Can I use 1.8 roller rockers?
#1
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Can I use 1.8 roller rockers?
This is what I have:
ls1 with GM hot cam and 5.3 truck heads cast 706 ( 2005 tahoe)
I want to upgrade my valve train.
I have ls6 spirings, magnum comp chrom moly hardened pushrods and wanting a bang for your buck set of rockers. I want a set of rollers.
Can I use a 1.8 ration over the 1.7? What would you use? and what would be my advantages and dis advantages?
Thanks.
ls1 with GM hot cam and 5.3 truck heads cast 706 ( 2005 tahoe)
I want to upgrade my valve train.
I have ls6 spirings, magnum comp chrom moly hardened pushrods and wanting a bang for your buck set of rockers. I want a set of rollers.
Can I use a 1.8 ration over the 1.7? What would you use? and what would be my advantages and dis advantages?
Thanks.
#2
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Moved from advanced tech section.
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2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
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#8
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Im dumb when It comes to the valve train. Im just taking advice from more experienced gear heads and going with what has worked for them. Lots of reading and learning but I love this kind of stuff. Would a 1.8 rocker make my lift any higher? If so can anyone give me a guesstimation on how much?
#9
Yes, u can use the 1.8 rockers on the gm hotcam. The rocker arms bring lift to 556. However, if you are running ls6 springs you will want to change them out to prevent valve float. Look into comp 918's and titanium retainers.
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certanly.... right now with a .525 lift and a 1.7 ratio you have to divide out to find how big your cam lobe actually is. .525/1.7 = .309. To find out your lift with 1.8 rocker ratios, you would then multiply your raw cam lobe height (.309) by the new ratio (1.8) and you would get .309*1.8 = .556 lift. This also means that with that new lift you can not use the GM ls6 springs. You would need springs with a .600 max lift at least. However if your not going to change your cam, then slp makes a 1.85:1 rocker ratio, making your lift .571. With that duration your cam will feel like a decent sized cam, and not just a small upgrade from a stock ls1 cam. But if your plan on changing to a bigger cam, the higher rocker rations are not recommended.
Last edited by Dragkid1917; 08-26-2007 at 01:50 PM.
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I am wanting to upgrade to roller rockers and I have the options of 1.7 or 1.8 with the set im looking at. I figured for the same price, Why not go ahead and get the 1.8 if my car can handle it. I may invest in some better springs as well.
Thanks guys.
Thanks guys.
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Originally Posted by Dragkid1917
you can go to 1.85 with that cam, did u c my math?
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Umm, actually I dont. It is an ls1 so i dont see why the springs would be different at all, however in any case id highly highly doubt they would be more then .550 max lift. What kindof lift do u plan to run
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Originally Posted by vidal77boxing
Yes, u can use the 1.8 rockers on the gm hotcam. The rocker arms bring lift to 556. However, if you are running ls6 springs you will want to change them out to prevent valve float. Look into comp 918's and titanium retainers.
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Originally Posted by Dragkid1917
Umm, actually I dont. It is an ls1 so i dont see why the springs would be different at all, however in any case id highly highly doubt they would be more then .550 max lift. What kindof lift do u plan to run
Has anyone changed just the rockers on a stock C5? Can you comment on the result? Anyone have a dyno sheet?