"Old School" Stocker Cams

[Cbrinson47]

Originally Posted by Todd Hoven

Listen, it’s a bad idea. When guys are breaking flat tappets and other valvetrain parts it’s time to get help from someone who knows what they are doing, because they don’t . Or they need to ramp up their maintenance program. Changing the rules for racers that can’t build reliable engine is stupid. I’ve made about 200 runs with the Coronet. It has a flat tappet cam as per the rules, and we have never broken a valvetrain part during my time as the driver. It’s a Hemi in that with not the best valvetrain geometry. So there is a great example of when something is assembled with the right parts how good the reliability can be.

Not really worried about an internet discussion how I’m perceived about this. I think it’s a bad idea and I spoke up about it.

So you think just allowing roller lifters is going to make this a cheap sport and make everybody reliable? You don’t think anybody’s going to exploit that and make the engines run harder than they do right now with these new parts? Then we all have to buy a roller lifters and roller cam to keep up. Then we all have to buy roller lifters and roller cams to keep up. How many good Stock eliminator racers are looking for a roller lifters for their engine? More or less than 10? Wie will have 10,000 RPM 396s, then how much money are we going to spend to keep up with them? BTW, you can get quite a bit of performance out of lower valve spring pressures if the right parts are used.

NHRA screwed up stock when they allowed any spring pressures.

[GTX JOHN]

Originally Posted by Dan Fahey

I think you meant ..."you are" or "you're"..and..."welcomed here !!"
Try again !

d

I believe "your" is correct in the context it was used.

However, I graduate High School in mid 60's.

Also ( As my X Wife would explain to you ) =
I am generally wrong all the time!

[Stan Weiss]

I dug up some old data. This is the lifter raise for a Lunati sticker cam for a 302 Z28 from the mid '70s.Let me add that by the time I got to check the cam it was used.



Stan

[GTS340]

I remember we put what was called a 7000 plus Cheater cam in a 1868 Dart GTS 340. This was around 1975. Best camshaft way back that I had was a G K that McElroy had something to do with. That was around 1980.
Had Rhodes lifters and 273 adjustable rocker arms. With some pencil neck pushrods compared to todays. Those good old days when tuning was an art and records were set.

Paul Haszlauer

[SSDiv6]

Originally Posted by GTS340

I remember we put what was called a 7000 plus Cheater cam in a 1868 Dart GTS 340. This was around 1975. Best camshaft way back that I had was a G K that McElroy had something to do with. That was around 1980.
Had Rhodes lifters and 273 adjustable rocker arms. With some pencil neck pushrods compared to todays. Those good old days when tuning was an art and records were set.

Paul Haszlauer

General Kinetics 041/560 grind number, the best Mopar cam grind before the rules were changed. You could balance the lifter on the lobe. It was designed by the Don Twelles, the owner of GK, one of the brightest cam designers ever and was a former Ford engineer. He designed also the cams for Grumpy Jenkins in the early days of Pro Stock.

[Ralph A Powell]

And Gapp and Roush. I herd that he was working for Roush after he closed his shop.

[Mike Taylor 3601]

I can say,I have ran under the old style rules spring pressure and lift, duration and overlap and it having to check.... and I have and do run under current rules....
I would pick current rules on cam,lifters and springs...been there done the stock pressure spring,which was checked...and duration overlap....
my IHRA pure stock combo 305/160/230 ABSOLUTELY ate springs and valves and it LOVED the taste of them... if nothing went wrong about 35-50 runs heads were coming off for valve job, valves and springs....

present rule stocker... I have one right now in D3 with 3 seasons on engine and same springs... had one with 500 runs on cam and lifters...had 300+repeatedly

I will take current rules on springs...
however if I built another stocker it would be a roller cam car... no other reason than eliminating cam break in...

[James L Miller]

Any of the Mopar 340 guys ever run either of these cams? I think the Lunati is from the 1990s, GK maybe the 1970s?

[Cbrinson47]

Originally Posted by Terry Cain

They actually checked lift and duration. Also checked springs.

You forgot.......they also checked overlap !

[Cbrinson47]

Originally Posted by Dwight Southerland

If the valve spring pressure were reduced, after a period of adjustment there would be no more carnage than allowing roller lifters and it would be a whole lot cheaper for the majority of racers.

I would say 150 lbs seat pressure and 350 lbs open pressure max !