pocket depth

[ultrafast30]

56 inch omc. 1986 block. looking for 150 + or - psi compression. What do I need to cut the pocket depth on the head to??

[ultrafast30]

New toy. Allison 13R .56 in motor on 15" mid with nitro case and lwp.

[Powerabout]

the std sst60 will get you close
spec is on the apba site
Exhaust relief holes will lower that if not plugged

[ultrafast30]

Thank you!!