Wiped cam lobe = ported heads and roller
I went with the Isky Red-zone bushed rollers. They were not cheap, but so far so good. The bushings are pressure feed to the axle and the grooves on the lifters do not uncover the pressurized oil passages in the block/lifter bore.
The benefit is supposed to be that they give you some warning when the axle bushing starts to go away, because the lash starts to increase due to wear, as opposed to sudden, catastrophic failure with the needle bearings.
On a side note, I wish my T&D's were a solid bushing instead of needle bearings, but they refuse to make them that way. I had heard that they did make some bushed ones for special order, but they refused to do mine. Any competent machinist should be able to bush them according to a buddy that is in the machinist guild. I'm running them as is now.
Also, I did use Mike at B3 Racing to optimize my rocker geometry. It was pretty far off without his kit and custom spec'd T&D's. Great guy to work with and highly recommended.
I did upsize my pushrods to 7/16'ths Manton Stage 5 pieces. They are truly a work of art in themselves. My valve train is quieter and smoother running than I have ever heard it. After the first few lash checks. it now rarely needs any adjustment. My RB has never run and rev'd to 7K as smooth as this build does. There is a noticeable absence of nasty valve train harmonics like the ones I felt with my hydraulic set-up that nearly cost me the motor.
The concern with several brands of roller lifters, both hydraulic and solid is when the lifter moves up and down, the oil galley can be exposed by the relief on the side of the lifters. It's something to check on mock-up anyway.
I went with the Isky Red-zone bushed rollers. They were not cheap, but so far so good. The bushings are pressure feed to the axle and the grooves on the lifters do not uncover the pressurized oil passages in the block/lifter bore.
The benefit is supposed to be that they give you some warning when the axle bushing starts to go away, because the lash starts to increase due to wear, as opposed to sudden, catastrophic failure with the needle bearings.
On a side note, I wish my T&D's were a solid bushing instead of needle bearings, but they refuse to make them that way. I had heard that they did make some bushed ones for special order, but they refused to do mine. Any competent machinist should be able to bush them according to a buddy that is in the machinist guild. I'm running them as is now.
Also, I did use Mike at B3 Racing to optimize my rocker geometry. It was pretty far off without his kit and custom spec'd T&D's. Great guy to work with and highly recommended.
I did upsize my pushrods to 7/16'ths Manton Stage 5 pieces. They are truly a work of art in themselves. My valve train is quieter and smoother running than I have ever heard it. After the first few lash checks. it now rarely needs any adjustment. My RB has never run and rev'd to 7K as smooth as this build does. There is a noticeable absence of nasty valve train harmonics like the ones I felt with my hydraulic set-up that nearly cost me the motor.
The concern with several brands of roller lifters, both hydraulic and solid is when the lifter moves up and down, the oil galley can be exposed by the relief on the side of the lifters. It's something to check on mock-up anyway.