389 MONOBLOC VELOCITY STACK

BILLET 1 PIECE 389 MONOBLOC VELOCITY STACK WITH STAINLESS STEEL GRUB SCREWS.

USE ON: ALL 389 MONOBLOCS
OVERALL LENGTH: 3" (76MM)
WEIGHT: 100G
DIAMETER: 2 1/4" (57MM)
BOSS OUTSIDE DIAMETER: 2.05" (52MM)
BOSS INSIDE DIAMETER: 1.744" (44.3MM)
BOSS LENGTH: 5/8" (15.5MM)
FINISH: POLISHED
MATERIAL: ALUMINIUM ALLOY
BORE: 1 3/16" (30MM)


ONE OF A RANGE OF UK MADE, TURNED FROM SOLID ALUMINIUM BAR, AIR INTAKES (VELOCITY STACKS) TO SUIT AMAL (AND PERHAPS OTHER) CARBURETTORS.  TYPICALLY SEEN ON RACING AND CAFE STYLE BIKES FROM THE SIXTIES AND SEVENTIES.

THE RANGE COVERS MOST AMALS, THE BORE IS THE MINIMUM BORE OF THE TAPERED AIR TRUMPET, THEY ARE NOT BORED TO EXACTLY SUIT EVERY SIZE OF CARB IN A PARTICULAR SERIES ie A 928/076 VELOCITY STACK WHICH FITS THE 900 SERIES MK1 CONCENTRIC AMAL WOULD BE BORED TO 32MM EVEN THOUGH THE 900 SERIES CARB COULD BE 28, 30 OR 32MM BORE.  THE GAP OR STEP ON THE INSIDE WHERE THE CARB MEETS THE STACK WOULD TYPICALLY BE EITHER LEFT AS IS (ON CAFE RACERS) OR FOR FULL COMPETITION USE PERHAPS BLENDED AWAY USING PERHAPS ARALDITE (A TWO PACK EPOXY TYPE GLUE).

LENGTH STATED IS OVERALL LENGTH.

YOU CAN USE THE BOSS DIMENSIONS QUOTED TO DETERMINE SUITABILITY SHOULD YOU BE TRYING TO FIND SOMETHING FOR A NON STANDARD APPLICATION.

THE FULL RANGE OF VELOCITY STACKS WE HAVE IS:
376/076 - 376 MONOBLOC BILLET
389/076 - 389 MONOBLOC BILLET
050084 - CONCENTRIC BILLET TO SUIT AMAL GP
626/076 - MK1 CONCENTRIC BILLET 600 SERIES (22-27MM)
928/076 - MK1 CONCENTRIC BILLET 900 SERIES (28-32MM)
1034/076 - MK1 CONCENTRIC BILLET 1000 SERIES (34-38MM)
050082 - MK2 CONCENTRIC BILLET 2900 SERIES (28-34MM)
050083 - MK2 CONCENTRIC BILLET 2000 SERIES (36-40MM)