installing heads that are milled .030, stock gm mls gaskets, a f-13 cam, type r lifters and harland adj. rockers. i tried a set of 7.35 p/r's and they are WAY to long. i have a p/r checker on the way. the guy i bought the heads from used 7.4's, stock lifters and rockers with no problems. should the harlands and type r's change everything that much? anyone have a guess as to what lenght i will end up needing?

 

any ideas?

 

best way would be to use a PR lengh checker

 

i agree on the checker and i ordered one yesterday. just still surprised that the harlands and r's are so much different than stock. anyone have any experience with the 2??