ADDITIONAL PARTS WHICH MAY BE REQUIRED WOULD BE:

DOUBLE MANIFOLD TO HEAD GASKET 000581

CARB TO MANIFOLD HEAT INSULATING WASHER 063458

MANIFOLD STUD NUTS 140302S

THE HEAD SIDE PORTS ON THIS MANIFOLD CAN ONLY BE DESCRIBED AS POOR.  CORES ARE WORN AND NOT VERY ACCURATE WITH NO MATERIAL TO MACHINE.  PATTERNS ARE JUST GETTING OLD. PORT IS OUT OF ROUND.
ORIGINALLY A STEWART ENGINEERING PRODUCT WE INHERITED THE PATTERNS AND TOOLS IN ABOUT 1990 WHEN STEWART'S CLOSED. STEWART'S STARTED PRODUCING THESE MANIFOLDS IN THE EARLY 70'S, SO ITS OVER 40 YEARS OLD AND THE PATTERNS AND TOOLING ARE ALL WELL WORN NOW, THEY FIT FINE BUT WILL NOT WIN A BEAUTY COMPETITION OR FOR THAT MATTER LINE UP WITH THE HEAD PORTS PARTICULARLY WELL BUT WILL WORK FINE AS LONG AS MAXIMUM PERFORMANCE IS AN IRRELEVANCE. SUPPLIED WITH TUNING NOTES AND STUDS. 

BORE ON CARB SIDE: 31.9MM (MACHINED)

BORE ON HEAD SIDE: 33MM (AS CAST)