Lifters In Stock Eliminator

[MR DERBY CITY]

Originally Posted by JP1738

Why? Forcing combos to use inferior parts that others are granted permission to use seems punitive. Explain plz.

It is real SIMPLE, your 305 DID NOT come from the factory with roller lifters ….For Pete’s sake ?..

[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

[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)

[Jeff Stout]

Built a 350 Chevy for a hobby stock dirt car. He insisted the hole in lifter face was the way to go. I said that its not a great idea. 2 Cam lobes and 2 lifters were worn out. It took the center of the lifters and put major cups in face with the .015 hole opened to around .080 hole size.
Anyone take their lifters and cams and get frozen. Works great on valve springs and brake rotors.

[JP1738]

Originally Posted by MR DERBY CITY

It is real SIMPLE, your 305 DID NOT come from the factory with roller lifters ?.For Pete?s sake ?..

I don't think it's that simple. Is there a significant performance advantage to roller lifters that I don't know about (outside of reliability of course)? The engine doesn't have factory rods/pistons but they are legal as long as they are the right size, why not put better lifters in it too?

I genuinely do not understand. If you are trying to say that running flat tappet cams keeps the racing more pure to it's origin and makes the entry level more difficult and punishing to choose that combination, then just say that. I may not like it, but at least it's a fair point. After all, I chose the combination that uses them, now I have sleepless nights because of it.

Frankly, I like the idea of using newer technology to improve longevity and my quality of life lol.