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| DrDyno | 1.6 Roller Rockers | ||
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Guru Newb
 
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Hi All,
I'm looking at installing 1.6 Roller Rockers and LT4 valve springs and retainers in my '96 LT1. I'd like a reasonably good set of full roller rockers that are still affordable and I'm finding so many brands and configurations on the market that I'm confused. Any advice will be appreciated! |
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Posted on: 2014/3/16 5:04
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| Matatk | Re: 1.6 Roller Rockers | ||
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Webmaster
 
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Do you have a cam in the LT1 or is it stock?
There are several good brands out there. How about LT4 style roller rockers from GM to complement the springs? http://www.gmperformancemotor.com/parts/19210729.html |
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Posted on: 2014/3/16 11:46
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| bogus | Re: 1.6 Roller Rockers | ||
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Grand Imperial Pooh-Bah
 
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toss in the hot cam and you are rock'n it!
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Posted on: 2014/3/16 12:49
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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MatatK... Stock cam. The car came with the 3.07 rear axle so it's pretty peppy on the street. Thanks for the link to the LT4 Rockers. Most after market sets are about 10% cheaper... not critical but, if they're just as good or, even lighter, they may be the better performance value.
Bogus... I'm not planning on a cam change but want to get the best out of what it already is. The 1.6 rockers will (obviously) increase the current cam's lift figures while the Rollers will reduce some friction losses. My plans for the car are simply: 1.6 Roller Rockers, TPIS 52mm Throttle Body with the TPIS Air Deflector, bypassing the intake manifold hot water hoses, an unrestricted air box cover and (maybe) headers. (I'm reluctant about headers because I think their appearance would make the car harder to sell when it's time.) |
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Posted on: 2014/3/16 17:31
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| rklessdriver | Re: 1.6 Roller Rockers | ||
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Senior Guru
 
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I would recommend Scorpion. Their narrow body self aligning rockers.
PN SCP1036BL. $282.00 at Summit Racing. Will |
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Posted on: 2014/3/16 21:47
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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Quote:
Thanks, Rkless! Those look like just what the doctor ordered! Have you used them or know someone who has? |
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Posted on: 2014/3/16 23:29
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| BillH | Re: 1.6 Roller Rockers | ||
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The Stig Moderator
 
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Quote:
If Will says "Use them", use them. He's one of the 2 engine experts here. |
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Posted on: 2014/3/17 2:35
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Every man dies but not every man lives. |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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Quote:
Good enough for me! Thanks!! |
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Posted on: 2014/3/17 3:46
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| rklessdriver | Re: 1.6 Roller Rockers | ||
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Senior Guru
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We use Scorpion's rockers on most everything we build with stud mount rockers.
Top quality rocker arms and they are made in the USA right in Fla. Lifetime guarantee as well. I have used that particular 3/8 stud narrow body self algining model a few times on Vortec, LT1 and LT4 engines. It's great for mild bolt on stuff and requires minor modifications to LT1 (remove drip tabs) and none for LT4's except new 3/8 studs for those with the 10mm studs.... For higher RPM or more serious engines your better off with a big body non-SA rocker, 7/16 studs, guide plates and hardened pushrods... but the big body rockers require more mods to make them fit under the centerbolt valve covers. Will |
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Posted on: 2014/3/17 16:46
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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Quote:
Thanks, Will. I've read that to use 1.6 Rockers I have to change the valve springs on my LT1. Apparently, the exhaust valve springs may bind. The LT4 springs are supposed to be flatter springs which alleviates LT1 / 1.6 Rocker problems. Can you shine any light on that? Thanks! |
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Posted on: 2014/3/17 20:44
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| rklessdriver | Re: 1.6 Roller Rockers | ||
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Senior Guru
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Yes you should change the valve springs if you go to 1.6 rockers on an LT1. If not the factory LT1 springs are very close to coilbind and in some cases where factory tollerances stack up the wrong way, too close... not to mention depending on how many miles and how much hard use they have had, they could not have enough spring rate to control the valve train in all instances.
The factory LT4 springs actually set at a slightly higher seat height (1.780) via slightly different retainers and they are different wire dia.... thats how they get the extra lift out of them (up to .525) They are cheap, and solve all the potential problems of keeping the LT1 springs with 1.6 rockers. $37.00 LT4 spring kit PN 12495494 $18.00 LT4 retainer kit PN 12495492 You need both. Will |
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Posted on: 2014/3/18 23:31
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1984 Corvette. 434 SBC with a Powerglide. Best pass - 8.48@160MPH 1.23 60ft on MT 275/60R15 Radials. 1972 Corvette. LS5 454 BBC with M20 4 speed. Best Pass - Doing good to just pass a gas station. |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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Quote:
Thanks, Will... I really appreciate your input! Should be a couple of weeks and I'll let you know how it turned out. Thanks, again!! |
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Posted on: 2014/3/18 23:43
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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GOT THE PARTS...
Scorpion 1.6 Roller Rockers, LT4 Springs, LT4 Keepers & Keys Will be installed next week! Attach file:  Rollers - Small.jpg (35.23 KB) |
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Posted on: 2014/3/30 17:33
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| Matatk | Re: 1.6 Roller Rockers | ||
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Webmaster
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Great! Take some pictures along the way and post them up.
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Posted on: 2014/3/30 23:58
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2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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| DrDyno | Re: 1.6 Roller Rockers | ||
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Guru Newb
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Well, the installation was completed today, by Vern Carmack at Vern's Chevy Service in Clearwater, FL. Vern's Corvette credentials are well respected in this part of the world and I've used him several times with excellent results.
I'm sorry to say I have no pics of the install... Vern always soaks roller rockers in oil before installation and said pics would have just been too cumbersome and messy. However... the results were obvious from the moment I started the car! It idled smoother, about 100 RPM higher at warm idle (I thought that was electronically controlled by the PCM) and the exhaust note is definitely deeper. My 3.07 geared, automatic LT1 was reasonably quick before the new parts... it's definitely quicker now! I can not imagine anyone saying they felt little or no change with 1.6 roller rockers. Maybe they have the 2.59 gears or maybe they didn't install the LT4 springs with the rockers. In this car, there is no denying the increased acceleration. I haven't drag raced a Corvette in over thirty years. But, as luck would have it, a little black (recent model) GTO and I were getting onto the parkway at the same time, with him just slightly ahead of me. I pulled out to the third lane (passing him) and nailed the Corvette, catching 2nd gear, just to see how it ran. He must have already decided to give it a go and punched it just before I did so we were about neck and neck when I hit it. I saw him on my right and decided to stay in the throttle with him just for grins. What I didn't expect was my 18-year old LT1 slowly walked away from him all the way through third... with the A/C on! We then caught up with traffic and got off the gas. I know I'm too old for street racing but... that sure felt good! |
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Posted on: 2014/4/4 4:42
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John G. St. Petersburg, FL "If it seems like you're in control... you're not going fast enough!" Mario Andretti |
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| Matatk | Re: 1.6 Roller Rockers | ||
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Webmaster
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Glad it turned out well and exceeded your expectations!
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Posted on: 2014/4/4 11:31
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_________________
2002 EBM convertible, Magnusson supercharger, cam, headers, etc. 1989 Corvette...RIP |
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