| Engine and Transmission Discuss Engine, Transmission, and all other performance modifications here. |
10-30-2006, 05:19 PM
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#1
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Rockers?
well i am going to do the LT1 cam swap on my 305, will 1.6 rockers help at all? will they fit? how do they improve power?
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95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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10-30-2006, 08:17 PM
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#2
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AF Enthusiast
Join Date: Jul 2005
Location: Orlando, Florida
Posts: 1,364
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Re: Rockers?
yes to all of that
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92 z28 camaro 5.7 TPI
current - slp intake runners and base-BBK 52mm throttle body-MSD 8.5mm wires, blaster coil, and 6AL Box-edelbrock headers-160 degree stat.-hotchkis strut tower brace
waiting in the garage - LQ4, milled heads 317 casting (10.5 to 1), hardened pushrods, ported LS6 oil pump, manley dual spings with titanium retainers, MTI X1 cam, hawks longtube headers
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10-30-2006, 09:10 PM
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#3
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AF Enthusiast
Join Date: Sep 2004
Location: Somewhere, Missouri
Posts: 3,663
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Re: Rockers?
They improve power by increasing the lift.
Multiply the lift of the cam by the ratio of the rockers you are going to use and that is your new gross lift value.
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10-31-2006, 10:08 AM
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#4
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Re: Rockers?
sweet, i will order them soon.
__________________
95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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10-31-2006, 10:18 AM
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#5
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AF Enthusiast
Join Date: Jun 2005
Location: Salem, Virginia
Posts: 635
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Re: Rockers?
Um, I'm not too sure if the 1.6s will be too much for the stock heads, it's deffinatley pushing it. Whatever cam/rocker ratio you go with don't go over .450" lift with the stock heads or you'll be hurtin'.
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'91 RS, forged LT1, GTP heads, blower cam, AFR Hydra-Rev kit, ram air intake, SLP 1 3/4 headers and 3" y-pipe, 3" Dynomax exaust, Yank 2800 TT stall converter, Strange 3.73 gears with Zexel-Torsen LSD, ect, ect...
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10-31-2006, 10:21 AM
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#6
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Re: Rockers?
damn, i hope it works. I don't want to get new heads on the 305 because it is not worth it. I am just going to do a diffrent intake manifold and TBI and some bolt on's untill i get my 355.
__________________
95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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10-31-2006, 11:33 AM
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#7
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AF Newbie
Join Date: Oct 2006
Location: West Central, Minnesota
Posts: 98
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Re: Rockers?
Quote:
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Originally Posted by 97cavalier
well i am going to do the LT1 cam swap on my 305, will 1.6 rockers help at all? will they fit? how do they improve power?
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I've heard there's a good chance the pushrods will rub in the cyl head if you put on 1.6 rockers.
Why don't you just put all that extra money you're gonna spend dinking around with the 305 towards the 355?
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10-31-2006, 10:37 PM
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#8
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Re: Rockers?
ya, i did not know they were that close to rubbing. i think i will still do the swap, but i will stick with stock rockers. Thanx alot guys!
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95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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11-01-2006, 05:59 PM
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#9
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Most Seniorest Mod EVER!
Join Date: Feb 2004
Location: Lakewood, New Jersey
Posts: 7,506
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Re: Rockers?
You need to make sure your springs are adequate for the lift you can get with 1.6's. You need to look at the lift on your cam you are using. Then divide by 1.5 and then multiple by 1.6. Then look at the closed height of your spring and the bind height and figure out how much you have there to play with. You definetly don't want your springs binding.
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RIP Hypsi - I just want to express I will never be the same after having lost such a good friend. You meant alot to me and I feel I am a better person for having known you. Til the day we meet again my friend you will always be in my heart.
Mods: Weight reduction (I don't wear underwear)
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11-01-2006, 07:49 PM
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#10
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Re: Rockers?
ya i am putting a stock LT1 cam in my 305 with bigger springs.
__________________
95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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11-01-2006, 07:55 PM
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#11
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AF Enthusiast
Join Date: Jun 2005
Location: Salem, Virginia
Posts: 635
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Re: Rockers?
Be sure to check the specs of the cam. Most LT1s were created equal, but not all.
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'91 RS, forged LT1, GTP heads, blower cam, AFR Hydra-Rev kit, ram air intake, SLP 1 3/4 headers and 3" y-pipe, 3" Dynomax exaust, Yank 2800 TT stall converter, Strange 3.73 gears with Zexel-Torsen LSD, ect, ect...
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11-01-2006, 08:01 PM
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#12
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Most Seniorest Mod EVER!
Join Date: Feb 2004
Location: Lakewood, New Jersey
Posts: 7,506
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Re: Rockers?
Early LT1's had slightly more lift than later models. 
__________________
RIP Hypsi - I just want to express I will never be the same after having lost such a good friend. You meant alot to me and I feel I am a better person for having known you. Til the day we meet again my friend you will always be in my heart.
Mods: Weight reduction (I don't wear underwear)
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11-01-2006, 08:06 PM
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#13
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AF Enthusiast
Join Date: Aug 2005
Location: Columbia, Illinois
Posts: 2,868
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Re: Rockers?
well john, i am getting the cam off you so whats the specs?
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95 Z71 Silverado 4x4 ext. cab
Mods- Flowmaster Exhaust,Intake
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11-01-2006, 08:09 PM
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#14
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Most Seniorest Mod EVER!
Join Date: Feb 2004
Location: Lakewood, New Jersey
Posts: 7,506
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Re: Rockers?
I just sent you a reply PM and its out of a 93. So it would be the 93 - 95 F-body/Vette specs and like I said, to figure out the lift with 1.6 rockers you would divide by 1.5 and then multiply by 1.6.
__________________
RIP Hypsi - I just want to express I will never be the same after having lost such a good friend. You meant alot to me and I feel I am a better person for having known you. Til the day we meet again my friend you will always be in my heart.
Mods: Weight reduction (I don't wear underwear)
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11-01-2006, 08:12 PM
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#15
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AF Enthusiast
Join Date: Sep 2004
Location: Somewhere, Missouri
Posts: 3,663
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Re: Rockers?
Wow, talk about weak cams. After looking at aftermarket cam specs, those factory cams seem as if they wouldn't even allow an engine to run. But I guess that seems right from the factory.
So, you should end up with about 480"/.490" of lift I/E respectively with 1.6 rockers. I still say go with a slightly more aggressive cam.
__________________
Sold
1994 Camaro Z28
Current Car
2003 Monte Carlo SS
New Toy
2009 Kawasaki Ninja 500R
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