Here is what is required to get some decent springs on your iron heads if youre looking to take advantage of some aggressive cam profiles. These modifications will allow the use of some very aggressive lobes that traditionally werent used or possibly they were mis-used on our engines because the spring pressures were inadequate. Some figured this out years ago and the performance of their cars reflects their knowledge. First inner spring location is achieved, then guides cut for .500" metal clad seals for inner spring clearance, then assembly with titanium retainers and machined steel locks to leave the most possible room for installed height. We are at the mercy of coil bind and the extra lift is a product of the aggressive ramps. These modifications will set one engine well ahead of another if the turbo and cam profile/timing are in check. Were not talking a few hp either. Increased average cylinder pressure across a broader range without adding in extra overlap down low, more cylinder pressure at low rpm from reduced overlap so spooling is better, and of course huge increases in duration from .200" up which will raise the usable power band. This is what fills the cylinder and makes power. I can provide this service as well as spec cams/springs that will work ideally with these modifications and support the rest of the combo. I can alter aluminum heads for these types of springs also. In some instances for really crazy builds the valves need to be replaced for taller ones to be able to run larger spring packages and avoid coil bind. Pushrods may need to be upgraded and pushrod to head clearance verified. You find out the cam specs after i send you the cam which comes with complete analysis and installing recommendations. So please do not ask for cam specs here.
