Here in the Bay Area of Calif $3500-5000 is not out of line for a full
rebuild of an Alfa four-cylinder at a respected Alfa shop. Just the machine
work for a full-on valve job, done somewhere like Norman Racing, costs in
the range of $500. I realize we have high labor rates around here.
I'm s-l-o-w-l-y rebuilding a 1750. My local good 'ol boy machinist
resurfaced the head and ground the valves and seats (3 angle) for a total
of 75.00. The head was delivered to him with the bottom exhaust studs
removed (for milling), and the valves removed, cleaned, and decarboned (and
labeled for correct placement). I will reassemble valves into head and
adjust valve lash myself.