1.7 Rockers? - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
Reply
 
LinkBack Thread Tools
post #1 of 18 (permalink) Old 04-01-2007, 05:39 PM Thread Starter
Regular Member
 
Scott Anderson's Avatar
 
Join Date: Mar 2007
Posts: 657
 
1.7 Rockers?

Where can I get some?

Also, I know you have to modify the valve covers for them to fit, is there anything else NECESSARY for them to be installed? In 3800s you can just bolt them in and forget about it basically. I assume it's the same way in an LT1?


97 Trans Am LT1
Nothing compared to the LSx/L67/VQ... NOTHING.
00 YZF-R6
It'll run 10s, but a stock LS1 could take it... EASY.
Scott Anderson is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 04-01-2007, 08:09 PM
Administrator
 
03slowZ06's Avatar
 
Join Date: Jul 2006
Location: Jacksonville
Posts: 7,520
 
Send a message via Yahoo to 03slowZ06
Valve springs for 1, pushrods fo 2. Were to get them im not sure.

03 Z06, LTs, A&A P1SC running 6psi, 550/471
Quote:
Originally Posted by 94FormulaBird View Post
drivers side is a dream....passenger side on the other hand...i lost 2 screwdrivevers and a socket when i chucked them in the woods

u can do it



I am permanently banned from all petting zoo's for getting to friendly
03slowZ06 is offline  
post #3 of 18 (permalink) Old 04-04-2007, 06:33 PM
Regular Member
 
JAKEJR's Avatar
 
Join Date: Mar 2007
Location: Kempner, Texas
Posts: 1,605
 
You could try a Google search for the company who sells them or, use the Search feature on the CorvetteForum (Forums.CorvetteForum.com) because I know there was at least one guy who bought a set.

If memory serves, he wasn't happy with them though; can't recall the specifics.

I did a quick search for you and best I found were 1.65s.

Another thought is the aggressive ramps that are on high performance hydraulic roller camshafts. I've read where going with 1.7s on cams with aggressive ramps causes valve float as the RPMs climb. Seems the 1.7s causes the lifters to be unable to follow the cam's lobes.

Hope this helps.

Jake
JAKEJR is offline  
Sponsored Links
Advertisement
 
post #4 of 18 (permalink) Old 04-04-2007, 07:02 PM
Regular Member
 
Captainofiron's Avatar
 
Join Date: Sep 2006
Location: New Mexico
Posts: 679
 
I think scorpion makes some for the self aligning GM sbc.

Also I think crower makes some,

BUT they only make aluminum rockers, IMO the aluminum rockers wouldnt be good for a daily driver

97 Trans Am WS6, LT1 factory 4bolt freak, M6, FLP LTs, Cutouts, Flowmaster catback, Accel 300+wires, Jet Airfoil, K&N air filter, Ferco Bellows, MSD Opti and Coil, Beehive Springs, CAT 1.65 Steel Full Roller Rockers
68 Firebird 400, YC 400, Hbeam rods, ported 670 heads (2.11i, 1.77e valves), 1.65 RRs, Torker 2 intake, Nodular Crank, Eaton Limited Slip, 3.55 gears, M20 M4
65 Impala SS 327 Camelhump Heads, 650 carb, M20 M4 12 bolt 3.73 gears
91 Jeep XJ 2 door. 4X4 NP 231 TC, AX15 M5
Captainofiron is offline  
post #5 of 18 (permalink) Old 04-04-2007, 07:44 PM
Founder
 
Chris 96 WS6's Avatar
 
Join Date: Jul 2005
Location: Nashville, TN
Posts: 7,472
 
Just FYI Scott, stock the LT1's are 1.5. 1.6 is the common upgrade ratio. 1.7s are available but hard to find.

Any of our sponsors, such as CSSI, can hook you up with a set of full roller 1.6s. The valve cover mods are minor, and yes you need to upgrade your valvesprings.

