Why you should upgrade your rocker trunions.

 

On the left is a fully caged trunion bearing and on the right is a half caged trunion bearing with a two piece bearing (taken apart). They both serve the same purpose - to allow the rocker to open the valves with the least resistance possible - but the reliability is day and night. 
When you start upgrading your camshaft, there is more stress on the rest of the valve train.  The stock half trunion, two piece bearing was not originally designed to handle the added stress of the larger camshaft. 
With more power, everything moves quicker and is under more pressure to create more power.  Multiple piece bearings, although pressed in tight, have a chance of separating from the rocker body and coming apart.  In turn, all those little pins have a chance of falling into the motor and causing a catastrophic failure.
This is an easy 2 hour job and a small upgrade that can make a drastic difference in reliability and increase your engines overall life. 
 

 

New Cylinder Heads?

 
Recently, one of my customers was baffled when I suggested a new $200 ARP High Performance Series Cylinder Head Bolt Kit to go along with his new cylinder head. "...but nothings wrong with the the old ones."  Although that could be potentially true, spending $1,200+ on a prime new quality machine finished head and having your mechanic put in 15+ hours of labor to swap these, you might as well. Here's a few things to take into consideration as to why: 1. Bolts stretch. Like a spring, if you were to pull it apart then try to squeeze it back together to its original form, its pretty much impossible. As the bolts are tightened the first time, the amount of tension these bolts have to go through to keep the gasket connected is immense, and with that being said, its normal for a bolt to stretch as it tightens. 2. You wont get the same tension with already used bolts. We can use them again its not impossible, but its already gone through some wear.  3. Don't pay for double the work. You're mechanic doesn't mind, its our job. But if this happens, I gerantee you'll buy the new bolts the second time around (because the first ones will be obliterated) ;) . Get it right the first time.  SO. If your curious and want to learn how to blow a new head gasket? Don' buy new bolts.   

Recently, one of my customers was baffled when I suggested a new $200 ARP High Performance Series Cylinder Head Bolt Kit to go along with his new cylinder head.
"...but nothings wrong with the the old ones." 
Although that could be potentially true, spending $1,200+ on a prime new quality machine finished head and having your mechanic put in 15+ hours of labor to swap these, you might as well. Here's a few things to take into consideration as to why:

1. Bolts stretch. Like a spring, if you were to pull it apart then try to squeeze it back together to its original form, its pretty much impossible. As the bolts are tightened the first time, the amount of tension these bolts have to go through to keep the gasket connected is immense, and with that being said, its normal for a bolt to stretch as it tightens.

2. You wont get the same tension with already used bolts. We can use them again its not impossible, but its already gone through some wear. 

3. Don't pay for double the work. You're mechanic doesn't mind, its our job. But if this happens, I gerantee you'll buy the new bolts the second time around (because the first ones will be obliterated) ;) .
Get it right the first time. 

SO. If your curious and want to learn how to blow a new head gasket?
Don' buy new bolts.