Need OD measurement of DG 400 header pipe (didn't have any in the shop to measure)
thanks
These are from the 70's RD400
(https://i.ibb.co/CHxwc5Y/pipe2.jpg) (https://ibb.co/wzDdkNP)
(https://i.ibb.co/MVgDZvs/pipe.jpg) (https://ibb.co/wWdNBkR)
thanks much
john