Comp 1.52 rockers?
Thread Starter
Safety Car
Joined: Apr 2002
Posts: 3,551
Likes: 0
From: No link, No dupe
Comp 1.52 rockers?
Just wanted to get a few opinions here. Currently, I have stock rockers, and want to upgrade. My two paths are roller-tip or full roller.
I like the full rollers, but I don't want to change valve covers.
The roller tips generally are a waste of money, but my thinking is that the 1.52 ratio would actually make a little more power than my stockers. Maybe, just maybe, the roller tip would provide longer life.
Using 1.52 rockers, would I need to use different pushrods? Currently, I am using Crane Guideplates and energizer pushrods.
Comments or suggestions?
Thanks! :seeya
[Modified by shotgun_000, 8:30 AM 2/26/2003]
I like the full rollers, but I don't want to change valve covers.
The roller tips generally are a waste of money, but my thinking is that the 1.52 ratio would actually make a little more power than my stockers. Maybe, just maybe, the roller tip would provide longer life.
Using 1.52 rockers, would I need to use different pushrods? Currently, I am using Crane Guideplates and energizer pushrods.
Comments or suggestions?
Thanks! :seeya
[Modified by shotgun_000, 8:30 AM 2/26/2003]
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Re: Comp 1.52 rockers? (shotgun_000)
With the cam you have the roller tips are all you need. Full rollers sounds cool but save your money for other things. The 1.52 is a true ratio. The stockers are more like 1.48. So you will get a little more lift. Full rollers are not needed until open pressure starts to exceed 300 pounds. The Comp Cams roller tips fit under my covers with a thick valve cover gasket.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Re: Comp 1.52 rockers? (shotgun_000)
Stock measure about 1.48 so 1.52 is a ratio increase. Helps valve guide life. You don't need full rollers for your setup. Have posted many times that full rollers are needed for over about 6500 rpm &/or when valve spring pressures are over 350 lbs.
:cool:
:cool:
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Comp 1.52 rockers? (shotgun_000)
I got the roller tip 1.52's. Seem to be holding up good. They came with the stock style crimped rocker nuts which began to back off and cause a valve tap. I then ordered a set of Crane cool nuts which are the polylock style. They have a sorta rim around the top near the nut portion. The thicker design of the Comp Cams roller tips caused a clearence issue with these Crane cool nuts. I sent them back and got a set of Mr. gasket Polylocks and they fit good with the roller tips. So avoid the combo of Crane coolnuts/CompCams roller tips. Each in its own it a good part but they wouldnt work togeather for me. The Mr. Gasket polylocks did not have the extra rim and worked in conjunction with CC rollertips. :cheers:
Le Mans Master
Joined: Apr 2000
Posts: 5,202
Likes: 10
From: cincinnati ohio
St. Jude Donor '09
Re: Comp 1.52 rockers? (shotgun_000)
I have Comp roller tips with their 280 magnum cam and springs, the last time I had it apart I could detect absolutely no wear on the valve stems. I am convinced the roller tips also save the guides :cheers:
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Melting Slicks
Joined: Jun 2002
Posts: 2,843
Likes: 99
From: Orrtanna Pa.
Re: Comp 1.52 rockers? (yellow 72)
If you're spending the money for a performance upgrade go to the 1.60 ratio rockers. The difference between the 1.52's and stock would be like the taste of milkj that comes out of a paper carton,verses milk out of a plastic carton.Some folk's claim they can tell,I can't.
Safety Car
Joined: Feb 2000
Posts: 4,977
Likes: 38
From: Massachusetts , USA,
Re: Comp 1.52 rockers? (shotgun_000)
Shotgun.....stock length ok, as your engine has adjustable valvetrain. but if you are going with the Comp Cams roller tiped rockers, I would buy new pushrods....also 1.52 is correct small block ratio & comp cams roller rockers are exact.....The stock, original factory rockers can vary from 1.46 to 1.52 , due to manufacturing & stamping tolerances .......I put the Comp Cams roller tipped rockers on my 427.......3 or 4 years ago..... a magazine dyno test reflected 7 or 8 hp increase with roller tipped rockers :thumbs: note the comp cams roller tipped rockers fit under big block stock valve covers & Crane cool nuts will work on a big/block, at least they did for me.
