kevinb

I am pieceing together a heads/cam setup for my lt1. So far i have got a Crane 222/230 camshaft with the specs bellow. I also have a set of mixed 1.5 and 1.6 ratio nonsa roller rockers. My question is what is a good spring and retainter combo that will work well with this setup and will it require machineing the head to fit (i don't want to if possible). Crane suggests the springs below but i believe they require machining. Thanks for the help!

Cam duration; 222-230 Lift: .509 I and .528 E with 1.5 rr's
Lift with 1.6rr's: .535 I .559 E approximately.
Power range: 2500rpm-6000rpm
Recommended springs: Crane p/n: 99846 (Dual springs)