Lifters In Stock Eliminator

[Rick J]

Originally Posted by Mike Taylor 3601

How many of those stockers with larger than oem diameter lifters have been through teardown? and passed?

Don't know, I was helping a guy do a freshen up on his combo, got the dial caliper out, told him the lifters were oversized, he said they are fine and to finish the build, so I did and never mentioned it again.

[Alan Roehrich]

Originally Posted by Mad Manz

Sorry in advance but I am new to the stocker stuff.
AS for lifters in Chevy's 396/325hp to be exact the rule book says you can install lifter bore bushings.
My question is when I do this can I put the .904dia lifters in or do I have to stay with the GM .842 dia lifter

You can. But if you get torn down, you're getting a DQ, and probably a fine, as well as some time off.


I was actually just discussing this yesterday, with a very high ranking NHRA tech person.


In Stock Eliminator, the OE lifter diameter MUST be retained.

[Rick J]

Lifter diameter needs to be defined, so does lifter bore angle.

[Larry Merk]

It is NOT an UNWRITTEN rule.

Page 21 of the NHRA 2025 Rule Book states "On the other hand, as to performance equipment, it is the general rule that unless optional performance equipment or performance-related modification is specifically permitted by this Rulebook, it is prohibited."

Section 11 covering Stock Eliminator under Camshaft/Lifters makes no mention of changing lifter diameter. Therefore it is illegal to do so.

[Lenny5160_v2]

Originally Posted by Larry Merk

It is NOT an UNWRITTEN rule.

Page 21 of the NHRA 2025 Rule Book states "On the other hand, as to performance equipment, it is the general rule that unless optional performance equipment or performance-related modification is specifically permitted by this Rulebook, it is prohibited."

Section 11 covering Stock Eliminator under Camshaft/Lifters makes no mention of changing lifter diameter. Therefore it is illegal to do so.

Considering how the rule is worded, could it be argued that an increase in lifter diameter is not a "performance-related modification"? As in, the modification should increase strength/reliability, but not performance.

[Stan Weiss]

Originally Posted by Lenny5160_v2

Considering how the rule is worded, could it be argued that an increase in lifter diameter is not a "performance-related modification"? As in, the modification should increase strength/reliability, but not performance.

Remember max velocity is limited by lifter diameter. So a larger lifter diameter lets you use a cam with a greater max velocity. There is a performance increase in doing that.


PS If you look in the Comp Cams Master Lobe List you will see that they have a number of lobe profiles that only will work with a .904" lifter.


Stan

[Alan Roehrich]

For anyone who thinks it is okay, or thinks it is a "gray area", people have been DQ'd and suspended for it.


Oh, just write Glendora and try to get a letter on official letter head accepting/allowing it.


Funny thing is, if you don't have the cam lobes designed for the bigger lifters, you're not gaining anything, you're just illegal for no reason or advantage. There are probably some lobes out there, but are they even the lobes you'd actually need, and are they even modern designs that are fast?

[Mad Manz]

Thanks for the replies. I think I will staying with the .842 dia lifter. Im just making sure i'm totally legal.
As far as lifters themselves what are the best tool steel solid lifters out there?