pass on the hyd roller cam hyd roller lifters for the BBC and go for the Solid roller Xr280r-10.
Especially with nitrous. Even if free. They are being offered to you cheap for a reason.
Comp XR280r-10 cam and K-kit #K12-771-8
Set the valve lash cold at .012"in .014ex. You will never know the difference from a Hyd roller
except the far superior engine performance.
Once a year simple valve lash adjustment.
call comp cams for tech advice.
The similar Lunati Voodoo solid street rollers rock too.
238 to 244 intake duration is just right.
This snotty short duration Magnum mechanical street roller works real real well too
Comp cams Magnum CB280AR-10 # 11-691-9
280-288 238-246@.050" .623-.623" lift 110LSA
hot lash .020" .020" (set cold lash at .014" to .016")
This old Magnum rocks. Outperforms all Hyd rollers in BBC's
This does have a very cool chunky idle sound Makes huge torque.
drive vey nice on the street. Did I mention huge TORQUE ???
easy no fuss- no hassle valve lash maintenance.
Call comp cams for the right valve springs etc. Big street power and torque.
Your stock 781 heads can use some porting .
BBC's have a heavy valve train and retro hyd roller lifters are heavy too.
premature lifter float and pump up limits top end power. Jacked up spring pressure only gets you so far with a hyd on a BBC.
Not far enough. especially with nitrous.
Again you are being offered the hyd lifters for a reason.
Last edited by F-BIRD'88; 10-14-2012 at 12:00 PM.