big base circle cam in stock elem.

[Jim Hanig]

Originally Posted by Pedigo Perf

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]

So what's the verdict here? Roller cam bearings? 60mm tunnel? offset lifters? Lifter dia?


lot of grey area to sort thru

[impstocker]

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]

Does this mean that a ford can have roller bearings as they are the stock size and a ford part number?

[Bruce Noland]

Originally Posted by Bill Diehl

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]

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]

Originally Posted by Bruce Noland

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]

Originally Posted by impstocker

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]

Originally Posted by Bill Diehl

You will see me this year


C/S and D/S Boss 351 Ford

Only 8 days left, better hope for good WEATHER.

[TILBURG]

Originally Posted by Bill Diehl

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