I have AFR 195 LT4 heads and they say that .550" max lift is just that max lift . I'd like to go with a bigger cam with my LT1 396ci .
Question :
What needs to get done to install a biger cam (overall max lift to .650" )
1) bigger springs
2) retainers
3) ???
and do you need to check for valve to piston clearance ?

 

Yes, if you dont check clearance you may punch a hole in the piston. Duration will play a big role in wether or not you hit.

When you find a spring, it will list companion parts, installed spring height etc

 

Don't understand the desire to run .650 lift on a head that is pretty much down and out by .6???
AFR offers a spring upgrade for mech rollers. Personally, I'd run a solid, keep the lift under .6 and run a spring with 160 lbs at the seat and 400 lbs over the nose. Probably something around 245/250 .580/.580.
Always check valve to piston clearance. Better safe than sorry.
JMO.

-Mindgame

 

Don't forget if your going to be running high spring weights. you have to get lifters that can handle it. stock type LT1 lifters will only handle 350-360# at max lift and not much over 125-130#'s when closed.

 

Thanks that the usefull info I was looking for .