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Old 04-18-2013, 05:51 PM
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Roller Rocker recommendations

I'm wanting to get some roller rockers for the Built 350 SBC. I'm running a Lunati Hydraulic flat tappet cam, 300 duration, .515 lift.

Here is the cam I'm running
http://www.summitracing.com/parts/lu...make/chevrolet

Should I get 1.5 or 1.6 ratio? Also, I'll have to measure the stud size, to see which one of those I need as well, right?

I was looking at these
White Performance Detail Description

Thanks guys.

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Old 04-18-2013, 06:20 PM
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Get the Summit/Scorpion roller rockers. 1.5:1 is plenty.

That cam needs a 3500+++stall and gears. it likes rpm.
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Old 04-18-2013, 06:24 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
Get the Summit/Scorpion roller rockers. 1.5:1 is plenty.

That cam needs a 3500+++stall and gears. it likes rpm.
Yeah, I got the stall and gears.

Would you mind linking me to those roller rockers you are talking about?

Thanks for the help.
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Old 04-18-2013, 06:39 PM
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Also, do you suggest roller tip or full roller?
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Old 04-18-2013, 06:43 PM
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1.6 r is a crutch for the wrong cam..
figure out what you need for a cam and start off with the correct one..
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Old 04-18-2013, 06:46 PM
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Originally Posted by gearheadslife View Post
1.6 r is a crutch for the wrong cam..
figure out what you need for a cam and start off with the correct one..
Yeah, FBIRD said 1.5 would be fine for my cam.
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Old 04-18-2013, 10:22 PM
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Quote:
Originally Posted by fastnloud View Post
Should I get 1.5 or 1.6 ratio?
1.5 will work fine.

Quote:
Originally Posted by fastnloud View Post
Also, I'll have to measure the stud size, to see which one of those I need as well, right?
Small block Chevies come stock with 3/8" diameter rocker studs.

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Originally Posted by fastnloud View Post
Would you mind linking me to those roller rockers you are talking about?
Here's the standard 1.5 ratio, 3/8" stud Scorpion full roller rocker....
http://www.summitracing.com/parts/sc...make/chevrolet

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Originally Posted by fastnloud View Post
Also, do you suggest roller tip or full roller?
Those sliding trunnion, roller tip rockers that Comp makes are, in my opinion, the worst piece of mechanical engineering crap that has ever been foisted on the hot rodding public. I've seen example after example of the trunnion housing turning blue from the heat generated by the sliding action of the ball against the housing. In my opinion, the only thing they have going for them is a consistent rocker ratio. Further, in my opinion, the braintrust who put this idea over to management at Comp should be tied to a pole and caned.

When cam grinder Racer Brown was still alive, the roller tip rockers had just come out. He mounted them up and did some very high speed photography and found out that the roller tips were too small to make a mechanical couple with the valve stem tip and that they just skidded across the tip. He reasoned that the roller would have to be much larger to work as the designers intended. My personal take on the whole mess is that a roller trunnion, conventional tip would be the best of both worlds, just bass ackwards from what Comp has marketed. If you study how the stamped rocker tip interacts with the valve stem tip, it's just like the sole of your shoe as you take a step. The front half of your shoe holds you up against the pavement as it rolls through an arc. Same exact way a rocker arm works. There is no friction if the whole thing is set up correctly. The stamped rocker tip rolls over the valve stem tip. Think about it.

Now, having said all that, I personally think that the roller trunnion, roller tip rockers are a giant leap forward over stamped, sliding ball rockers. Further, I consider Scorpion to be a manufacturer of high integrity and I would buy their products tomorrow if I had the application to use them.

Last edited by techinspector1; 04-18-2013 at 10:38 PM.
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Old 04-18-2013, 10:35 PM
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Not sure who makes Skips rr's but last week at a buddies shop we went through 2 sets, first set sent had a noticeable "crunch" at the trunion on 2, the replacement set had 3 the same, ended up going with Harland Sharps which I have used and abused on several cars and never had an issue, very smooth, and if bi remember correctly rebuildable and cheaper then summits.
http://www.summitracing.com/parts/csp-s1001/overview/
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Old 04-18-2013, 11:11 PM
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Thanks guys. I was thinking I might go with this set, I wonder which company makes these for Summit?
http://www.summitracing.com/parts/cm...make/chevrolet
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Old 04-18-2013, 11:12 PM
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Sum-G6905 look it up yourself.
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Old 04-18-2013, 11:17 PM
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Quote:
Originally Posted by F-BIRD'88 View Post
Sum-G6905 look it up yourself.
About $20 price difference from the other Summit brand ones I was looking at, these have a bit higher slot width and max spring diameter. Should I go with these for the extra $20?
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Old 04-18-2013, 11:24 PM
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Quote:
Originally Posted by fastnloud View Post
About $20 price difference from the other Summit brand ones I was looking at, these have a bit higher slot width and max spring diameter. Should I go with these for the extra $20?
The ones you highlighted are pro form......dont do that.......might as well by skip whites at that point.
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Old 04-18-2013, 11:27 PM
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Quote:
Originally Posted by bygddy View Post
The ones you highlighted are pro form......dont do that.......might as well by skip whites at that point.
Alright, yeah I might just go with these that FBIRD mentioned.
http://www.summitracing.com/parts/sum-g6905
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Old 04-19-2013, 06:22 PM
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I'm going to get the Scorpion roller rockers.

Now could someone recommend me some valve springs for my cam (hydraulic flat tappet .515 lift)? I'm not sure what valve springs are in my truck, so I thought I might get some new ones while I'm getting the rockers.
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Old 04-19-2013, 06:38 PM
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I run Harland Sharp on my chevelle. I had a set on my 582 in the dragster, it had over 800 lift and went 4.50's in the 1/8, and I never had a problem. We took a set of Scorpian's off a dirt track SB that had a 1/2 season on it and there were several that had bearing problems. That is the only experience I had with them, but the guy that does my machine work said to stay away from them. Yrs ago I blowed a eng and it broke 4 HS rockers. I called them and they had me send them in. They sent me 4 new ones even after me telling them what happened.
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