a 1-3/4 16 gage 0.065 final primary tube would call for a mock collector size of ... 1-7/8 18 gage tube just cut 2 lengths square them off and ... are being made and the primary tubes can be made longer for exact trimming ... collector can be mounted solidly to the chassis bellhousing etc for a reference point ... have built the mock-up header in the chassis you can use a cylinder head mounted on ... collector can be slipped on the primary tubes when laying out a prototype tube pack ... a vacuum cleaner hose or other similar tube in approximately the same diameter as ... for final mock-up construction and tube size ordering when designing the tube ... is a good time to talk about measuring tube length use a 1/4 wide steel tape ... plane it is also helpful to hold the tube in a vise or clamp when measuring sight ...
