1.6:1 Roller Rockers ?
Thread Starter
6th Gear
Joined: Sep 2007
Posts: 6
Likes: 0
From: Spokane Washington
1.6:1 Roller Rockers ?
Hello I am new to this forum and I have a few questions. I imagine that these have been asked before so sorry to rehash old issues.
First off I have read about many who have installed 1.6:1 roller rockers with a new cam but what about the rockers alone with the stock cam? Will it do me much good? or am I waisting my money ( I already have the rockers hanging around the shop). What problems will I run into? Will the stock heads accomodate that much lift?
Also I am looking for some long tube headers and dont know which ones would be the best for the money or just the best for that matter. Also where is the best place to purchase them?
I have a all stock 1995 c4 LT1 and plan for many modifications. It has low miles on it so I dont want to realy break into the block but would like to do some things to it, Im not interested in changing out the cam at this time ,dave
First off I have read about many who have installed 1.6:1 roller rockers with a new cam but what about the rockers alone with the stock cam? Will it do me much good? or am I waisting my money ( I already have the rockers hanging around the shop). What problems will I run into? Will the stock heads accomodate that much lift?
Also I am looking for some long tube headers and dont know which ones would be the best for the money or just the best for that matter. Also where is the best place to purchase them?
I have a all stock 1995 c4 LT1 and plan for many modifications. It has low miles on it so I dont want to realy break into the block but would like to do some things to it, Im not interested in changing out the cam at this time ,dave
Last edited by david M; Sep 19, 2007 at 11:32 PM.
Safety Car
Joined: Jun 2006
Posts: 3,629
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From: FL
The stock valve springs are very close to coil bind using 1.6 ratio rockers, an inexpensive solution is to use LT4 springs, no other changes should be necessary except for removing the drip tabs from the valve covers. Changing valve seals is a good idea while you are in there. Can't advise you on the headers, but I'm sure someone else will be able to.
Pro
Joined: Jul 2006
Posts: 635
Likes: 1
Hi I have proform alum 1:6 roller rockers left over from anther project. will they fit under the plastic valve covers of a 93 vette? I know on the other car they rubbed and you had to bend or grind on valve cover to keep from hitting. Thanks
Racer
Joined: Jul 2004
Posts: 285
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From: San Diego CA
The stock valve springs are very close to coil bind using 1.6 ratio rockers, an inexpensive solution is to use LT4 springs, no other changes should be necessary except for removing the drip tabs from the valve covers. Changing valve seals is a good idea while you are in there. Can't advise you on the headers, but I'm sure someone else will be able to.
Use the LT-4 springs (about $40 SDPC). Pushrod length (7.200 inch) remains the same. You will (again as noted by top tech) have to remove the drip tabs from the underside of the valve covers - they WILL hit. You must complete your CF profile data
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
I am really happy with my Exotic Muscle ceramic coated long tube headers. They go on sale about every 6 months with a group purchase. Some other options that I am aware of are Melrose, Stainless Works, and TPiS headers.
Thread Starter
6th Gear
Joined: Sep 2007
Posts: 6
Likes: 0
From: Spokane Washington
Roller rockers?
So is that all there is to the Roller rocker thing? doesnt sound too difficult to me. How about the headers? are the long tube that much better than the shorty headers? do the shorties do any thing at all compared to the stock manifolds?
Burning Brakes
Joined: Nov 2004
Posts: 1,057
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From: Warren Ohio
Rockers (and headers) produce more noise, which the LT1's computer has a tendency to interpret as knock, and pull timing. The LT4 has better knock-detection logic, so you'll want to consider an LT4 knock module...runs about $30-35.
Last edited by 95PoloVert; Sep 22, 2007 at 11:47 PM.
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Burning Brakes
Joined: Nov 2004
Posts: 1,057
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From: Warren Ohio
How about the headers? are the long tube that much better than the shorty headers? do the shorties do any thing at all compared to the stock manifolds?
Also, I wanted to add Hooker 2151's to the list of LTs available for the LT1.
Last edited by 95PoloVert; Sep 22, 2007 at 11:50 PM.
Thread Starter
6th Gear
Joined: Sep 2007
Posts: 6
Likes: 0
From: Spokane Washington
roller rockers
Ok speaking of the knock sensor and the computor. At what point or stage of modifications would one want to reprogram the computor to make all this work. I dont plan on doing any major modifications beyond exhaust and intake mods
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
I also installed the LT4 knock "module", not the knock sensors.
Jake
Le Mans Master
Joined: Aug 2004
Posts: 5,141
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From: Metairie Louisiana
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Make sure that the rockers you have laying around are self-aligning. If not, you'll need guideplates and hardened pushrods to run them.
Rockers (and headers) produce more noise, which the LT1's computer has a tendency to interpret as knock, and pull timing. The LT4 has better knock-detection logic, so you'll want to consider an LT4 knock module...runs about $30-35.
Rockers (and headers) produce more noise, which the LT1's computer has a tendency to interpret as knock, and pull timing. The LT4 has better knock-detection logic, so you'll want to consider an LT4 knock module...runs about $30-35.
Melting Slicks
Joined: Apr 2003
Posts: 2,150
Likes: 6
From: NS
The LT4 knock module did nothing for my '95. Actually made it count false knocks like crazy. I went back to the LT1 module to solve the problem. Some others have experienced the same thing. If you search my posts you should find lots of discussion.
Burning Brakes
Joined: Nov 2004
Posts: 1,057
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From: Warren Ohio
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
I have a the LT4 knock module in my 1995 also. The knock count seems to be ok with my headers and open exhaust but I don't have RR's or a cam installed yet.
Burning Brakes
Joined: Nov 2004
Posts: 1,057
Likes: 0
From: Warren Ohio
[QUOTE=rickreeves1;1562037623]oh, I was going by this site here on the numbers. http://speeddemonmotorsports.com/catalog/exhaustC4.html I didn't notice that they were not the long tubes. Are there any modifications needed to get the 2151's to work on a later C4? All the websites only list them up to 91. Thanks for the correction. Good to know.
[/quotes]
Well, the 2151's don't have any provisions for emissions, and you have to have a $7 O2 bung welded in. (The 2149's do...but I don't recall whether they will work with the LT1's emissions systems or not.)
The only other issue I recall are that the motor mount bolts needed to be reversed for clearance (5 mins each).
[/quotes]
Well, the 2151's don't have any provisions for emissions, and you have to have a $7 O2 bung welded in. (The 2149's do...but I don't recall whether they will work with the LT1's emissions systems or not.)
The only other issue I recall are that the motor mount bolts needed to be reversed for clearance (5 mins each).