ok fellas i got a few more questions and would love some feedback and opioins on what u guys think..... start with i live and ride in west Virgina on the hatfeild trails and the outlaw trails , well im eventually looking into building serval 4 mill 396 shee, as of now i have a vitos hemi coolhead with 21cc domes, i have plus4 timing , toomey t4s, k&n filter with airbox and airbox lid, plus 2 aarms and plus 4 axle, i started to have it the cylinders ported but i know that by next year i have intentions of haveing a 4mil, and the 396 bbk, i started to go with the athena 392 but from what i have read the serval is the way to go ecspecially with my type of riding there is water trails some are tight and alot of coal slate dump climbs..... well what i am basically asking is where do i find the top end only for now and is it possiable to buy the cylinders already ported ..... Thanks guys