worked really well for me also...the tight RA, ARP's, and HKS gasket.

 

what exactly does RA refer to Tony?

only thing here i didn't quite grasp.

 

roughness average...it's a machinist's thing. you want the surface as close to mirror polish as possible. supposedly copper helps to seal minor imprefections and doesn't require a tight RA like stainless steel, but i'm not so sure i wouldn't use a tight RA regardless due to the idea that any metallic headgasket needs a good set of mating surfaces to seal well. though, one doesn't shave one's block, one gets one's block decked.

 

thanks for the clarification...

 

stuff one needs to know before suggestion to others...LOL