confused about ls6 springs on 3500heads

[hookdonspeed]

ive just read about 10 diffrent threads on the valvespring swap on 3500heads, some people are saying they just "fit" others are saying to cut the 3500 seats, and some are saying they need the ls1 shims that are widened with 2.2l seals...

has anyone figured out whats actually needed to be done on the 3500?

[Superdave]

LS1 shims widened by a few mm, 1991 2.2L Cavalier exhaust seals (12) and stock retainer and locks.

I've installed several sets and even had a how-to video but it looks like Putfile.com shut down so it's gone.

do not run them over .500 lift.