New Crow Cams GM 6 and V8 Conical valve spring packages
One of the common dilemmas for builders of performance street Holdens and Chev Small blocks is the desire to run camshafts with high lift being restricted by the need to run double valve springs and the associated expense, time and hassles involved in machining cylinder heads to suit the bigger valve springs.
Now Crow Cams have a solution utilizing their range of high performance conical ovate wire valve springs and specially designed super-light chrome moly retainers to suit .343” valve stems and 7 degree valve locks.
The conical spring design is well proven in many late model engines most notably the GM LS1 where conical springs are regularly used on cams between .550” and .600” lift at relatively high RPMs with outstanding reliability and resistance to pressure loss.
The “beehive” spring design combined with the small lightweight retainer resists valve float better than traditional straight spring/retainer combinations giving greater RPM potential. The standard O ring seal will not fit with this combination. You can choose positive guide fit stem seals or a Falcon umbrella seal is also satisfactory.
The valve train weight saving in the retainer alone is significant with the new Crow conical chrome moly retainer weighing a mere 11 grams compared to a double spring chrome moly equivalent at 27 grams. Even Titanium double spring retainers are substantially heavier at 17 to 19 grams.
Two conical spring and retainer packages to suit Holden and Chev V8 and one for the Holden straight 6 are available ex stock with the following specifications
Part No Installed Max Valve Seat Spring Pressure Price
Height Lift Pressure at Max lift
Holden Chev V8
VTKCS81 1.785” .550” 110 lbs 270 lbs $317.00
VTKCS83 1.785” .585” 135 lbs 310 lbs $410.00
Holden 6 cyl red
VTKCS61 1.725” .550” 125 lbs 285 lbs $238.00