Stage 8 Locking Header Bolts 4.6/5.4L from LFP are designed to be 100% reliable.These Stage 8 locking header bolts from LFP are designed to be 100 percent reliable. According to Ford, there have been zero failures in more than 6,000,000 applications! They absolutely, positively will not back out. These bolts eliminate the need to monitor and tighten bolts regularly. This system utilizes an active mechanical locking devise that positively prevents the fastener from rotating. This eliminates the “Tighter Is Better” method.
Part #: 8906