SB Pistons

Special Piston Services
Did you try these guys in Melb? or is that where you got the initial $3000 quote from?
Haven't heard of them gave them a call about 6 weeks to make $2500 Aud so about $1900 USD
Last set I had made by Diamond they made for 4.125 SB LA we told them Victor heads so they made the pistons SB but with big block victor head valve pockets in the piston which we had to recut through the Ceramic coating