Pure Stockers New Camshaft Rule !!!

[ALMACK]

Originally Posted by X-TECH MAN

Just had a brain fart and suggestion.......Have Mike Baker make the valve spring pressures to no more than 150lbs lbs closed and no more than 350 lbs open (no higher) for every brand, HP, and year. Not enough to turn the hi RPM's or wear out lobes and lifters but enough to follow the cam lobe without all the exotic junk and you can still drive it on the street. Just have to check some of the spring pressures in tear down and cam lift. Not a hard or time consuming job. Makes everyone on a same same basis if the duration and overlap rule is tossed out.

Great idea !

[FINESPLINE]

Terry, You and I opened the book to the same page. Great idea having a rule on the open and closed pressures and taking the max published OEM spring as the bar. When you posted the LOL, I knew we were thinking the same thing.

[Dan Fahey]

Originally Posted by FINESPLINE

Terry, You and I opened the book to the same page. Great idea having a rule on the open and closed pressures and taking the max published OEM spring as the bar. When you posted the LOL, I knew we were thinking the same thing.

Terry thanks for the feedback.
This may actually attract more racers to run in Pure Stock.


D

[HandOverFist]

Well thought out and conceived...congrats! Now, if the powers that be will agree.

[Mike Taylor 3601]

That's good ideal,Terry although that would almost double my spring pressure
I figured your LOL comment was either you was wound up and just said forget it and put LOL.but it appeard you were in thinking mode and went well.,I expected to hear from you sooner though,LOL
I can check durations,and @ times have thought maybe I just easier to give up on racing and try to get tech job,but I know specs just are'nt available for later stuff,which I figured was anything after 86. I came up w/spring spec solution and Jim Woods was interested in getting it,was SBI catalog it has spring pressure specs for practically anything,and is probraly pretty accurate,every spec I have ever compared,between it and the AERA prosis program match,for those who don't know that is Automotive engine rebuilders association,prosis is program they sell that has engine specs,casting#,bulletins,etc. for practically any engine ever made,some I never heard of or seen,but no it does'nt have duration specs before anyone ask.

150/350 sounds good to me but a guy w/69 440-6pack might disagree,as I would be almost doubling my spring and he would be the same as he was.

I believe Terry's ideal is good150/350 is about right elimnates advantage of high dollar lifters etc,would. keep pure stock as pure as possible,due to basically a lack of information,and they call this the information age,kinda ironic,LOL

As far as pure stockers go I probaly have the most checked car,has been through teardown 5 times since 99, was checked by Mike Baker/Duane Eiskant 1st then by Bill Felker/Hank Blankenship,then by Hank and Jim Woods and by Jim twice.
duration never was checked,beside when I did it when I put cam in,the springs were checked when spring tester was in trailer,there was specs for my cam to check it.
Hey Terry,just thought of something think same guy who has overdue book could have spring tester also.LOL
Mike Taylor 3601

[X-TECH MAN]

Well guys....its up to you and Mike Baker. I just threw out a suggestion that was the only thing I came up with to control the use of expensive and exotic parts that would have to be used if unlimited spring pressures were used. I have done cyl. heads for race cars, and street rides since 1969. the 150/350 is really about all the flat tappet cams can stand with OEM type lifters. They can stand more but wont last long on the street or continued use. The OEM roller cam guys can use more but why not make it the same for everyone. I dont think the 440 six pack guys would complain as a true 440 with non ported heads/heavy OEM rods/heavy pistons/etc. dosent like a lot of RPM anyway. The pressures I suggested are 30 lbs heavier on open pressure for the 6 pack anyway and open pressure is more important than the closed pressure if the closed pressure is enough to close the valve. I used to use 110 closed and 280 open on a bracket motor (350 Chevy) and it would buzz to 7200 RPM easy with a fairly stout cam in it. My old 68 Z-28 would turn 7400 RPM with a stock OEM cam nd only 84 lbs on the seat and 206 open. If anyone has any other ideas Im sure Mike Baker will listen. Maybe a name change for the catagory would help some of the critisim of the catagory as they havent be "Pure" for a very long time.
I like Jr. stock but I like it because of that was a FUN time in drag racing for me. Best of luck.

[Dan Fahey]

I would suggest something more moderate like 130lb Seat to keep the ET difference from Stock a bit wider.

[X-TECH MAN]

Originally Posted by Dan Fahey

I would suggest something more moderate like 130lb Seat to keep the ET difference from Stock a bit wider.

Only thing is the 440 six pack and the 70-71 Street Hemi has 150 as the factory pressure rating on the seat. I believe the 66-67 solid lifter Street Hemi has around 166 lbs for a factory rating with dual springs. I believe the Boss 429 Hemi Ford has 145 seat pressure but Ive never heard of one running in Pure stock after all these years. Something to think about but Im not involved anymore. You might not get a hold of Mike Baker unless its today until after the New Year so there is time to consider all options.
P.S. I just noticed the 1963 Max Wedge Dodge and Plymouth has 142 lbs on the seat for a factory spec. so 130 Lbs max might affect or might not affect some of these cars if anyone is running one. I think Phil Baldiccno (sp?) is still running his 1963 Max Wedge in A/PS?

[HandOverFist]

Originally Posted by X-TECH MAN

Only thing is the 440 six pack and the 70-71 Street Hemi has 150 as the factory pressure rating on the seat. I believe the 66-67 solid lifter Street Hemi has around 166 lbs for a factory rating with dual springs. I believe the Boss 429 Hemi Ford has 145 seat pressure but Ive never heard of one running in Pure stock after all these years. Something to think about but Im not involved anymore. You might not get a hold of Mike Baker unless its today until after the New Year so there is time to consider all options.

My bet is most who own such a car are not going to drive them to the track, much less take them down it hehe.

[Dwight Southerland]

Originally Posted by X-TECH MAN

Only thing is the 440 six pack and the 70-71 Street Hemi has 150 as the factory pressure rating on the seat. I believe the 66-67 solid lifter Street Hemi has around 166 lbs for a factory rating with dual springs. I believe the Boss 429 Hemi Ford has 145 seat pressure but Ive never heard of one running in Pure stock after all these years. Something to think about but Im not involved anymore. You might not get a hold of Mike Baker unless its today until after the New Year so there is time to consider all options.
P.S. I just noticed the 1963 Max Wedge Dodge and Plymouth has 142 lbs on the seat for a factory spec. so 130 Lbs max might affect or might not affect some of these cars if anyone is running one. I think Phil Baldiccno (sp?) is still running his 1963 Max Wedge in A/PS?

I like the 130 lbs. on the seat much better than 150. Easier on camshaft break in, the pocket book and finding parts. These exceptions you list would just have to adjust if they want to race. Who says the rule has to provide an advantage or retain the 'purity' factor? It's all just numbers on paper and rules to run by.