[mgarblik]

Originally Posted by spawn_x

What is the issue with fastner holes?? I cant say Ive heard this mentioned. Not a small project.

Thanks for the lwad on the 6x heads

There is not a direct issue with any of the fastener holes. However, if running spring pressures over 150 lbs. on the seat and 300 Lbs open, pulling aluminum stud threads out is pretty common. When using stainless steel fasteners such as ARP, the bolts will often gall and pull out of the intake/exhaust/accessory bolt holes. Using a liberal coating of anti-sieze will help some. When fitting headers, it is common to have a little trouble starting some of the bolts. Aluminum threads are much easier to cross thread or strip than a heli-coil. Accessory bolt holes tend to pull out over time with all the load on the brackets going into aluminum threads and heads. When spending over $2000.00 for a set of heads, it would be a nice touch to have fastener holes that can hold up to several installations/removals without everything being stripped out. It's just part of making a quality product IMO. I like the KRE heads, but feel this wasn't the best place to cut corners. Even the cheapest of the cheap Speedmaster heads have some heli-coils factory installed. (rocker stud and exhaust holes).