J&M Machine is a lot closer to finishing the heads on my Chevelle. After the last machinist unfortunate work (being very nice) my new guys started from the ground up removing all the guides new and old along with all the substandard parts used previously including the spring that were causing coil bind with my current cam, cheap umbrella seals with crap valves and their hardware. The new swirl polished SS with undercut stems along with all new intake and exhaust hardened seats to allow for all specs to be brought back to new. Their work is impeccable right down to the 5 angle valve job. Still need to unshroud one head and start installing all quality new parts. Oh the new guides are machined for positive seals. The machinist expects I will see over 50hp because how poorly these heads were done initially.