Roller Rockers
Roller Rockers What kind of gains do you see from just doing roller rockers on a bolt on z28? I've been thinking about doing some 1.7 roller rockers on mine. How much horsepower would I get out of that?
You can probably expect 10 or 15 rear wheel from going to 1.7s. Stock valvesprings will be past coil bind with 1.7s, so I would recommend upgrading to the Crane 10308 kit. The popular replacement LT4 springs will be marginally close to coil bind and I wouldn't chance it. However if you went with 1.6s, you can use the LT4 springs without a problem (seriously cheaper) and see similar gains. 1.7s might need to be clearanced for the springs too, but I have no first-hand experience with 1.7s.
1.7's are good for stock cams but if you plan on upgrading cams the 1.7's mighe be abit much. i went with 1.6's and noticed a much smoother and torqueier lower end and a peppier upper. i also have CC 918's. idk what exactly # gains i saw but it was noticeable
I'm not sure if i'm going to do a cam or not so I think that I'm going to go with 1.6's just to be safe. Can I run them on stock springs? Or will i have to get new ones? Could you show me some good 1.6's and some good springs to go along with them.
No, you cannot use stock springs, cheapest route would be to get some LT4 springs. If you plan to go with a cam, I would use some Comp 918's or some PAC 1218's springs.
Joined: Oct 2005
Posts: 1,419
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From: Holland Twp/Milford, New Jersey
You can use stock spring with 1.6 RRs. There have been many successful stories about that. Out of personal experience, I gained about an average of .2sec & 1.5mph with my 1.6RR/matching PCM tune. With the 1.7s, you'll need new springs, no doubt. As Elliott's94Z said, typical gains from 1.6RRs are 10-15rwhp. You'll need a tune though, so the PCM doesn't cut back on injector pulse.
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Verdad Gallardo You can use stock spring with 1.6 RRs. There have been many successful stories about that. Out of personal experience, I gained about an average of .2sec & 1.5mph with my 1.6RR/matching PCM tune. With the 1.7s, you'll need new springs, no doubt. As Elliott's94Z said, typical gains from 1.6RRs are 10-15rwhp. You'll need a tune though, so the PCM doesn't cut back on injector pulse.
Yes it will work fine. LT4 springs can be had for $50. But if you ever plan to do a cam, I recommend that you get 7/16" stud NSA full roller rockers (Comp 1.6 NSA ProMagnums for example). That will require ARP 7/16" rocker arm studs ($40), guideplats ($16), and hardened pushrods. Then when the time comes for a cam, you just have to upgrade your springs, and slide the cam in, that's it, the rest of the valve train can be reused and can take just about anything you throw at it.
http://www.golenengineservice.com/html/lt1_facts.html
click on the link and scroll down to the bottom. Cut the supports as indicated and you should be able to fit just about any rockers.
click on the link and scroll down to the bottom. Cut the supports as indicated and you should be able to fit just about any rockers.
so if I got this set of rockers
http://store.summitracing.com/partde...6&autoview=sku
Could I just get some lt4 springs and then thats good? Where could I find the lt4 springs too? And sorry for being such a noob about this. And dont worry I'm not doing it myself I have a friend who is going to do it and I'd help him.
http://store.summitracing.com/partde...6&autoview=sku
Could I just get some lt4 springs and then thats good? Where could I find the lt4 springs too? And sorry for being such a noob about this. And dont worry I'm not doing it myself I have a friend who is going to do it and I'd help him.
so if I got this set of rockers
http://store.summitracing.com/partde...6&autoview=sku
Could I just get some lt4 springs and then thats good? Where could I find the lt4 springs too? And sorry for being such a noob about this. And dont worry I'm not doing it myself I have a friend who is going to do it and I'd help him.
http://store.summitracing.com/partde...6&autoview=sku
Could I just get some lt4 springs and then thats good? Where could I find the lt4 springs too? And sorry for being such a noob about this. And dont worry I'm not doing it myself I have a friend who is going to do it and I'd help him.
