LS1 1.8 roller rockers
LS1 1.8 roller rockers Hey,
Gonna pick up some 1.8 roller rockers from ebay, the aluminum ones that can be found for about $300. Any ideas on those?
My car is a daily driver (look at signature) and just wanted to add a quick direct bolt on 15hp.
Gonna pick up some 1.8 roller rockers from ebay, the aluminum ones that can be found for about $300. Any ideas on those?
My car is a daily driver (look at signature) and just wanted to add a quick direct bolt on 15hp.
All I am going to say, is do some research before buying anything.
I have no clue what brand they are.
Also that most cams, if you decide to upgrade do not want you running the 1.8's, they are ground with a 1.7 rocker in mind.
I have no clue what brand they are.
Also that most cams, if you decide to upgrade do not want you running the 1.8's, they are ground with a 1.7 rocker in mind.
I would be very leery of those rockers, if you are going to do this buy some that will provide some life and are designed to provide more power. The Cranes are probably the best out there for this. However, with either you also need new valve springs, the stock springs won't keep up with the new acceleration rates of the higher lift rockers.
I would be very leery of those rockers, if you are going to do this buy some that will provide some life and are designed to provide more power. The Cranes are probably the best out there for this. However, with either you also need new valve springs, the stock springs won't keep up with the new acceleration rates of the higher lift rockers.
Be careful with any of these, including the Cranes. For starters, you will be asking more out of your valve train so a new set of valve springs is in order. The Cranes require shorter pushrods, guide plates and studs. They make a kit that includes all of the parts (except the valve springs) but its not $100 more. They also make a kit that is simply rockers and poly-locks. That is about $100 more. In either case, make sure you understand what supporting components are required for successful installation. It will allow you to plan better and not be disappointed with the parts.
crane cams LS1 1.8 quick lift rocker arm kit= #144759-16
this is a complete kit, which includes everything that you need besides valve springs. I recommend dual springs, either there #144832 or #144833-16 springs. They will also require there spring locators #144460-16 and new gm seals for there direct bolt in replacement.
this is a complete kit, which includes everything that you need besides valve springs. I recommend dual springs, either there #144832 or #144833-16 springs. They will also require there spring locators #144460-16 and new gm seals for there direct bolt in replacement.
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On The Tree
Joined: Dec 2004
Posts: 114
Likes: 0
From: Vancouver, WA.
Look at the Yella Terra #6646s. They 1.8s that don't require guides, studs, or different push rods, although I'd stick in new push rods anyway. The 6646s are brand new and they drop in, no grinding like with the Cranes. New Era Performance has them on sale.
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Verdad Gallardo Crane's don't require grinding. If you correctly set up the Yella Terra's, you will be buying new longer pushrods. Add the pushrods to the price of the rockers, you are just about to Vinci's price for the Crane kit so its almost a wash at that point.
no grinding, unless it's an AFR head. The crane rockers work, and make power. they are salty in price, but they work.
On The Tree
Joined: Dec 2004
Posts: 114
Likes: 0
From: Vancouver, WA.
They're going in an 01 Z06 and I plan on replacing the push rods anyway. What length are you suggesting. These are the new lightweight Yellas.
The last set of Yella Terra's I installed on stock heads required the supplied shims to get the wipe pattern correct. Several have found the same thing. Most guys not running the shims also didn't check the wipe pattern. If you are going with the higher ratio, depending on how they achieve the new ratio the need for shims can vary (most manufacturers move the pushrod cup closer to the rocker fulcrum to get the higher ratio). When I set up the stock heads and shims, we used a 7.500" pushrod. However, best bet is to buy the adjustable pushrod and measure as pushrods are very critical as is the wipe pattern. These two little things can make or break how the car performs.
On The Tree
Joined: Dec 2004
Posts: 114
Likes: 0
From: Vancouver, WA.
The last set of Yella Terra's I installed on stock heads required the supplied shims to get the wipe pattern correct. Several have found the same thing. Most guys not running the shims also didn't check the wipe pattern. If you are going with the higher ratio, depending on how they achieve the new ratio the need for shims can vary (most manufacturers move the pushrod cup closer to the rocker fulcrum to get the higher ratio). When I set up the stock heads and shims, we used a 7.500" pushrod. However, best bet is to buy the adjustable pushrod and measure as pushrods are very critical as is the wipe pattern. These two little things can make or break how the car performs.
before we button it up. I am going with the 1.8s so the geometry will change. As stated above, get your wipe correct first then measure for the pushrod length. I used checking springs to check the wipe pattern. Very easy to do and will ensure good geometry and minimum valve guide wear.
On The Tree
Joined: Dec 2004
Posts: 114
Likes: 0
From: Vancouver, WA.
AHA! I think you answered my question with a post you made on another thread. The process of shimming will determine the swipe and then you just get push rods to match the end result of the shimming.
Last edited by Last C5; Nov 25, 2007 at 06:39 PM.
The last set of Yella Terra's I installed on stock heads required the supplied shims to get the wipe pattern correct. Several have found the same thing. Most guys not running the shims also didn't check the wipe pattern. If you are going with the higher ratio, depending on how they achieve the new ratio the need for shims can vary (most manufacturers move the pushrod cup closer to the rocker fulcrum to get the higher ratio). When I set up the stock heads and shims, we used a 7.500" pushrod. However, best bet is to buy the adjustable pushrod and measure as pushrods are very critical as is the wipe pattern. These two little things can make or break how the car performs.
