LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Do 1.6rr gain anything on stock motor

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Old 03-01-2007, 04:31 PM
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Default Do 1.6rr gain anything on stock motor

Is it worth it to do this mod or should i wait until i need to rebuild the motor.
Old 03-01-2007, 04:49 PM
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I heard it can give you about 15 to 25 HP increase. i asked the same question.
Old 03-01-2007, 04:59 PM
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It's a simple mod, and if you can get them for cheap, go for it.
Old 03-01-2007, 05:00 PM
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Thats what I heard too. I just wanted to know if it was true cuase like everyone else I want to go faster. What is everything needed to complete this like the valve cover mod. What other new parts are needed. Do I get SA or NSA.
Old 03-01-2007, 05:00 PM
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personally for me it was a great mod, but my engine had alot of miles and I changed the valvesprings also.
Old 03-01-2007, 05:03 PM
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was wondering the same thing girlfriends getting a 94 Z that has flowmasters and im putting a CAI i got around on it.. any cheap/basicaly free mods would be cool u can find rockers on ebay all day

btw regular SBC ones will work on our lt1s or am i wrong
Old 03-01-2007, 05:04 PM
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well im at 116,xxx miles so i wanted to do a refresh on the valvetrain.
Old 03-01-2007, 05:12 PM
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btw whats stock pushrod length?
Old 03-01-2007, 05:46 PM
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if you do go to RR make sure and get full roller rockers, with a roller bearing fulcrum and tip. The roller tip rockers arent really worth it.

Also the good ones are REALLY EXPENSIVE. So I wouldnt pay 300 something dollars just for around 15hp.

I was kicking around the idea of buying the CAT 1.65 steel RR. They are the same design as Comp Cam Pro Magnums. And they are only 190 bucks straight from the manufacturer.
I wouldnt buy an Aluminum set, a couple people have trashed Crane Golds on their DDs. Its not so much a strength issue with the Aluminum, but creep and fatigue in the aluminum hits alot faster than in a steel (its because the endurance limit for the aluminum is lower and the melting temp is lower also)
Old 03-01-2007, 06:03 PM
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SBC rocker will work if you use guideplates. LT1s use self aligning rockers.

stock pushrod length is 7.200"
Old 03-01-2007, 06:23 PM
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I was searching on summit and they have some pretty competative prices around the 200 250 range. I wanna do that and headers at the same time. so what is all needed to install these:
new hardened pushrods
valve springs
valve cover mod
and what else.
Old 03-01-2007, 07:54 PM
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lt4 knock sensor???
Old 03-01-2007, 08:51 PM
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Originally Posted by 95greenZ
SBC rocker will work if you use guideplates. LT1s use self aligning rockers.

stock pushrod length is 7.200"
yea I would go with some new rocker studs and get guideplates, that way you can use NSA rockers, plus I think some manufacturers make narrow body versions that are NSA
Old 03-01-2007, 10:10 PM
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What brand does everyone recomend? I see alot comp cams but theres so many diferent ones. And anyone whos done it before I need a parts list so i could get to work. I have all the tools I need at my expense in my auto class.
Old 03-01-2007, 10:21 PM
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Aw man, I already have a set of Crane Gold 1.6 full rollers I wanted to use
Old 03-01-2007, 11:01 PM
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Originally Posted by Formula350
Aw man, I already have a set of Crane Gold 1.6 full rollers I wanted to use
dont get me wrong they are good, but I wouldnt use them on my dd, only on a race car, since race cars have quick high loads, the aluminum can handle that, but on a dd the load changes and its over a long period of time the aluminum can fatigue and they usually crack right in the middle at the fulcrum, a buddy mine with a 68 Firebird almost like mine, except he had a chevy 350 was running those things he was on the highway and he heard a pop and he lost a cylinder or two I cant remember, but it was crazy looking he showed me that rocker it was destroyed. I also remember reading in car craft that something similar happened to them
Old 03-02-2007, 01:42 PM
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I just picked up comp cams Roller Rockers 1.6 Ration NSA. They look like a nice peice. I have not installed them yet.

Jason
Old 03-03-2007, 10:42 AM
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I put LT4 springs and Comp pro-mag 1.6 on my bolt-on LT1 and there was more power in the 5K RPM range. The peak HP was bumped up about 200 RPM or so. great mod.

I found that my 7.200" pushrods were too long for these mods, the rocker geometry was bad off towards the header side. I had to use 7.050" pushrods to get perfect geometry.
Old 03-03-2007, 10:55 AM
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I use crower 1.6 RRs without problems. You are gonna get some more valvetrain noise though so I would say get a LT4 knock module.



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