|
|
View Poll Results: Should roller rockers be allowed on all stockers? | |||
Yes | 113 | 53.81% | |
No | 97 | 46.19% | |
Voters: 210. You may not vote on this poll |
|
Thread Tools | Display Modes |
05-27-2008, 04:53 PM | #31 |
Senior Member
Join Date: Dec 2001
Location: Elysburg, Pa
Posts: 696
Likes: 285
Liked 242 Times in 94 Posts
|
Re: Roller Rockers in Stock
The Isky ductile iron adjustable rockers have no advantage over the stock Max rockers. Both measure around 1.47. I have two sets of these and still run the same 1963 rockers I got with a stock Max engine in 72, Paul.
|
05-27-2008, 06:02 PM | #32 | |
VIP Member
Join Date: Jul 2007
Location: Anthem, Arizona
Posts: 2,766
Likes: 0
Liked 2 Times in 2 Posts
|
Re: Roller Rockers in Stock
Quote:
Don't forget your MOPAR buddies that also get to run the Isky parts as a replacement to their 318/340/360 engines factory equipped with stamped steel rockers. I think you would agree there is a considerable durability advantage in using those Isky's over stamped rockers.
__________________
Jeff Lee 7494 D/S '70 AMX Last edited by Jeff Lee; 05-27-2008 at 07:29 PM. |
|
05-27-2008, 07:54 PM | #33 |
VIP Member
Join Date: May 2006
Location: Murfreesboro TN
Posts: 4,934
Likes: 1,019
Liked 1,093 Times in 286 Posts
|
Re: Roller Rockers in Stock
Jeff, Holroyd's rockers are STOCK GM, the studs and adjusters are similar in material to the ARP rocker studs.
We can get by with the 7/16" stuff, there are even some fast cars still using 7/16" rockers. What we broke 2 years ago at Gainesville was an ARP rocker stud, it broke at the base of the threads. I was going to upgrade to the ARP Pro Series studs when a friend turned me on to Holroyd's stuff. The rockers themselves will still fail the same as the 7/16" rockers, ask a couple of the real fast guys. If you are willing to replace the rocker studs often enough (the ARP Pro Series studs are $100 or so) you can run the stock diameter studs and rockers. You MAY lose a little to deflection. NHRA allows all engines to run aftermarket studs, and even convert to screw in studs when they were not originally equipped. Some big block Chevy high performance engines came with 7/16" pushrods. We (as well as most I know) currently use 7/16" straight pushrods and GM guide plates. Again, I'd LOVE to see a solution for the rocker problem so that guys with the less popular stuff could go buy good parts for a fair price. I DO NOT want to see cars parked. However, allowing roller rockers will absolutely bring about serious unintended consequences, for the reasons I outlined earlier.
__________________
Alan Roehrich 212A G/S |
05-27-2008, 08:58 PM | #34 |
VIP Member
Join Date: Feb 2003
Location: Glendale, Arizona
Posts: 2,991
Likes: 693
Liked 1,457 Times in 543 Posts
|
Re: Roller Rockers in Stock
As long as they do not allow shaft type rocker arms in applications that were not OEM configuration, and they do not allow stud girdles, then there will not be any measurable gain in power, just reliability.
|
05-27-2008, 09:06 PM | #35 |
VIP Member
Join Date: May 2006
Location: Murfreesboro TN
Posts: 4,934
Likes: 1,019
Liked 1,093 Times in 286 Posts
|
Re: Roller Rockers in Stock
I do not agree. If you take an engine equipped with stock shaft rockers and large diameter lifters, and replace the stock shafts and rockers with 8620 or 8740 shafts and big roller rockers, you can EASILY exceed what can be achieved with stud mounted rockers and no stud girdle, even WITH roller rockers. Otherwise, there's be no market for stud girdles, and there'd be no shaft rocker conversions.
__________________
Alan Roehrich 212A G/S |
05-27-2008, 09:44 PM | #36 | |
VIP Member
Join Date: Feb 2003
Location: Glendale, Arizona
Posts: 2,991
Likes: 693
Liked 1,457 Times in 543 Posts
|
Re: Roller Rockers in Stock
Quote:
By the way, both the Mopar and Ford FE's, already have a big OEM lifters, and they also are fast. Last edited by SSDiv6; 05-27-2008 at 09:46 PM. |
|
05-27-2008, 10:02 PM | #37 |
VIP Member
Join Date: May 2006
Location: Murfreesboro TN
Posts: 4,934
Likes: 1,019
Liked 1,093 Times in 286 Posts
|
Re: Roller Rockers in Stock
I'm well aware of that. In fact, going back a few years, I was working on a Tunnel Port in a Shelby, and I learned VERY quickly about the strength difference between the stock replacement style rockers and the aftermarket roller rockers. There is a major difference, at least in my experience.
__________________
Alan Roehrich 212A G/S |
05-27-2008, 10:30 PM | #38 |
Member
Join Date: May 2002
Location: San Angelo Tx
Posts: 231
Likes: 0
Liked 0 Times in 0 Posts
|
Re: Roller Rockers in Stock
So why do you need to spend 15,000 on a motor.There are a lot of racers that don,t have that much in there car.
__________________
Alan Warman STK 4107 |
05-27-2008, 10:49 PM | #39 |
Junior Member
Join Date: Mar 2008
Posts: 11
Likes: 0
Liked 0 Times in 0 Posts
|
Re: Roller Rockers in Stock
|
05-27-2008, 10:51 PM | #40 |
VIP Member
Join Date: Jul 2007
Posts: 1,330
Likes: 887
Liked 720 Times in 151 Posts
|
Re: Roller Rockers in Stock
And some of those guys are the guys that bitch when there car isn't fast. They don't work on them and they want rules changed so it is easier for them to compete with the guys that put in double the effort and money. If you take the time to learn and work hard you can build a combo to run fast for less, but if you know nothing and don't want to learn then you are going nowhere.
__________________
Todd Hoven 1035 Stock |
|
|