Need new Head bolts

^^^got the rest of the document for head install??? also how would you know if you have a high altitude head??? part number??? I had pinging under load and head has been off before and I don't know history.

High altitude head: 351 779 R1 Highly unlikely on a numbered LoBoy You should have a 355 691 R2

^^yup, thanks, Mine has the r2 head