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post #1 of 18 (permalink) Old Dec 15th, 07, 03:25 PM Thread Starter
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Doug
 
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Roller rockers

Was thinking about installing a set while doing my current project. Do you think it's worth the money? I was looking at the proform set http://store.summitracing.com/partde...4&autoview=sku Do i need narrow body rockers with centerbolt valve covers? I know they need to be self aligning. Sorry, i am used to building older sbc's. Thanks
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post #2 of 18 (permalink) Old Dec 15th, 07, 04:03 PM
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Re: Roller rockers

What heads do you have and what are the valve covers, Doug?

Duh. read your sig. Now it depends on the valve covers. I went with 8 1.6 roller tipped and 8 1.5 on the exhaust. I noticed when I had 1.6's all the way around the powerband was up in the RPM range. When I split them, 8 INT 8 EXH, It was MUCH Better. I think you will like them. They are true 1.5 rockers. not like the stock ones stamped around 1.46

what valve covers?

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post #3 of 18 (permalink) Old Dec 15th, 07, 04:14 PM Thread Starter
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Re: Roller rockers

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Originally Posted by wiskeesour View Post
What heads do you have and what are the valve covers, Doug?

Duh. read your sig. Now it depends on the valve covers. I went with 8 1.6 roller tipped and 8 1.5 on the exhaust. I noticed when I had 1.6's all the way around the powerband was up in the RPM range. When I split them, 8 INT 8 EXH, It was MUCH Better. I think you will like them. They are true 1.5 rockers. not like the stock ones stamped around 1.46

what valve covers?
Hey Harley. How have you been? These are my covers http://store.summitracing.com/partde...5&autoview=sku

I was thinking about the comp pro magnums but they are very expensive and unsure they will work with centerbolt covers? Thats why i was looking at the proforms.
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post #4 of 18 (permalink) Old Dec 15th, 07, 04:19 PM
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Re: Roller rockers

If you can go with a 7/16 stud .
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post #5 of 18 (permalink) Old Dec 15th, 07, 05:51 PM
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Re: Roller rockers

Doug:

I’m in a similar position as you with your SBC built up. I run Pro Magnums on a BBC but I don't believe Rollers are really that great of an advantage unless you run a Girdle and that of course would require Tall Valve covers thus eliminating Stock Height covers. I've a L79 basket wrapped waiting assembly. I do like the looks of the OEM LT1 Aluminum Covers on a Small Block and have been thinking Shaft Mounted Roller Rockers which will fit under these covers; however, Jessel's are to say the least very expensive. I've looked at the Chinese Item made by CAT part # RKM.350A that supports various Rocker Ratios and sell for considerably less.

I know they are not North American made but considering price they may be an answer and then I question Quality. I have a set of these CAT RKM.350A Shaft mounted Roller Rockers and they do look well built.

I wonder if anyone here experience with the CAT RKM.350A SBC Shaft Roller Rockers.

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post #6 of 18 (permalink) Old Dec 15th, 07, 06:11 PM
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Re: Roller rockers

If you have after market heads with the taller oil rail, you might get away with using Pro Magnums and the LT1 covers. They cleared on mine . When I saw the heat blueing in the ball pivot Magnums, I decided it was time to get away from that friction point and go to roller trunions.

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post #7 of 18 (permalink) Old Dec 15th, 07, 06:14 PM Thread Starter
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Re: Roller rockers

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Originally Posted by zdld17 View Post
If you have after market heads with the taller oil rail, you might get away with using Pro Magnums and the LT1 covers. They cleared on mine . When I saw the heat blueing in the ball pivot Magnums, I decided it was time to get away from that friction point and go to roller trunions.
Thanks Don. The fast burn heads do have the raised rail. My centerbolt valve covers are the tall version. Are you using pro magnums on your car and if you are what valve covers do you have? Thanks
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post #8 of 18 (permalink) Old Dec 15th, 07, 06:16 PM
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Re: Roller rockers

zdlt17:

You're right I believe the Pro Mag Rockers did it under my Stock Height BBC Valve covers but then again if you are going to put that kind of money out you might as well take full advantage and run a Stud Girdle in which case you require taller covers.

