Originally Posted by blakethechop
hi i have a pontiac firebird 455 with 4x heads 113cfm i want to port heads and have read jim hands book has any body ported 4x heads and would you do chamber as in jims book or would this lower cr i want to keep heads and would appreciate info should i use higher cr pistons smaller head gasket mill heads ?any help would be great. i live in australia so locating different heads is a impossibillity and dont want to spend 3 grand on new heads shipped from usa
Yes you can use a thinner head gasket to make up for a little less compression. But when you cut the chamber only do what is needed to allow for flow around the valves. You will loose very little compression just by tpuching up the chambers.
Do your self a favor and get a set of edelbrock heads before you put more money into the heads you have. Most of the after market heads will out flow ported heads stock heads.