Pretty confusing couple of weeks trying to find the correct valves intake and exhaust for these heads. i have been told the asembled #19419197 or lsx 454 heads

every spec imaginable the stock ls7 valve looks to be 2.205" with a length of 5.2"

looking at the lsx454 specs the valve is 2.250 with a length of 6.37" wth 5.37 would be close but 6.37" ? What kind of springs retainers and locators would we have to use?? the installed spring height would be about 2.85" valve covers ???

the seat are cut for 2.250" valves any help appreciated

please be kind first post ever
Paul