- 2007 Sunburst Orange HHR LT - Daily Driver :: Tuned by Trifecta
- 1996 Trans Am WS6 -- SOLD 6/07

- TNfbody.com -- Founding Member
Chris 96 WS6 is offline  
post #6 of 18 (permalink) Old 04-04-2007, 08:49 PM
Regular Member
 
96lt1m6's Avatar
 
Join Date: Aug 2006
Posts: 225
 
Lt4's came with aluminum 1.6s and they were designed to be driven daily
Quote:
Originally Posted by Captainofiron View Post
I think scorpion makes some for the self aligning GM sbc.

Also I think crower makes some,

BUT they only make aluminum rockers, IMO the aluminum rockers wouldnt be good for a daily driver

Justin Meyers in colorado please pm me..




96lt1m6 is offline  
post #7 of 18 (permalink) Old 04-04-2007, 08:51 PM
Administrator
 
03slowZ06's Avatar
 
Join Date: Jul 2006
Location: Jacksonville
Posts: 7,520
 
Send a message via Yahoo to 03slowZ06
He was talking the 1.7's they are a big ratio and would cover a very large path on the valve.

03 Z06, LTs, A&A P1SC running 6psi, 550/471
Quote:
Originally Posted by 94FormulaBird View Post
drivers side is a dream....passenger side on the other hand...i lost 2 screwdrivevers and a socket when i chucked them in the woods

u can do it



I am permanently banned from all petting zoo's for getting to friendly
03slowZ06 is offline  
post #8 of 18 (permalink) Old 04-04-2007, 10:14 PM
Founder
 
Chris 96 WS6's Avatar
 
Join Date: Jul 2005
Location: Nashville, TN
Posts: 7,472
 
Yeah, but his comment about the 3800s makes me think he thinks 1.7s are the standard upgrade....the, just like the LS1's are 1.7 from the factory and the upgrade is to 1.8s.

- 2007 Sunburst Orange HHR LT - Daily Driver :: Tuned by Trifecta
- 1996 Trans Am WS6 -- SOLD 6/07

- TNfbody.com -- Founding Member
Chris 96 WS6 is offline  
post #9 of 18 (permalink) Old 04-04-2007, 10:48 PM
Administrator
 
03slowZ06's Avatar
 
Join Date: Jul 2006
Location: Jacksonville
Posts: 7,520
 
Send a message via Yahoo to 03slowZ06
Quote:
Originally Posted by Chris 96 WS6 View Post
Yeah, but his comment about the 3800s makes me think he thinks 1.7s are the standard upgrade....the, just like the LS1's are 1.7 from the factory and the upgrade is to 1.8s.
Mt reply was to the fact that 1.6's are aluminum and being daily driven. Compared to 1.7's. Not about it being an upgrade.

03 Z06, LTs, A&A P1SC running 6psi, 550/471
Quote:
Originally Posted by 94FormulaBird View Post
drivers side is a dream....passenger side on the other hand...i lost 2 screwdrivevers and a socket when i chucked them in the woods

u can do it



I am permanently banned from all petting zoo's for getting to friendly
03slowZ06 is offline  
post #10 of 18 (permalink) Old 04-04-2007, 11:15 PM Thread Starter
Regular Member
 
Scott Anderson's Avatar
 
Join Date: Mar 2007
Posts: 657
 
I know 1.7s aren't common. I know 1.6s are. The guy who owned the motor I bought had 1.7 rockers and his engine seemed to LOVE it. So I was looking for some.


97 Trans Am LT1
Nothing compared to the LSx/L67/VQ... NOTHING.
00 YZF-R6
It'll run 10s, but a stock LS1 could take it... EASY.
Scott Anderson is offline  
post #11 of 18 (permalink) Old 04-05-2007, 12:07 PM
Regular Member
 
Captainofiron's Avatar
 
Join Date: Sep 2006
Location: New Mexico
Posts: 679
 
Quote:
Originally Posted by 96lt1m6 View Post
Lt4's came with aluminum 1.6s and they were designed to be driven daily
"designed" yea maybe,the more correct term would be it was cheap and passed our safety factors so GM produced it.

well have you ever heard of a thing called engineering metallic fatigue?

under a cyclic load and with high temperatures present in the cylinder head it can cause fatigue in a lower strength metal such as Aluminum, not only that but aluminum also has both lower possions ratio and lower shear and elasticity moduli
This leads to rocker arms failing at the fulcrum, I have seen happen many times, on "quality" aluminum rockers such as the Crane gold.

