Lunati has a set of VooDoo spings that handle .680 lift come as a kit for the LT1 heads for a little over 100 bux. http://www.summitracing.com/parts/LUN-73943K1LUN the ones i currently have installed on my heads shimmed to handle .640 lift and brining the spring pressure to 120# on seat.

hmm thanks for the info ill check those out thats a great deal to hows the quality any problems?

havnt been on for a while have a question looked everywher for the answer as there are many options to this! for my turbo setup im almost complete i need to set up pvc checkvave ect: what should i do do i come off the front intake port to checkvalve to oil vapor seperator back to side intake and run a puraltor breather on pass side valve cover to throttle body im so confused any ones 2 cents detailed plaese and thanks!