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My GMC has 161000 miles and it is still on the factory rollers.
Do you happen to know what the lift, duration and spring pressure that has? 
No I do not but it is all relative if you are building a motor that is more street than race you can stick a nice hyd roller in it that will make good power and last a long long time.
my last vette that I played with had a hyd roller with .560 lift and 248@.050 and the spring was 160# on the seat and that motor had 70K on it when i sold it and the new owner beat on it for years to come with 0 problems.
It was a 6 speed car with 4:10 gears so trust me when I say it was beat on hard.
70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake
best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
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