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-   -   big base circle cam in stock elem. (https://classracer.com/classforum/showthread.php?t=52199)

Jim Hanig 03-13-2014 11:30 AM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by Pedigo Perf (Post 424205)
Trust me, they definately do check for it. And pulling the cam out is apparently necessary to measure it. Not much fun, and hard on the tennis elbow when your balancer is as tight as mine is. Fortunately I had a stock size cam bore but I had intended to go with a 55mm but just didn't get it done in time.

I have an email indicating the large core cam is ok as long as you aren't using roller cam bearings. I will try to find it and post it if I can.

Tracy
Granted they did ck yours how many more have they cked ?

Bill Diehl 12-23-2014 10:59 PM
Re: big base circle cam in stock elem.
 
So what's the verdict here? Roller cam bearings? 60mm tunnel? offset lifters? Lifter dia?


lot of grey area to sort thru

impstocker 12-23-2014 11:35 PM
Re: big base circle cam in stock elem.
 
In the spirit of "there are no stupid questions" what is the advantage of a large base circle cam in a Stocker motor? I know in a Comp motor where they RPM 9500-10000+ My 396-325 never went over 6800 and if it did lose power. Thanks Learn me something.

Will Lamprecht I/S 65 396/325 HP in progress

my69396 12-23-2014 11:42 PM
Re: big base circle cam in stock elem.
 
Does this mean that a ford can have roller bearings as they are the stock size and a ford part number?

Bruce Noland 12-24-2014 12:04 AM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by Bill Diehl (Post 456153)
So what's the verdict here? Roller cam bearings? 60mm tunnel? offset lifters? Lifter dia?


lot of grey area to sort thru
60 mm tunnel, offset lifters, lifter diameter. What are you talking about? You went back 9 months for this? Do you race Stock or Super Stock?

Adger Smith 12-24-2014 04:06 AM
Re: big base circle cam in stock elem.
 
To quote Bobby " If it's not in the rule book it cannot be enforced. If that was the case they could make up any rule they wanted to and bounce someone just because they wanted to."
Dwight hit the nail on the head.
But you guys have forgotten about "The other Rule Book"
We may not be able to read it because "They Have It" It is called the " NHRA TECHNICAL POLICIES & PROCEDURES" manual. That is where the real rules that the Tech Dept follows are written. It pin points area like what is being discussed. Every Div Tech director should have one, somewhere & there should be one at every NHRA race. Between the "Rule Book" we get and their TECHNICAL POLICIES & PROCEDURES there should be no problem being consistent with rules.
BTY: This is the same manual that the AHFS rules and procedures are listed in.

Bill Diehl 12-24-2014 08:42 AM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by Bruce Noland (Post 456162)
60 mm tunnel, offset lifters, lifter diameter. What are you talking about? You went back 9 months for this? Do you race Stock or Super Stock?
You will see me this year


C/S and D/S Boss 351 Ford

Bill Diehl 12-24-2014 08:49 AM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by impstocker (Post 456158)
In the spirit of "there are no stupid questions" what is the advantage of a large base circle cam in a Stocker motor? I know in a Comp motor where they RPM 9500-10000+ My 396-325 never went over 6800 and if it did lose power. Thanks Learn me something.

Will Lamprecht I/S 65 396/325 HP in progress
It is all about making the valvetrain stable at the rpm you mentioned, you are correct, not every combo can run up there and make power, but some can


Nascar...... .875 dia, flat tappet, 60 mm 9000+ all day long with almost 0 valvetrain breakage


Most stockers have "square" lobe cams.....think about that for awhile


Edit....the rulebook specifies "lift" as far as I am concerned that is all they should be checking, weather its at the valve and/or at the cam

Pedigo Perf 12-24-2014 09:39 AM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by Bill Diehl (Post 456175)
You will see me this year


C/S and D/S Boss 351 Ford
Only 8 days left, better hope for good WEATHER.

TILBURG 12-24-2014 12:40 PM
Re: big base circle cam in stock elem.
 
Quote:
Originally Posted by Bill Diehl (Post 456153)
So what's the verdict here? Roller cam bearings? 60mm tunnel? offset lifters? Lifter dia?


lot of grey area to sort thru
Offset lifters? In a flat tappet BOY that will keep you busy.LOL


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