Imo....... and acknowledging I don’t know everything about your combo........I bet it’s a valvetrain issue...... most likely springs.

Do you know the spring part number and installed height?

Last edited by fast68plymouth; 08/16/19 01:00 PM.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads