valve train
#1
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valve train
I saw a pic of a BBC setup and it had billit pieces of alum that fit together and bolted above the rockers. It totally covered the rockers and looked to be 1\2 inch thick . i was wondering if anyone could explain what these are and any further info about them.
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#4
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No such thing as Gen 4. There's Mk IV, then Gen 5 and Gen 6.
Most Gen 5 and all Gen 6 blocks are machined for the dogbone style retainer needed to run OEM style hydraulic roller lifters. If a Gen 5 block is not machined for them, it can be done easily enough.
Mk IV blocks are not machined for the dogbones, and they require a "retrofit style" hydraulic roller lifter with tie bars. They are more expensive than the OEM style dogbone lifters and also require different pushrods.
All you need to convert a Mk IV to a hydraulic roller setup, though, is a bronze distributor gear, a set of retrofit hydraulic roller lifters, matching pushrods, a hydraulic roller cam, and a cam button to keep it from walking back and forth in the block.
Stud girdles are not necessary. Roller rocker arms are not even necessary.
Usually, though, if you are converting to a hydraulic roller from hydraulic flat tappet, you want to upgrade the springs and add roller rocker arms too.
MC
Most Gen 5 and all Gen 6 blocks are machined for the dogbone style retainer needed to run OEM style hydraulic roller lifters. If a Gen 5 block is not machined for them, it can be done easily enough.
Mk IV blocks are not machined for the dogbones, and they require a "retrofit style" hydraulic roller lifter with tie bars. They are more expensive than the OEM style dogbone lifters and also require different pushrods.
All you need to convert a Mk IV to a hydraulic roller setup, though, is a bronze distributor gear, a set of retrofit hydraulic roller lifters, matching pushrods, a hydraulic roller cam, and a cam button to keep it from walking back and forth in the block.
Stud girdles are not necessary. Roller rocker arms are not even necessary.
Usually, though, if you are converting to a hydraulic roller from hydraulic flat tappet, you want to upgrade the springs and add roller rocker arms too.
MC
#7
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At what point is a stud girdle recommended? I'm running a .623 lift hydraulic roller cam with ISKY tool steel endurance springs, I think about 150lbs closed pressure, Pro Magnum roller rockers, with a 6000rpm redline.