I know spence pretty well...and he certainly knows what he's doin!! He built my rst engine and ported the head (not a cossie i know), and has genuine interest in what he's doin cos it's not his everyday job so not relyin on it for his sole income. At the end of the day, there's plenty of people out there who know how to port a head, just gotta pick the person u trust is gonna do the best job!