Hey guys. In my iron head 3.4 I want to put a big Crower cam in it. Right now I am running a Crower 03043 cam with:

212*/218* at .050"
.464"/.479" lift with 1.6:1 rockers
112 lsa
108 icl

Valve train is comp 981 springs with matching retainers set at 1.7"seat height, with a coil bind at 1.150", meaning its safe max is .490" lift, and coil bind is at .550" lift.



The cam I am looking at is a Crower 03050 cam with:

226*/234* at .050"
.501"/.524" lift with 1.6:1 rockers
108 lsa
104 icl
(and advance the cam another 4* from the sproket)

Can I use my 981 valve springs, with Manley 23652 (+0.050" offset retainers) on all the valves, and put a 0.03" shim on the intake valves, for a 1.72" installed height, for a safe .510" lift, coil bind at .570"..... and a 0.015" shim on the exhaust valves, for a 1.735" installed height, for a safe .525" lift, coil bind at 0.585" lift.

What do you guys think?? No reason this shouldn't work right?? I only spin this little motor to 5500 rpm on occasion. The cam manufacturer calls for 90-100 lbs on the seat. In this case my intake valves would sit at 97 lbs and the exhaust valves would sit at 93 lbs.