[Modified by StrayDog, 8:18 AM 2/27/2003]
[Modified by StrayDog, 8:20 AM 2/27/2003]
[Modified by StrayDog, 8:21 AM 2/27/2003]
[Modified by StrayDog, 8:18 AM 2/27/2003]
[Modified by StrayDog, 8:20 AM 2/27/2003]
[Modified by StrayDog, 8:21 AM 2/27/2003]
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
Re: Comp 1.52 rockers? (shotgun_000)
Yeah roller tip rockers should free up a little HP. In addition to reducing wear with the rolling motion, it also reduces friction compared to no roller tips. The non roller tips actually slide back and forth a bit across the valve stem tip which causes friction. Roller tips eliminate this friction.
Thread Starter
Safety Car
Joined: Apr 2002
Posts: 3,551
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From: No link, No dupe
Re: Comp 1.52 rockers? (shotgun_000)
Man, the more I think about this, the more undecided I am about what I want to do. :nonod:
I was looking at the price difference between full rollers and roller tips. For the money, the full rollers appear to be a better deal, and they actually benefit the engine more than roller tips.
Plus, many have said that rollers are not needed on my engine, but when you think about it, most of the modifications I have made were not needed. They were done in the quest for better performance. So, I am thinking that I should just buy full rollers, and the taller valve covers. However, I am sticking with the 1.5 ratios. I've ran numerous tests with DD2000, and even as optomistic as it is, it shows very little gain with 1.6 ratio rockers.
So, can anyone tell me a good reason not to install 1.5 full roller rockers? If I buy them, I probably will buy the Crane Energizer set.
Sorry that I keep this topic going; there are much more interesting threads for sure, but I really need some advice before I make this purchase.
Thanks everyone :seeya :cheers:
I was looking at the price difference between full rollers and roller tips. For the money, the full rollers appear to be a better deal, and they actually benefit the engine more than roller tips.
Plus, many have said that rollers are not needed on my engine, but when you think about it, most of the modifications I have made were not needed. They were done in the quest for better performance. So, I am thinking that I should just buy full rollers, and the taller valve covers. However, I am sticking with the 1.5 ratios. I've ran numerous tests with DD2000, and even as optomistic as it is, it shows very little gain with 1.6 ratio rockers.
So, can anyone tell me a good reason not to install 1.5 full roller rockers? If I buy them, I probably will buy the Crane Energizer set.
Sorry that I keep this topic going; there are much more interesting threads for sure, but I really need some advice before I make this purchase.
Thanks everyone :seeya :cheers:
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Re: Comp 1.52 rockers? (shotgun_000)
The issue is that you will not gain power w/ same ratio & you can easily put roller tip under stock valve covers for a sleeper look. Better to spend money for more power.
:cool:
:cool:
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Re: Comp 1.52 rockers? (shotgun_000)
years ago i had nearly the exact same motor and cam setup as you. I went with the CC 1.6 roller tips. DD2000 fails to reward addition cam lift by very much unless you plug in the custom head flow file numbers for CFM at the .100 lift mark increments.
In the real world your adding about 2 degress to the cams duration at .050. So to really see the change you need to input the .050 cam event numbers from your cam card and then add a degree to each number for intake and exhaust.
In the real world your adding about 2 degress to the cams duration at .050. So to really see the change you need to input the .050 cam event numbers from your cam card and then add a degree to each number for intake and exhaust.
Race Director
Joined: Dec 1999
Posts: 19,610
Likes: 778
From: Forked River NJ
Re: Comp 1.52 rockers? (gkull)
Jvette73, I had the same issue with the rim hitting the rocker arm. Chucked them in a lathe and removed the lip. End of problem. The Crane nuts have been working fine ever since.
