Just put a set of Crane 1.8 roller rockers on my friends
2007 GXP 5.3l.
Has anyone just upgraded there rockers on a LS2?
It was a three hour job, think he may have pick up a couple of ponies.

What do you think?

 

I was going to do the same! but alot of people say it's not worth it to do it w/ all part around $800.00 for about 10-15hp. cam's will do alot more!

 

Tony Mamo stated he consistantly got 12rwhp from the 1.7 cranes in addition to a 224/228 cam. Reduced friction and more lift other than at just peak were the contributing factors. It isnt just the lift changes from 1.8's that give you power.

 

I have the Crane Gold Race 1.8's on my LS2. I did not do a before and after dyno so I can't really tell you what difference they made. I could feel the difference in the mid-range and up. I still hadn't tuned out torque management, yet so I can't tell you about the bottom end at low speeds. Many forum members say that an increase of 10HP is the minimum that can be felt by the average driver, so my butt dyno agrees with the 10-15HP or so that people get when they objectively measure the before and after with these rockers.

I am happy with the rockers. At the time I did them I didn't want a cam. Another poster pointed out that you can get more out of a cam. I agree but a cam also costs more. Assuming that installation labor/gaskets/fluids are included for either install, a cam costs twice as much as the rockers. I would guess that a cam that has the same impact on drivability as the rockers (that is, absolutely none) would increase the power by twice as much as the rockers. So, factoring in driveability, I think that the rockers and cam are approximately a breakeven in terms of HP/$. For another $300 you could add an underdrive pulley to the cam installation with no aditional labor and pick up another 7-10 HP. This favors the cam in terms of HP/$.

If you relax the driveability criterion a little bit, the cam is a hands-down winner even without the other things that really make a cam shine.

However, some people don't want to put in a cam for various reasons, such as; ease of removal, total cost, detectability, driveability, etc. For these people, the rockers are an excellent choice.

 

This a great idea. Get the rockers and a cam!

 

I have my cam done aready, So if I add 1.7 rollers I can pick up some more hp?

 

 

I am going to install the Crane quick lift rockers with the stock cam. I figure at around 700 bucks for the kit if I pick up 12 rwhp with a better than stock part then $/hp it is a little price, but a much better bang for the buck that a cat back exhaust!

 

2 words...upgrade springs

They will float above 6000... Maybe ok on GXP, not cool on Vette who likes to REV

 

I had crane 1.8's on a 224/230 xer cam and the crane 1.7's on my 228/232 and neither had float. Tony Mamo used the crane 1.7's on his 490rwhp C5 that had AFR heads and a baby 224/228 xer cam. By the way it had tons of low to mid range power.

They weigh 152 grams compared to the 140 gram stockers but the reciprocating weight is the same as per crane. I had inquired about the rumor that they cause valve float but no one responded to my post. Please quote the source of this info unless you mean the float comes from the stock springs.

Tony got 12rwhp for the 1.7's.

 

The 1.7's are 1.79 off the seat. They gain 12rwhp as dyno'ed and posted by Tony Mamo.

Cartek stated they observed some high RPM instability but I didnt see it on any dyno sheets that were posted on that. VetteNO2 sent me his dyno sheet and there wasnt any high rpm ripple on the graph. I dont know what smoothing was used to produce the graph but I tuned that car and there is no high rpm fall-off and it pulls great.

 

About three hours
The second time around

Vette dream please stay on the C5 forum please

 

It's 2:28AM, I'm tired from all the hurtings I've done to the local Vettes this evening, please excuse me for the non-witty comeback, please.

Please.

 

As SpinMonster eloquently reported above, you bet you'll get more with your aftermarket cam. 12 RWHP is a commonly reported number for the 1.7's and don't forget that the Crane's quick lift 1.7's will get you some additional torque, too. For me, his is the good part. Thanks, Spin! Depending on your cam, you may be even be able to use the 1.8's. Call Crane or Vinci High Performance. They can tell you.

 

Thanks

 

"Speed Inc" stated the stock 1:75s are very sturdy pieces for high HP Applications, I thought about doing the same they recommended the cam swap instead.