Whistler

iTrader: (46)

The valve springs and retainers on Patriot Stage 2 heads are too large and rubbed the bottom of the rocker arms with the valve closed. Mike Norris here in Orlando had the same problem with 2 sets he has installed.

The solution is to machine about .050 off the bottom of the rocker arm or buy a set of aftermarket rockers... neither of which are appealing.

KRAZY K 2000 TA

iTrader: (5)

MAN that aint good had plans on getting my self a set for my BDAY on the 5th that would ruin my day where exactly do u machine the rockers i have a machine shop at work

TVWilkes

When you use 1.46 dia style dual springs the rockers will be close.

Here is a link to the Rocker after it is altered.

http://www.ls1howto.com/index.php?category=3

If you purchase any sponsors head and it was offered with 1.43 or 1.46 dia dual springs the rocker may have to be cleared.Other sponsors offer these springs as an option.Our Stage 2 head comes Standard with them.

Thanks,

Mustang Hat'r 2

iTrader: (24)

I noticed I had a couple of marks on mine when I swaped the valves. I took a little of with a file and so far so good. My heads are milled .015 so dont know if that had anything to do with it. I know I didnt take off no .050 with that file maybe .010 or .015 was a PITA

Drew778

iTrader: (2)

Terry, about how much needs to be taked off?

TVWilkes

I would take off a small amout with a die grinder or dremel tool ( about .03 to .05 ) .

Pro Stock John

iTrader: (34)

You mean you need to notch the underside of the rockers?

It's easy to do.

I have mixed feelings when I see threads like this, there are not a lot of springs that work well for our applicataions so you have to work with what's out there.

v8maro

iTrader: (4)

If heads and a cam were sold to you as a 'package' do you think that a set of correct rockers or an aftermarket set should have been included??
-Steve

Hannibal

Terry - what are you saying here?

My heads were just swapped - no modifications to anything else (as it came completely assembled) nor was I told of any needed modifications.

Should I have done something that I didnt?

TVWilkes

Hannibal,
I have seen some of the rockers be close.Not everyone's rockers needs clearing.I tested to see if the factory rockers cleared.In my test they did.Some people have told me now theirs are close or barely touching.I now include a notice to check this area.

Hannibal

Not to ask a dumb question but this area is new to me:

If I had this problem, would there by any other symptoms that are noticable other than marks on the rockers?? I may not even notice them as being marked up if I went home and pulled them off. Any other way to tell?

What issues would this lead to uncorrected?

Drew778

iTrader: (2)

ttt

Whistler

iTrader: (46)

Terry, I'm not bahsing your product because I understand that this diameter spring will cause clearance issues regardless of who ported the cylinder head beneath it.

I personally feel these springs are overkill for most street cars... a 918 or 978 comp would suffice IMO

I just wanted to make aware the potential interference issues, as this paricular engine needed quite a bit removed to clear.

CAT3

iTrader: (9)

Good news they can be dremeled...ummm more fun Drew778!

VSGLS1

iTrader: (8)

I am pulling my valve covers probably Sat when the engine is nice and cold. Hope this is what is eating my HP.

bill99hawk

Dang that sounds like a potential problem Whistler. BTW, did you get the car started today? I'm curious as to how the day ended at the shop. Either way take your time with the car, maybe tomorrow, may next week I'll get it back. It was sweet to see the car almost completely back together. Top five things to do with the car is get it tuned sometime soon, probably next week. Well, I didn't make it to the back up to the shop after I left. When I got home I dropped from sleep withdraw. I plan to on going up to the shop tomorrow afternoon around 3:00pm to chitchat about things. Are you going to be there? I will talk to you later.

Camaroholic

iTrader: (1)

This has been common since well before the LS1. I ditched my never used GMPP LT4 Hotcam rockers because they wouldn't clear my Crane 99893 springs on my LT1 heads. CompCams HiTech Stainless rockers had no problem with them. But then the stock valve covers don't work with those wider CompCams rockers... and the cycle continues.

-Andrew

JaSSon

iTrader: (11)

Are there any clearance issues with Yella Terras?

gomer

iTrader: (13)

I had a "slight" clearance problem with my stock rockers... when I went to Yella terras there was NO CLEARANCE PROBLEM WHAT SO EVER. That is the main reason I got the terra rockers, I wanted to run the big springs that Terry offers and have a set of rocker arms that would fit with them good.... btw.. I ran the living hell out of my car for 8,000 miles with the "modified" factory rockers without a single problem.

Hannibal

By taking the dremel to the rockers slightly to knotch them - will that create a weak section on the rocker which could lead to it breaking or is the "touching up" so minor that it would have no effect really on strength.

I want to be safe but i REALLY dont want to go drop ANOTHER unexpected $500 on Yella Terra's that would ensure proper clearance.

Anyone?