308 or RHS on a 408

308s are prone to cracking? Hmmm, never heard that before. Anyway, I have a set of ported 308s on my 408, but I already owned them and the RHS heads were not available at the time. I have total of about $800 in my heads. If I were to build another 408 or 416 then I would seriously consider the LA-X RHS heads prepped by Brian and IMM (member ID OU812).