benjen

I think you are looking at it in the wrong way.........no offense meant. The extra money is for the piece of mind that there can never be any tiny needles flying around inside your engines. And yes, I do run the ISKY EZX lifters in my engines.

hogie roll

I can't believe rockers are so frequently aluminum either. Bad application there.

rmbuilder

Hogie,
The interesting thing about the use of aluminum in that application is that T&D offers a steel rocker arm as an option. The premium on the steel upgrade would be approximately $650 per set. While that premium is not insignificant, the fact that the steel rockers do not have a material driven cycle value, their service life would compensate for that premium 10 times over the lifespan of the engine. For an engine of that caliber it would seem like the steel upgrade would be a foregone conclusion.

Bob

rmbuilder

Bushed lifter bores are not a necessity in either a hydraulic or mechanical lifter scenario. What is critical is proper lifter to bore clearance. Next to compliance and lack stiffness in the valve train, improper lifter to bore clearance is responsible for more lifter failures than any other oversight. Too little clearance, you stick a lifter in a bore. Too much clearance, and lifter suffers from lack of support in the bore, excessive side loading, and 16 major oil leaks into the oiling system. Using a bushing will salvage a block that has excessive clearance or erratic bore concentricity.

Bob

MER Performance

I think many people overlook, the lifter bores. A micrometer and a dial bore gauge are a must for this job. Either a new block or a used block, it should be checked. 2 ways of fixing it; 1 with lifter truing the block with bushings or same tooling going to a .902 lifter or larger.
Most people, do not want to spend the $$$ since there wasn't a catastrophic failure before with a lifter, the issue is ignored. It would be the same as putting a engine together without checking bearing clearances.I myself use a BHJ fixture for this in my mill which has different tooling and setup fixtures, that pertain to specific blocks and deck heights.
As Bob, stated; 16 oil leaks. Those 16 oil leaks are going to affect the oil supply to the lifter and more so, using a hydraulic or a Hi Rev hydraulic lifter, that will further translate into lack of oil supply to rocker arms and cooling of valve springs.

Cole2534

iTrader: (1)

When evaluating a lifter bore, is one looking for a glass smooth finish or more of a cross hatch pattern?

Second, how prone are the lower HP Gen VI blocks to lifter bore wear? 502mags, HP 500's, etc.

MER Performance

Crosshatch pattern, about the same as a cylinder bore ( oil retention ) a block from manufacture will have machined surface allowing for oil retention, but not the same as a finish hone crosshatch.
Your second question; it will depend on many variables. Sizing of bores originally, actual lifter diameter, service intervals, has there been any valve train issues prior. You will have normal wear over time, to what point that is; you will have to determine.

Cole2534

iTrader: (1)

Thanks Mark

MILD THUNDER

iTrader: (3)

Great input here from you guys. My pants are getting tight with all this good tech talk. Now you guys got me horny for solid rollers in my next builds.

PRIMECUT

Great info as always Mark