Let me give you an example a plain jane 1040 Steel alloy has a Yield strength rating of 60500 PSI, while the hardcore 7075 Aluminum alloy has a yield strength rating of 15000 PSI, huge difference.

my point is these aluminum parts e.g. rockers or connecting rods are meant to be used in short bursts, like a race car, there is to great a chance of failure if used normally for long periods of time on cyclic loading.

Im not saying they wont work, but I wouldnt put them in my car

97 Trans Am WS6, LT1 factory 4bolt freak, M6, FLP LTs, Cutouts, Flowmaster catback, Accel 300+wires, Jet Airfoil, K&N air filter, Ferco Bellows, MSD Opti and Coil, Beehive Springs, CAT 1.65 Steel Full Roller Rockers
68 Firebird 400, YC 400, Hbeam rods, ported 670 heads (2.11i, 1.77e valves), 1.65 RRs, Torker 2 intake, Nodular Crank, Eaton Limited Slip, 3.55 gears, M20 M4
65 Impala SS 327 Camelhump Heads, 650 carb, M20 M4 12 bolt 3.73 gears
91 Jeep XJ 2 door. 4X4 NP 231 TC, AX15 M5

Last edited by Captainofiron; 04-05-2007 at 12:13 PM.
Captainofiron is offline  
post #12 of 18 (permalink) Old 04-05-2007, 04:56 PM
Regular Member
 
JAKEJR's Avatar
 
Join Date: Mar 2007
Location: Kempner, Texas
Posts: 1,605
 
I read that GM went with RRs on the LT4 because the ball and sled type (used on the LT1) showed ball galling at higher rpms.

Since the LT4 was designed to run 1.6s and to redline at about 500 rpms higher than the LT1, the move was made.

Here's a link that may help: http://www.grandsportregistry.com/lt1vslt4.htm

Jake
JAKEJR is offline  
post #13 of 18 (permalink) Old 04-05-2007, 06:07 PM
Regular Member
 
MikeKey's Avatar
 
Join Date: Nov 2005
Location: Virginia Beach
Posts: 33
 
Send a message via AIM to MikeKey Send a message via MSN to MikeKey Send a message via Yahoo to MikeKey
Why do you need 1.7s on a stock motor? Just because you heard someone say something about them? Buy an exhaust.



Michael Key - hrfbody.com | MikeKey.net
MikeKey is offline  
post #14 of 18 (permalink) Old 04-05-2007, 07:50 PM Thread Starter
Regular Member
 
Scott Anderson's Avatar
 
Join Date: Mar 2007
Posts: 657
 
Quote:
Originally Posted by MikeKey View Post
Why do you need 1.7s on a stock motor? Just because you heard someone say something about them? Buy an exhaust.
Thanks for your valuable input.


97 Trans Am LT1
Nothing compared to the LSx/L67/VQ... NOTHING.
00 YZF-R6
It'll run 10s, but a stock LS1 could take it... EASY.
Scott Anderson is offline  
post #15 of 18 (permalink) Old 04-06-2007, 01:40 AM
Regular Member
 
Captainofiron's Avatar
 
Join Date: Sep 2006
Location: New Mexico
Posts: 679
 
yea he is right get some headers first, the stock exhaust is rather restrictive and you wouldnt see as big of gains with more lift, honestly I think RR's should one of the last bolt on mods, I know I did alot of stuff first before I started buying stuff for my RR swap

97 Trans Am WS6, LT1 factory 4bolt freak, M6, FLP LTs, Cutouts, Flowmaster catback, Accel 300+wires, Jet Airfoil, K&N air filter, Ferco Bellows, MSD Opti and Coil, Beehive Springs, CAT 1.65 Steel Full Roller Rockers
68 Firebird 400, YC 400, Hbeam rods, ported 670 heads (2.11i, 1.77e valves), 1.65 RRs, Torker 2 intake, Nodular Crank, Eaton Limited Slip, 3.55 gears, M20 M4
65 Impala SS 327 Camelhump Heads, 650 carb, M20 M4 12 bolt 3.73 gears
91 Jeep XJ 2 door. 4X4 NP 231 TC, AX15 M5
Captainofiron is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome