Hi, as the title says, I was wondering what the benefits are from shaft mounted roller rockers over my comp cam pro mag self aligning 1.6 RR's.

thanks for the advice

 

The shaft mounted rockers are more stable. The studs that hold the individual rockers can bend under heavy loading.

 

the con : the ginourmous hole they leave in your wallet

 

And the fact that they do next to nothing inless you have a whicked all motor solid roller set up that consistantly see's 7000+ RPM's. If your concerned with it, even on a NASTY street car, add a stud girdle, and call it a day.

Inless you have the money, then I say go for it, post pics, and keep us updated. It will be more stable. It will cost a fortune. For 99% of the LT1's being built out there, it will have little to no effect on performance and should be spent elsewhere.

 

My race car has a BBC with a fairly radical SR cam that regularly sees 7,5000rpm with high quality screw-in rockers and a stud girdle, no problems. I wouldn't even think about shaft mounts for a street or street strip car. As was said, it better be wicked before you need shaft mounts.

Rich

 

Here is a recent thread with some good info and experiences on shaft mounts:
http://web.camaross.com/forums/showthread.php?t=523331


Nick

 

I've read that the shaft mounted rockers can provide as-much-as 30 HP increase over the stud mounted RRs (everything else being the same). And that was probably with a high lift cam where stud flex (valve train instability) was an issue with the RRs.

WD

 

Or a magazine test.

 

Dammit pops I thought you were gonna give the low down on shaft mounts, since your the most qualified to talk about that here!

Two biggies though.... stiffness and better geometry which reduces friction.

Bret

 

When did this become a soft-**** site?

 

I think that shaft mounts are like belt drives for the cam. All kinds of theoretical advantages ("elimination of valve train harmonics", etc.) but when put to the test - no hp increase. I would only use them on a very radical, high rpm, high spring pressure application.

I'd be willing to do back to back on both the Camaro and the race car if someone would care to donate the rockers .

Rich

 

Thanks for all the info guys. I guess my main problem is I am still using the stock 3/8" studs and have had small issues here and there. One of my roller rockers seems to almost hit the head of the stud every now and then when adjusting them (while running) so it has some very small marks on the underside of it. I was just thinking about replacing the studs, and thought of replacing to shaft mount rockers. My cam isn't the meanest now, but my roller rockers seem to be getting somewhat old. I guess new ARP Studs is where I should go from here?

 

Upgrade to good 7/16" studs and that should do it for you.

Rich

 

will the 7/16" studs work with my roller rockers? You are talking about the diameter of the threads right? I remember getting the stock size RR's so that is why I ask. Thought they were 3/8" stock diameter.

 

Shaft mounted and SA rockers???