Roller rocker comparison
Racer
Joined: Apr 2016
Posts: 493
Likes: 65
I'd put a torque converter in now, as it goes back together....
Le Mans Master
Joined: Jul 1999
Posts: 5,005
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From: jackson nj
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
I might need something better than them then. With the cam I'm putting in which is the comp cam XE268H, comp cam recommend to upgrade to these valve springs.
http://www.compperformancegroupstore...ct_Code=981-16
According to the summit listing these have a spring rate of 370 lbs/in. Is spring rate the same as open spring pressure?
I would like to stick with my original valve covers and am happy to use a 5/16 gasket for clearance if I have to. But if they dont fit well I'll have to change the valve covers then.
https://www.summitracing.com/int/par...1-16/overview/
I wonder how much valve spring pressure they tolerate. Are you using these with the standard valve springs and what cam installed please mate? I've used Crane stuff before and had no issues also.
http://www.compperformancegroupstore...ct_Code=981-16
According to the summit listing these have a spring rate of 370 lbs/in. Is spring rate the same as open spring pressure?
I would like to stick with my original valve covers and am happy to use a 5/16 gasket for clearance if I have to. But if they dont fit well I'll have to change the valve covers then.
https://www.summitracing.com/int/par...1-16/overview/
I wonder how much valve spring pressure they tolerate. Are you using these with the standard valve springs and what cam installed please mate? I've used Crane stuff before and had no issues also.
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
The car is together, its a running car. Doesn't look like it will be getting any work done soon as the mechanic is way too busy over Christmas.
Awesome mate, I love Hi Stalls.
The 981-16 spring really is not much of a spring upgrade over stock. It is a better spring but not much more pressure. Stock rocker arms will handle that spring with no problem. I have used the comp roller tip on much bigger springs than those so you should be fine with any rocker arm. Once you get into solid roller cams with big springs, diameter and pressure do you really need to be running really good rocker arms.
Last edited by Corvetteoz; Dec 4, 2016 at 04:40 PM.
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
Its my understanding that if I fit roller rockers that require screw in studs, that the original heads will need to be drilled out to take screw in studs anyway. If the heads require removal I might as well go with the 1.6 ratio then.
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Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Roller rockers WILL provide more power.....largely because stock stamped steel rockers are not really 1.52 ratio....(yes 1.52) they may come in at 1.47 or so.....the premium roller tip units will show an increase in power too....
If you have heads with push in studs....stick with the 1.52 ratio.....one, because you do not know how well they are pushed in.....and, two....with 1.6 rockers there is a huge chance that the pushrod will rub the outside of the pushrod slot in the head.....
Jebby
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
A couple of things.....
Roller rockers WILL provide more power.....largely because stock stamped steel rockers are not really 1.52 ratio....(yes 1.52) they may come in at 1.47 or so.....the premium roller tip units will show an increase in power too....
If you have heads with push in studs....stick with the 1.52 ratio.....one, because you do not know how well they are pushed in.....and, two....with 1.6 rockers there is a huge chance that the pushrod will rub the outside of the pushrod slot in the head.....
Jebby
Roller rockers WILL provide more power.....largely because stock stamped steel rockers are not really 1.52 ratio....(yes 1.52) they may come in at 1.47 or so.....the premium roller tip units will show an increase in power too....
If you have heads with push in studs....stick with the 1.52 ratio.....one, because you do not know how well they are pushed in.....and, two....with 1.6 rockers there is a huge chance that the pushrod will rub the outside of the pushrod slot in the head.....
Jebby
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
Ok so we're down to 2 roller rockers. Which one I haven't decided yet.
Comp cams High energy roller rocker 1.5 ratio 3/8 mount. A full roller rocker that's very good value for money at $259 landed here. Obviously will still need guide plates. Rated at 550lbs of open spring pressure.
http://www.ebay.com.au/itm/Comp-Cams...4AAOSwBahVciBI
PRW Aluminium roller rockers 1.5 ratio 3/8 mount self aligning. Also good value at $319 landed here. Rated at 750lbs of open spring pressure.
http://www.ebay.com.au/itm/162134666...%3AMEBIDX%3AIT
These Elgin stainless steel rocker arms looked ok also but at $227 landed here I thought the the 2 above were better value for money.
http://www.ebay.com.au/itm/181392459...%3AMEBIDX%3AIT
I just found these and although they are not a name brand they do look quite good. Anyone used these Jegs branded roller rockers before?
http://www.jegs.com/i/JEGS/555/20100/10002/-1
Comp cams High energy roller rocker 1.5 ratio 3/8 mount. A full roller rocker that's very good value for money at $259 landed here. Obviously will still need guide plates. Rated at 550lbs of open spring pressure.
http://www.ebay.com.au/itm/Comp-Cams...4AAOSwBahVciBI
PRW Aluminium roller rockers 1.5 ratio 3/8 mount self aligning. Also good value at $319 landed here. Rated at 750lbs of open spring pressure.
http://www.ebay.com.au/itm/162134666...%3AMEBIDX%3AIT
These Elgin stainless steel rocker arms looked ok also but at $227 landed here I thought the the 2 above were better value for money.
http://www.ebay.com.au/itm/181392459...%3AMEBIDX%3AIT
I just found these and although they are not a name brand they do look quite good. Anyone used these Jegs branded roller rockers before?
http://www.jegs.com/i/JEGS/555/20100/10002/-1
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
I have run non-locating rollers without guide plates but do not recommend doing so without a set of premium pushrods.......like Trend products. The rockers are heavier.....and will want to "walk" harder.....this makes the pushrod load on the pushrod slot increase.....
I ran my 66' 327 with pinned press in rocker studs, Crane rollers and Trend pushrods for 5 years and about 4500 miles with zero issue.....no guideplates.
If you find the locating rockers where you are at....run those.
Jebby
I ran my 66' 327 with pinned press in rocker studs, Crane rollers and Trend pushrods for 5 years and about 4500 miles with zero issue.....no guideplates.
If you find the locating rockers where you are at....run those.
Jebby
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
I have run non-locating rollers without guide plates but do not recommend doing so without a set of premium pushrods.......like Trend products. The rockers are heavier.....and will want to "walk" harder.....this makes the pushrod load on the pushrod slot increase.....
I ran my 66' 327 with pinned press in rocker studs, Crane rollers and Trend pushrods for 5 years and about 4500 miles with zero issue.....no guideplates.
If you find the locating rockers where you are at....run those.
Jebby
I ran my 66' 327 with pinned press in rocker studs, Crane rollers and Trend pushrods for 5 years and about 4500 miles with zero issue.....no guideplates.
If you find the locating rockers where you are at....run those.
Jebby
Thread Starter
Racer
Joined: Mar 2016
Posts: 470
Likes: 31
From: Melbourne Victoria
I'm leaning towards the PRW self aligning roller rockers. Rated at 750 lbs open spring pressure, which i'll be no where near, a full roller, aluminium and should handle the press pin stud. I just need the mechanic to acquire the right size pushrods.
http://www.ebay.com.au/itm/162134666...AIT&rmvSB=true
http://www.ebay.com.au/itm/162134666...AIT&rmvSB=true
Last edited by Corvetteoz; Dec 7, 2016 at 06:57 AM.
Safety Car
Joined: Oct 2007
Posts: 3,729
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From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
if you have push in studs, the first thing you should do is replace with screw in.
then add performance parts, once you have hardware that will retain the performance parts.
then add performance parts, once you have hardware that will retain the performance parts.