DO NOT BUY ASSEMBLED PRO COMP HEADS, lots of issues with the quality of parts, quality control sucks for the valve seat grind etc. like there jig ground and not true to the guide causing valve and seat and guide issues.
now the castings themselves bare can be okay and when the seats are ground correctly squared to the guides and assembled by someone that knows there shi* and double checks all the machining and then uses quality parts i.e valves, springs, retainer, locks, seals ect they can be made into a decent head. I only say decent because if you ever laid your eyes on a set of there 210cc intake runners from the valve side with no valves in them you will see how square and under cutting the valveseat they are I.e. poor port and casting design. without a complete message of the intake port and seat in as received form the 210's with a 2.05 valve will barely flow a true 255cfm at .600 lift.
a local guy here has custom built and remachined many many sets of these in bare form and with his quality parts has had great luck with zero issues so far after 5 years of sales he estimates around 60 sets so far.hell
even some of his being used in a solid roller circle track motor for 3 years now that screams along lap after lap from 6-8k now on the other side he just got done repairing a set off a customers motor that was brought to him (heads acquired elsewhere and assembled by pro comp with pro comp parts) with only 500 miles on them and the guides were the worst he had ever seen with wear in the .053 range after only 500 miles , so extreme the brass coming off the guides were actually coloring the back of the valves bronze!! to make matters worse when he measured the guide bores they were .503 3 thousands over. he had to custom order a set of 9/16th guides and remachine the guide bores and then regrind all the seats 90* square to the guides, new valves, springs etc.
for a set of his complete done right sbf pro comp heads he starts at 800.00 a set and up from there depending on application.
