@Moriaty, (Really sorry I missed your July PM last year, was really busy with our vintage race meet) we had the same thing happen last year, to a members Superformance (Roush 402? 408? SBF) He had driven his 300-400 since buying it, after it being in long term storage. After his valve spring failure, his mech. here in Silverdale Wa., said it was from just sitting, he replaced all the valve spring's and checked heads & piston's gave it a clean bill of health, no harm & foul. If you need his # (Mech) over here, or we have a "new" Shelby mech. here in Gig Harbor, but you have to get in line behind Brent's car, and mine
Rob's (GH Mech.) GT-500 will be touring with us PNW members this year. Your more then welcome to join us, Cheers Tom. 360 801 4510.