Stock exhaust manifolds vs headers

tandart66 said
What would I have to do to reach 9:1/9.5:1 CR? Only thing ive told the machine shop to do thus far is to overbore it to get all the damage cleaned up (probably 0.030).

I believe RRR & Volaredon had their cylinder heads cut 0.100 to raise the comp ratio. RRR said his comp ratio is now over 10:1.