Gavin, I don't you mentioned who did the vacuum heat treating, you personally or did you send it to a company?
Which company?
If you sent out, what do they charge per rod?
Heat treatment to remove some austenite, then cryo to strengthen even further might be the best solution if you wanna run the older rods.
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69 GTO Convertible, 4000lbs
462ci, 606tq/569hp - 93 oct @ 34 deg (207psi)
11.7:1, KRE H Ports, Lunati HR 282/290 w Johnson Lifters & 1.65 Scorp, E30, EFI, Holley HP + Dual Sync, 12-1 Crank Trig, 120lb Inj & 1000cfm TB, Torker II EFI Int & Rails, PTC 10", Rock Valley SS Tank, Dual 450s, Aerom EFI Reg, Aero Front & Wilwood Rear Disc Brakes, Dougs 1 7/8" & Borla Pro XS 3", Alum Rad & Dual Fans, 12:1 Box, UMI Arms & Viking Berz Fr + Rear CO Shocks, Hella UP5.0 Vac Pump, 12 Bolt, 3.73, 33 Spline
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