CLASS RACER FORUM
Page 1 of 19 1 2311 Last »
Show 40 post(s) from this thread on one page

CLASS RACER FORUM (https://classracer.com/classforum/index.php)
-   Stock and Super Stock (https://classracer.com/classforum/forumdisplay.php?f=3)
-   -   Pure Stockers New Camshaft Rule !!! (https://classracer.com/classforum/showthread.php?t=50922)

Steve Stickel 12-17-2013 01:22 PM
Pure Stockers New Camshaft Rule !!!
 
From the 2014 IHRA Rule Book... Pure Stock lost a little "Purity" today .. This is posted for the guys who might have a cam on order or will be soon..

12/10/13
p. 48 Pure Stock: Camshaft: Camshaft must retain stock lift for horsepower claimed per IHRA Technical Bulletins. OEM duration and overlap is optional


Can't get too crazy as the valve springs still have to check at OEM pressures, open and closed. Guess this was changed to speed up tech / tear down or maybe lack of data supplied by the OEM's?

Tar Heel 12-17-2013 01:32 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Quote:
Originally Posted by Steve Stickel (Post 412859)
From the 2014 IHRA Rule Book... Pure Stock lost a little "Purity" today .. This is posted for the guys who might have a cam on order or will be soon..

12/10/13
p. 48 Pure Stock: Camshaft: Camshaft must retain stock lift for horsepower claimed per IHRA Technical Bulletins. OEM duration and overlap is optional


Can't get too crazy as the valve springs still have to check at OEM pressures, open and closed. Guess this was changed to speed up tech / tear down or maybe lack of data supplied by the OEM's?
Wow! Thanks for posting that. Thanks also to IHRA for changing this a few months after I had Bullet grind a Pure Stock cam with STOCK duration. I could have really went fast if I wasn't restricted to that. Ugh! :mad:

countrypuppy4865 12-17-2013 02:39 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Sounds like 10 second pure stock cars are just around the corner!

Dan Fahey 12-17-2013 03:29 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Quote:
Originally Posted by Steve Stickel (Post 412859)
From the 2014 IHRA Rule Book... Pure Stock lost a little "Purity" today .. This is posted for the guys who might have a cam on order or will be soon..

12/10/13
p. 48 Pure Stock: Camshaft: Camshaft must retain stock lift for horsepower claimed per IHRA Technical Bulletins. OEM duration and overlap is optional


Can't get too crazy as the valve springs still have to check at OEM pressures, open and closed. Guess this was changed to speed up tech / tear down or maybe lack of data supplied by the OEM's?
What does OEM duration and overlap optional mean?

OK.. emailed Mike Baker ..and it is true.
Can use any OEM Spring.

This is Mike's response to my email..
"If it is oem design and size it is ok"

D

HandOverFist 12-17-2013 03:38 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Quote:
Originally Posted by Dan Fahey (Post 412873)
What does OEM duration and overlap optional mean?

D
I think it means they didnt want to copy/paste the NHRA rulebook for Stock...not a bad idea in itself. :p

Lyn Smith 12-17-2013 04:20 PM
Re: Pure Stockers New Camshaft Rule !!!
 
I can finally retire my General Kinetics special Pontiac lobe(thats what they called it even though it was in a Buick) stock duration cam i had made in 1980 .I think i will mount it on a board and put it on the wall in the man cave.LOL

Bob Pagano 12-17-2013 05:08 PM
Re: Pure Stockers New Camshaft Rule !!!
 
I know one that will go 10s 67 vette 427- 400 for sure.

FINESPLINE 12-17-2013 05:37 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Do you think the IHRA just cracked open their version of Pandora's box by loosening the camshaft rules ?

ALMACK 12-17-2013 07:03 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Holy Cow !
As an owner of a Pure Stocker, I'm not sure if that is good or bad ?

Thanks for posting that.

ALMACK 12-17-2013 07:11 PM
Re: Pure Stockers New Camshaft Rule !!!
 
Quote:
Originally Posted by Dan Fahey (Post 412873)
What does OEM duration and overlap optional mean?

OK.. emailed Mike Baker ..and it is true.
Can use any OEM Spring.

This is Mike's response to my email..
"If it is oem design and size it is ok"

D
Dan:

Am I reading this correctly ?

ANY valve spring can be used (regardless of measured pressure) as long as it looks OEM ?


All times are GMT -4. The time now is 05:37 PM.
Page 1 of 19 1 2311 Last »
Show 40 post(s) from this thread on one page

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2025, vBulletin Solutions Inc.
Copyright Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.