Last M52 motor I priced from Boston AUto Japtec went for....
R32,000...
I told the dude he was off of his peanut and that you can buy a complete car with that... he was like.. go buy it then...
Whats wrong with your car bud, spares are fairly cheap....
My build turned nasty as well, we discovered that the moron that engineered the valves cut the valve seat 1.5mm to deep, therefore the valves do not close...