Re: Lifters In Stock Eliminator
 

There's all sorts of illegal stuff out there in Stock Eliminator.


That doesn't mean you should do it. Or that you can pass tech if you do.

Re: Lifters In Stock Eliminator
 

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

Re: Lifters In Stock Eliminator
 

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.

Re: Lifters In Stock Eliminator
 

Hey Azzhole, I have asked you very kindly to refrain from commenting on my posts, AND I am not a very KIND person. I do not give 2 Shyts about you, your opinion OR your (. ). car……MJ Quinn

Re: Lifters In Stock Eliminator
 

Ok , so now we are back to only 2 sexes …..just like oversized lifters in stock eliminator , it does not affect me ….

Re: Lifters In Stock Eliminator
 

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.

Re: Lifters In Stock Eliminator
 

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

Re: Lifters In Stock Eliminator
 

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?

Re: Lifters In Stock Eliminator
 

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?

Re: Lifters In Stock Eliminator
 

PPPC

Re: Lifters In Stock Eliminator
 

If bigger diam lifters, bigger cam diam didn't work , SS,comp and Pro Stock would not have lifters over one inch diameter/ huge wheels and 70 plus?s mm cams. It is a performance advantage.

Re: Lifters In Stock Eliminator
 

Trend.

Re: Lifters In Stock Eliminator
 

Yes, and if you can't increase cam core and/or lifter diameter, lofting the valvetrain reduces friction and adds hp, but some prefer keeping the lifter in constant contact with the lobe.

Re: Lifters In Stock Eliminator
 

In a thread on another forum they were talking about that many years ago Isky sold "Chilled Iron lifters". If someone today could manufacture these it might solve the problem.


Stan

Re: Lifters In Stock Eliminator
 

The Isky chilled iron lifters are not harder than either the tool steel or the Johnson Hy-Lift hardened tappets. The only thing harder is carbide or ceramic.

Re: Lifters In Stock Eliminator
 

Alan,
That was talked about in the pages I posted.


Stan

Re: Lifters In Stock Eliminator
 

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

Re: Lifters In Stock Eliminator
 

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.

Re: Lifters In Stock Eliminator
 

I'm of the opinion that the tech department should put the OE lifter diameter rule in writing right now, and give everyone a year to comply, since it is a labor intensive and costly switch.

Re: Lifters In Stock Eliminator
 

Or Titanium

Re: Lifters In Stock Eliminator
 

Titanium is entirely unsuited for a sliding interface application. Especially against cast iron or steel.

Re: Lifters In Stock Eliminator
 

It's been common knowledge for DECADES that lifters are to remain OE diameter. Yep, we all know there are a number of cars out there that are running bigger lifters. Again, if you haven't had someone make you a lobe designed to take advantage of it, you're not gaining a thing.


It's just like there a number of cars out there with amazingly illegal heads. The rules forbid it, everyone knows it, and some choose to roll the dice. There was once hope that NHRA would police it, they brought Wesley back for a while, but then they over ruled him enough that he quit again.


NHRA is extremely unlikely to write any new rules for Stock. That would mean that they would be expected to expend the resources to enforce the rules.

Re: Lifters In Stock Eliminator
 

I've used nascar .875 lobes on .842" lifters, and spun to 8200 with 1.300" valve springs, I'm aware of all you've said.

Yes, NHRA not likely to invest or do anything to enforce integrity in the class.