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Old 10-12-2010, 12:28 AM
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I need help selecting another rocker arm

I am looking to replace my alum. procomp 1.5 full roller rockers 3/8 stud(pc2301). I was wondering if you could offer any suggestions. I am trying to work within the following guidelines:

I want the ratio to remain 1.5

I would like to try to avoid aluminum

I would like to try to spend under $250

I am not concerned if they are full roller or not

I am most concerned with reliablity and durablity


My set up is as follows SBC 355:
Comp hyd roller xr276 cam 224/230 .502/.510
valve springs comp cam 924 1.509" OD
http://www.summitracing.com/parts/CCA-924-16/
Comp cam guide plates

Engine makes about 400hp/420tq and will be entirely street driven for cruises and shows it will see no track time.

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Old 10-12-2010, 12:43 AM
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I run roller tip rocker arms that Day Motorsports sells, in my imca stock car engine. three seasons on them, about 50-60 nights, prolly 2000 laps+ at 6800+ rpm, and not a SINGLE failure.

their part number is-PRW-835004 for 1.6 ratio, 1.5 ratio is PRW-835001

list price is $99.99.
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Old 10-12-2010, 12:48 AM
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Aluminum is not a problem if you get good ones. Scorpion is US made, very nice lke jewelry, and guaranteed for life, .800" lift and 1000 lbs spring load. Good prices for them at www.competitionproducts.com Good folks with good prices, I've dealt with them many times.

Part # S153 fits your requirements, $216.
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Old 10-12-2010, 02:38 AM
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Harland sharps
$230.00
best bang for the buck!!!
heres the link
http://www.summitracing.com/parts/CSP-S1001/
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Old 10-12-2010, 09:44 AM
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I don't think the Harland Sharps will work my spring diameter is 1.509.

I have read some good things about the scorpions but I am concerned with the strength of the aluminum rocker in a street engine. The things that I read about aluminum basically said that no matter how good the aluminum alloy is it will eventually fail and 30K miles is a lot to get out of an aluminum rocker. I like the lifetime warranty

The PRW S/S rockers look good to me I like the fact that they are steel but I am concerned about the quality control b/c they are apparently made over seas. I was surprised to see these also have a lifetime warranty ( at least the full rollers do).

When searching online for failures I found failures on all the rockers , but I guess that can be expected for parts used in high HP applications. I do think that any of these will be a few steps up from the Procomp currently installed, but I am still undecided. I just want to make sure that whatever I pick is relatively maintenance free, durable and reliable, I don't want to get stranded b/c of a broken rocker.
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Old 10-12-2010, 10:08 AM
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What is the installed height of those springs?

In any event, I have put many thousands of miles on HS rockers, have also done the same w/Comp Hi-Tech stainless steel rockers ($412), w/o any issues whatsoever.
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Old 10-12-2010, 10:13 AM
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According to the engine builder it is 1.900 , however I have not double checked this. I do think that 1.900 is most likely correct though, b/c he used valves that were .100" longer.
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Old 10-12-2010, 10:16 AM
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Only reason I ask, is the pressure gets too high at 1.7" installed (>180 pounds on the seat), 1.8 would still be high-ish (almost 150 pounds on the seat).

Last edited by cobalt327; 10-12-2010 at 10:45 AM.
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Old 10-12-2010, 10:31 AM
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Comp Cams 1601-16. The last rocker you will have to buy. I have put hundreds of these in and only had a couple failures after many laps of racing that were not the result of the spring/valve/pushrod gnawing on the rocker body.
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Old 10-12-2010, 05:08 PM
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Quote:
Originally Posted by lmsport
Comp Cams 1601-16. The last rocker you will have to buy. I have put hundreds of these in and only had a couple failures after many laps of racing that were not the result of the spring/valve/pushrod gnawing on the rocker body.
I noticed that these are 1.52 ratio, if I were to go with these and spend the extra $$$ would they be a direct bolt in or would I have to change other parts to make them work. The heads I have now have 1.5 rockers on them.
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Old 10-12-2010, 05:24 PM
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Quote:
Originally Posted by THETANK
I noticed that these are 1.52 ratio, if I were to go with these and spend the extra $$$ would they be a direct bolt in or would I have to change other parts to make them work. The heads I have now have 1.5 rockers on them.
Direct bolt-in, the .02 ratio difference only adds about .005" lift, nothing to worry about.
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Old 10-12-2010, 05:37 PM
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Quote:
Originally Posted by BigRoy1978
I run roller tip rocker arms that Day Motorsports sells, in my imca stock car engine. three seasons on them, about 50-60 nights, prolly 2000 laps+ at 6800+ rpm, and not a SINGLE failure.

their part number is-PRW-835004 for 1.6 ratio, 1.5 ratio is PRW-835001

list price is $99.99.
From what I understand by reading in other posts there is no benefit at all to a roller tip rocker arm because the roller tip just skids across the valve at high speeds and it has been determined by high speed cameras, if I remember right Old Bogie said that. The benefit to a true roller rocker arm is only in the fulcrum, correct me if I am wrong though
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Old 10-12-2010, 06:31 PM
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The roller tip is necessary for use with higher lift cams. While the roller might just slide on the valve stem, it is not capable of producing radial load of much magnitude.
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Old 10-12-2010, 06:40 PM
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Quote:
Originally Posted by THETANK
I don't think the Harland Sharps will work my spring diameter is 1.509.

I have read some good things about the scorpions but I am concerned with the strength of the aluminum rocker in a street engine. The things that I read about aluminum basically said that no matter how good the aluminum alloy is it will eventually fail and 30K miles is a lot to get out of an aluminum rocker. I like the lifetime warranty

The PRW S/S rockers look good to me I like the fact that they are steel but I am concerned about the quality control b/c they are apparently made over seas. I was surprised to see these also have a lifetime warranty ( at least the full rollers do).

When searching online for failures I found failures on all the rockers , but I guess that can be expected for parts used in high HP applications. I do think that any of these will be a few steps up from the Procomp currently installed, but I am still undecided. I just want to make sure that whatever I pick is relatively maintenance free, durable and reliable, I don't want to get stranded b/c of a broken rocker.
I am using the PRW stainless full roller on my 406 sbc and are very happy so far. Only been running them for about 6 months though. They appear to be well made to the naked eye and my dad " the machinist " couldn't find anything to gripe about . A quick wash and oil bath and on they went. I paid $180.00 - I would have gone with the comps but ran out of $$ .

http://www.kmjent.com/cart/product.p...0164565&page=1
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Old 10-12-2010, 06:48 PM
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I am running Harland Sharp on my T/A really pleased with these. I am running Pro-form ( junk IMHO ) But you get what you pay for so those are leaving and i am going with HS or scorpions even thought about a set of those comp gold.



Cole
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