Lifters In Stock Eliminator

[GUMP]

So, is the inferior parts thing a myth? Is it still possible to build flat tappet combinations that will be reliable with new parts that are currently available? Not older parts that you just happen to have.

[JGrossijr]

It's a combination of things, but IMO the biggest factors are lubrication, ramp speed, and valve spring pressure.
Light oils, windage reduction, aggressive ramp speeds, and higher valve spring pressures, all improve performance but reduce reliability. The main culprit of flat tappet failures in Stock was allowing increased valve spring pressure. Careful what you wish or lobby for. The rule of unintended consequences never goes away.

[goinbroke2]

I run flat lifters and am super paranoid about break in procedure. 50# on the seat and ensure it fires(timing/fuel/fans/etc) run for 30-45 minutes 2-2500 rpm. I have never in my life wiped a cam and don't plan on it now. If I do, it will not be because of me.

Pull the 50# springs and Install correct springs, good to go.

[GTX JOHN]

My understanding is that the quality of the cast core (If you still use them)
has deteriorated significantly in the last number of years. the "CWC"
casting cores are extremely difficult to impossible to find anymore.

Dozens of Horror Stories on the forums.

If the lifters do not rotate, the cams go flat in a real big hurry!

[pmrphil]

Originally Posted by GTX JOHN

My understanding is that the quality of the cast core (If you still use them)
has deteriorated significantly in the last number of years. the "CWC"
casting cores are extremely difficult to impossible to find anymore.

Dozens of Horror Stories on the forums.

If the lifters do not rotate, the cams go flat in a real big hurry!

But then again, John, if the lifters don't rotate, most likely the cam was ground incorrectly, probably not enough (or too much) taper on the lobe.
Luckily Mopars have a larger diameter lifter, that's a plus.

[Stan Weiss]

Originally Posted by pmrphil

But then again, John, if the lifters don't rotate, most likely the cam was ground incorrectly, probably not enough (or too much) taper on the lobe.
Luckily Mopars have a larger diameter lifter, that's a plus.

While they are called flat tappets, they are not, and they need to be matched to the amount of taper on the lobe.


Stan

[Frank Castros]

If Charlie Wescott is listening this may be an opportunity for Militia to make some hay.

[GTX JOHN]

Originally Posted by pmrphil

But then again, John, if the lifters don't rotate, most likely the cam was ground incorrectly, probably not enough (or too much) taper on the lobe.
Luckily Mopars have a larger diameter lifter, that's a plus.

However, often it is the crappy quality or metallurgy of the new Chinese lifters
or sloppy machining that causes them not to rotate. Flat tappet
lifters are also not flat either (At least to start with hopefully)

[Mark Ugrich]

Maybe this will help someone. Daniel Powell is a pretty sharp guy.

[Gary Smith]

Anyone use Hylift Johnson (Topline)? We sell them under the Erson brand, used on cams with springs @ 120 seat / 300# over the nose and haven't heard of any failures (knock on wood). Precision Products is probably the best, but I would think HJ Toplines are decent for less money.