I’d give that combo (130 seat/400 open, 1.7 RR) about a 2% chance of surviving break in these days.

In other words……no surprise it didn’t live.

At least the mystery has been solved.

On the plus side….sounds like the current springs would possibly work with a HR cam.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads