There are no drop in hydraulic roller setups for 340 LA, if for no other reason than there is no standard pushrod length for any of the aftermarket lifter options. A mechanical roller doesn't have the height issue with a simple slug and roller tip.Hughes makes (sells) hydraulic roller lifters that have the link bar out of the way against the block and oil galley gap in correct location, but to work the design has a very tall lifter cup that needs a very short and highly angled pushrod. The pushrod length needs to be determined with a measuring pushrod with the correct ends that can be adjusted until the valve tip contact is optimal through the cam lift cycle, then sent off to a shop like Smith Brothers for a custom pushrod fabrication. There is no way around this procedure. Part of building an LA roller motor. Avoid any claims to the contrary, and avoid eBay lifters.
They only show solid roller lifters on that web site. The offset pushrod holes don't negate the need for real short custom pushrods. After doing tons of research, I like the Hughes, if you want hydraulics. You will want adjustable rocker arms. They don't need to be roller rockers, but I have not recently seen new adjustable rockers for sale that are not rollers. Also, one thing nobody mentioned yet is that as far as I know all non-Magnum heads will need to have the pushrod holes elongated to clear the more angled pushrods. That's probably a job for a machine shop, for most of us. Well, you have to take the heads off anyways to install the lifters, so that might also be something else to think about.WRONG. Stop living in the past and pay attention. http://www.mrlperformance.com/
And RRR to the rescue , am looking into them with the shop , if we can't pull 430 hp from the 340 might go with roller cam .WRONG. Stop living in the past and pay attention. http://www.mrlperformance.com/
Just put the ede heads on with the special push rods we had made , , Don't want to start pulling stuff but what the hell , want more HPThey only show solid roller lifters on that web site. The offset pushrod holes don't negate the need for real short custom pushrods. After doing tons of research, I like the Hughes, if you want hydraulics. You will want adjustable rocker arms. They don't need to be roller rockers, but I have not recently seen new adjustable rockers for sale that are not rollers. Also, one thing nobody mentioned yet is that as far as I know all non-Magnum heads will need to have the pushrod holes elongated to clear the more angled pushrods. That's probably a job for a machine shop, for most of us. Well, you have to take the heads off anyways to install the lifters, so that might also be something else to think about.