63mako

If you have ever seen the havoc created when an inexpensive roller rocker decides to self destruct and run shrapnel through your new motor you wouldn't think twice about spending a hundred or two extra to buy the good ones. I seen a pro comp shaft system fail and take out a $10,000 motor. Guy thought he was pretty smart because he saved $400 over the Jesel setup.

gkull

The best stud mounted RR is made out of stainless steel, uses 7/16th studs, has the biggest diameter spring clearance, and has allen locking nuts.

You can't use short valve covers on gen 1 performance motors because you need taller studs and .100 or .200 longer valve stems for springs with installed heights of around 2.0 inches.

An often over looked part is valve stem lash caps......... I recommend them. They give addition rocker arm to spring retainer clearance and save the valve stem tips in the event of the lash becoming too great. Bigger surface for the roller tip to run on. They are cheap compared to the valves.

IMO the Crane gold stud girdles are the best made. They keep the studs from deflecting on even valve cycle and they clamp to the allen locking nut body so they can't rotate. Your valve adjustment doesn't change

pauldana

I had the comp cams ultra pro magnum SS on my 383 and loved them... I got talked out of them for my 427 build... The reason was given was valve train resonance .... Had a hard time solllowing that but I just went with it do do the sourse...

Ended up with Crain ultra gold I think

jimvette999

My Crower shaft rollers have been trouble free.
SBC Small Runner, Victor Jr Stainless Steel Shaft Mount Rockers

DannyBlake10

I'll definitely go with the bigger stud
Im going to end up with the crower Stainless Steels or the Comp Ultra Pro Mag

George, now you got me interested in these caps

Gale Banks 80'

In my last Engine I had the Crower SS Rockers from the mid 1980's. When the Engine was idling the Engine builder commented on how quite the Valve train sounded. It didn't sound anything out of the ordinary to me. On my new Engine Comp Cam Steel Rockers were used and now I have a noticeable increase in valve train noise enough to where you can here them when the T-Tops are off wile driving. My Engine builder sez that that's normal compared to the Crower's. Makes no sense to me. My last Engine had stamped steel Valve Covers, new one Sheet Aluminum. I have always wondered why the New Cars are coming with ugly Plastic sound barriers over the Engine, I am starting to understand why. If my new Engine needs to come apart for some reason the Crowers are going back in.

cv67

Back in the 90s I bought a set of Proform roller rockers I didnt know any better. 300 mi later one of them gave up the ghost on the fwy spitting needle bearings everywhere.

Have Jesels now absolutely love em! 0 deflection
Hated paying for them but knew that was about as good as I could get was tired of having parts failures. Good 7/16 stud and rocker probably would have sufficed but had it at the time so-

gkull

Danny we had lunch when I drove down for the lunch on the corvette get together.

Lash caps come in various thicknesses. Like ,080 .060 and ,040 I have used the comp cams ones with my 10 degree retainer keepers.

I never thought about them until I had 1.56 diameter springs and my Comp cams 1.65/ 1.7 ratio steel RR's were hitting my retainers

DannyBlake10

yes I remember that
ok, how do I know the size I need?
I've already got my springs, locks and keepers. all titanium from PAC
don't remember the exact size off the top of my head. they're at home


and I just realized, there are no studs in this engine. don't know why I didn't remember this before
the trunion sits in a seat and a bolt goes through it, directly into the head. in order to run a larger bolt with this id have to pull the heads and have them re-drilled and tapped

gkull

You have to know your valve stem diameter. The head manufacturer has that online. I've always used the CC or manley , 040 and .060

MotorHead

What heads do you have ? Sounds like they were intended for shaft rockers. I have T&D aluminum shaft rockers and they are definitely the catz azz. Once you go to shaft rockers you will never go back. I haven't adjusted them for 3 years now with a solid roller cam.

Paul you have a couple of disadvantages. His heads are 15deg ? And his drive-train loss is about 12-13% in C5 and up. Very hard to compete with 23 deg heads and a 23% drivetrain loss, his engine can make less power and still come out on top on chassis dyno. No way would I try and compete unless I went to different valve angle head.

pauldana

hahahahah:-) he is not allowed to beet the C3!!!

Silver 7T8

HOW ABOUT THESE ? THEY ARE IN THE C3 PARTS FOR SALE SECTION:

NEW-in-BOX Comp Cams #-1602-16 ULTRA-PRO MAGNUM ROCKER ARMS.
Only $250 & Shipped FREE ! ! !

Chevrolet Small Block Fitment.
3/8" Rocker Arm STUD Size (This is the Standard Small Block Chevrolet Size)
LARGER 1.6 Rocker Arm RATIO (Standard Small Block Chevrolet is RATIO 1.5)

Two rocker arms were removed from box to 'Photograph" thus 14-are still plastic wrapped!
ALL 16 of These ROCKER-ARMS are BRAND NEW & NEVER Installed.
Summit-Racing has them listed at $315.oo - - -
YOURS for ONLY $250 ! And SHIPPED FREE !

DucatiDon

I didn't see those or I'd be all over them myself.....link?

Silver 7T8

DucatiDon, I just "POPED" the listing for the Comp ULTRA Rockers to the top of the C3 Parts for Sale/Wanted SECTION.

Thank You
Larry - Silver 7T8

DannyBlake10

the heads are ls6 heads with a lingenfelter world challange porting profile
id change them over to stud mount if thats the best route.
at what point in rpm or cam ramp up do you start seeing a difference in shaft mount rockers and at what point do they become necessary.

George my valve stems are 8mm
4.86" intake and 4.915" exhaust

gkull

Call summit or who ever and get your 8mm .040 or .060 I have not justified the shaft rocker deal. I use off set lifters, 7/16th arp studs and Crane gold stud girdle

Shaft rockers like my local company sell offset shaft rockers,


http://www.tdmach.com/

MotorHead

That is true, I never said he would beat you, just said it was easier for him to make good RWHP numbers with a less powerful engine of course he won't beat a C3

MotorHead

About 6000RPM and up I would use them especially with a high lift roller cam. Lots of guys running stud mount at these levels, it just comes down to cost.
However I feel they are worth every cent. They make the whole valve train more stable and you can get offsets so your pushrods are completely vertical and in line with the valve