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post #9 of 18 (permalink) Old Dec 15th, 07, 07:00 PM
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Re: Roller rockers

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Originally Posted by Dougs67camaro View Post
Thanks Don. The fast burn heads do have the raised rail. My centerbolt valve covers are the tall version. Are you using pro magnums on your car and if you are what valve covers do you have? Thanks
Now I just went thru this. ANY Narrow rockers will fit inder center bolt valve covers. Thats why there narrow. Saw it with my own two eyes. Proform are EXACTLY like Harland Sharp...compared with my own two eyes.
Roller tip rockers brought down my oil temp 17* at operating temp. Lower heat= power. I had a temp unit where my oil pressure should have been. I knew I had pressure, wanted to see what all the roller tips did for me.

Ive been good Doug! How bout you and yours?

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post #10 of 18 (permalink) Old Dec 15th, 07, 07:05 PM
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Re: Roller rockers

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Originally Posted by Dougs67camaro View Post
Thanks Don. The fast burn heads do have the raised rail. My centerbolt valve covers are the tall version. Are you using pro magnums on your car and if you are what valve covers do you have? Thanks
I am using the my old stock lt1 covers on the AFR heads with promagnums.

Don
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post #11 of 18 (permalink) Old Dec 15th, 07, 07:37 PM Thread Starter
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Re: Roller rockers

Thanks Don.
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post #12 of 18 (permalink) Old Dec 15th, 07, 08:03 PM
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Re: Roller rockers

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Originally Posted by Z15CAM View Post
Doug:

I don't believe Rollers are really that great of an advantage unless you run a Girdle

Rollers reduce friction and mass over ball and socket. Stud Girdles reduce rocker pivot-point wiggle. And yes a Jesel shaft system is expensive, I have a set. I also have 2 sets of rollers with no stud girdle.


Reducing friction and weight lets the engine rev faster.

Reducing flex improves the accuracy of the valve train by attempting to strengthen a design weakpoint.

A girdle would augment either style of stem based rocker, OEM or roller. The benefits of a roller rocker would be fully realized without a girdle, less friction/weight.

Then you figger...300 for rollers and 100 for a girdle... and you're still rockin on a soda-straw tied to more of the same..... **** it...700 and a Jesel system and you can see your stuff when you yank the cover instead of a bandaid contraption.

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post #13 of 18 (permalink) Old Dec 15th, 07, 08:19 PM Thread Starter
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Re: Roller rockers

Shaft rockers are way out of my price range. Besides, i don't think you need shaft rockers or even a stud girdle until you start running a ton of lift with some serious spring pressures. Under 6000 rpm stud mounted rockers without girdles work just fine.
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post #14 of 18 (permalink) Old Dec 15th, 07, 08:44 PM
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Re: Roller rockers

Doug: I tend to agree with Wolf re:" The benefits of a roller rocker would be fully realized without a girdle, less friction/weight." as the SBC's Valve Train is not quit as suseptable to wear compared to a BBC's because the Valve Train is Lighter. Then again as you mention you have to consider the amount of lift involved. As the lift increases higher spring pressures are involved and consequently the longer sweep across the Valve tip create additional wear on the Guides.

To tell you the truth my engines spend most the time between 2000 and 3000rpm driving around in todays traffic and makes me wonder why I even consider running .550 lift SBC or .623 Lift BBC; then you got to consider, we are a sick and sorry lot infected with a passion for pushing the limits - when in fact a .485 SBC and .550 BBC lift would give you all the performance you need with out the worry of self destructing - lol

Think I'll start a new Post and see what opinions I get on them CAT RKM 350A SBC Shaft Roller Rockers as they cost approx $250 - I've been reading nasty things about the CAT Stud Roller Rockers but seems the Shaft ones are OK.

Here's an interesting $159 Stainless Steel Roller Rocker by PRW that fit Center Bolt Covers on eBay:

http://cgi.ebay.com/ebaymotors/Chevy...QQcmdZViewItem

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Last edited by Z15CAM; Dec 15th, 07 at 10:40 PM.
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post #15 of 18 (permalink) Old Dec 16th, 07, 05:01 AM
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Re: Roller rockers

While on the subject, I saw these at Sema, anybody used them? Made in USA.

http://www.scorpionperformance.com/n...?category_id=1

Don
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