i have 081 heads im porting and putting all new stuff on it seeing im upgrading to the lt1 cam would this springs work

http://www.ebay.com/itm/Stock-1-84-1-5-Valve-Z28-Spring-Retainer-Kit-sb-Chevy-283-305-327-350-400-sbc-/171363629381?pt=Motors_Car_Truck_Parts_Accessories&hash=item27e6117945&vxp=mtr

 

They'll probably work just fine. I've used very similar Comp 981 springs quite a few times on mild factory hydro-roller cams.

Remember you're going to need about a 1/16" shim in the exhaust spring pocket to get the installed height back to spec if you are ditching the big, fat factory rotator/retainers on those valves. I only mention it since many people installed "standard" retainers on both intake and exhaust when doing such an upgrade. The factory sinks the exhaust spring pocket about 1/16" deeper than the intake side to make up for the added thickness of the rotator/retainers.

Shoot for 1.70" installed height, not the taller 1.75" spec. You'll want the extra pressure with a hydro-roller.