Special Machine shop detail listing  Page 3 0f 3

ZS25 OFFSET GRIND A-SERIES CRANK FOR LONGER STROKE
CAN BE EITHER 'AUSTIN AMERICA' OR 1300 MARINA INLINE CORE GROUND DOWN TO SUIT 1.625" SIZE RODS. WHENEVER POSSIBLE WE ALSO WIDEN THE ROD JOURNAL WIDTHS IF THE CRANK FORGING ALLOWS, SO AVOIDING HAVING TO NARROW THE RODS $229.00

(APT HAS DIFFERENT FULLY PREPPED CRANKS AVAILABLE FROM STOCK, THESE NORMALLY INCLUDE: 1275 MINI, 1275 MIDGET, 948, 1098 FORMULA JUNIOR, MGA 1489/1622 & MGB 1800).

Blocks & Piston work

Z023 MACHINE VALVE RELIEF IN 1 PISTON
THIS IS NORMALLY IN THE FORM OF A SLOT AND DEPTH CAN VARY WITHIN WHAT IS ALLOWED BY THE PISTON. - PER PISTON $13.50

Z024 OFFSET ANGLE DISH
(THIS SMALL DISH PUTS MORE VOLUME UNDERNEATH THE SPARK PLUG, IN EFFECT MAKING THE ENGINE 'THINK' THE PLUG IS MORE CENTRALLY LOCATED THAN IT REALLY IS). PER PISTON $14.00

ZS02 HOT TANK BLOCK OR HEAD $72.00
WE THEN PAINT WITH A CAST IRON PRIMER

ZS04 ALIGN BORE BLOCK 4 CYLINDER MAINS
(WILL VERY OFTEN REQUIRE THRUSTS FACING ALSO, SOMETIMES TO JUST BRING DIAMETER OUT ON CAP SO THE THRUST WASHERS ARE NOT CRUSHED TOGETHER. JOB #ZS15 LOOK OUT FOR THIS!!) $199.00

ZS06  DECK BLOCK - 4 CYL. $64.00

ZS15 FACE BLOCK THRUST FACES OF CENTER MAIN
(ALWAYS NEEDS TO BE DONE WITH A STEEL CENTER MAIN CAP AND VERY OFTEN EVEN WITH THE STANDARD CAP TO SWEEP OUT A RADIUS TO ACCOMMODATE THE THRUST WASHERS WITHOUT CRUSHING THEM TOGETHER $49.00

ZS20 REMOVE & REPLACE A OR B OIL GALLERY PLUGS
(THIS IS FOR THE 4 MAIN GALLERY PLUGS WHICH SHOULD ALWAYS BE REMOVED PRIOR TO HOT TANKING. DOES NOT INCLUDE NEW PLUGS. WE NORMALLY REPLACE WITH PRESS IN TYPE WHICH ARE JUST ABOUT THE BEST THING TO USE. FOR ONCE THE FACTORY GOT SOMETHING RIGHT! $30.00

ZS21 REMOVE & REPLACE A OR B CAM BEARINGS
(THESE SHOULD ALSO ALWAYS BE REMOVED PRIOR TO HOT TANKING). $39.00

ZS22  OFFSET BORE BLOCK A-SERIES FOR 73.5 OR 74mm PISTONS $222.00

ZS24 BORE+HONE 4CYL +20 INCREMENT ie. GO UP ONE SIZE $169.00

Labor Charge

Z026 LABOR 1 HOUR INCREMENT PER HOUR (OR PART THEREOF) $59.00

  

Fly_cut.jpg (26844 bytes) By using an adjustable piston vice like this very accurate and also repeatable valve relief cuts can be made on each piston.

 

L_Bore.JPG (17633 bytes) Line boring is always required if you fit a 4 bolt steel main as has been done here to this Mini block. Remember the thrust faces need to be done also, not only to the correct cap width but also diameter.

 

wpe4E.jpg (8956 bytes)

bb_1380.jpg (29096 bytes) Offset bore 1380. The first time you look at one of these blocks you might not be too sure, but after you have built and driven the first one you probably won't consider anything else!

bb_block.JPG (16787 bytes) The purpose of offset boring is to increase the amount of metal remaining between the two center bores. So in a nutshell: number 1 &2 are moved towards the water pump, number 3 is moved towards number 4, and number 4 is very often not moved as on very big bores, usually 74mm and above, its possible to break through into the rear oil galley that takes oil from the oil pump to the pressure relief valve. This does not happen very often, but when it does it is fixable by reaming out the hole and fitting a thin wall tube. The problem area is right at the very bottom of the bore, so no where near the rings.

     Back     Home