to 9000 rpm and 800whp, BC valve springs by PAC Racing are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures for consistent pressures.

Type  -  BC1300 Single Free Length   -  1.690“ Seat -   1.325” @ 80 lbs Open -   0.980“ @ 158 lbs Coil Bind  -  0.810” Retainer -   BC2300-24 Spring Seat  -  OEM Net Cam Lift  -  0.460“ / 11.68mm

Aftermarket cams increase the efficiency of your head by using higher lift and duration. Any time you increase the lift and duration of a cam, you are putting more stress on the valve springs and retainers. Factory valve springs were not made to handle the abuse of higher lift and duration, especially not at the rpm we take our engines to when racing, or even driving enthusiastically. If you are installing upgraded cams, do yourself a favour and install valve springs and retainers while you're in there.

Your stock valve springs can fail in 3 different ways. 

BIND -

They can “bind” and get stuck, losing their ability to open and close the valve. This is an easily diagnosable failure. Depending on how it binds, it could cause failure to other engine parts.

BREAK -

They can “break” into pieces dropping the valve into the combustion chamber and consequently ruining your bottom end.

FLOAT -

“Valve Float” is a hard to diagnose condition where the valve spring rate is not high enough to fully extend the spring and close the valve after a complete rotation of the cam before the cam comes back around again. So what ends up happening is that when the cam is spinning fast (high rpm) the valve never closes, and combustion leaks out of the engine, and the engine loses power.

Engine Code

1JZ-GTE 1JZ-GTE VVTi 2JZ-GE 2JZ-GE VVTi 2JZ-GTE 2JZ-GTE VVTi

Vehicle Groups

GS300/Aristo 91-97 S140 GS300/Aristo 98-05 S160 IS300 01-05 XE10 SC300/Soarer 92-00 Z30 Supra NT MK4 93-98 JZA80 Supra TT MK4 93-98 JZA80