I currently have Comp918's and a 224 cam. I want the G5X2 cam, but I will need to strengthen the valvetrain i.e. springs. Will the Rev duals hold up to the G5X2 cam? I want any info on the Rev dual spring set-up. All feedback is appreciated. I am trying to avoid pulling the heads again. I don't want to have to send them in for machining for Comp springs. I would sooner stay with my current set-up.

Thanks,
Matt

 

I think thats what LG recomends, and you can even look into the new crane duel springs as well

 

The REVs are more than up to the job. They fit on the heads with no machining. Lou sells the package with the seats and retainers you need. You'll also need to get the 98 valve seals.

 

As far as everything else goes, It already has new seals vie TEA. They did my head work. 5.7's milled .030, ported intake and exhaust ports, so on and so forth. I heard a horror story on a local board about a guy that broke 6 rev dual springs with the G5X2 cam. THis story leaves me wondering whether or not he heat cycled them correctly or at all. I am very meticulous on this sort of thing, and that scared the hell out of me.

 

Are you planning to fly cut your pistons. Just wandering because I see you have had your heads milled.030.

Gilbert

 

I am not planning on touching the pistons. I will get in touch with TEA or LG about clearance issues later. Will it clear? That would also be nice to know at the time.

 

I've heard some bad things about the Rev's as well, that's why I ordered the Crane duals.

 

Where is a good place to get the Crane duals?

 

I am getting mine from Thunder Racing.

 

I've heard of too many REV's breaking.

 

i broke a rev with 4000 miles. with a much smaller cam than the g5x2. i would look into the cranes or if you wanna throw up some $$$ the new comp springs.

 

Hi Guys,

Rev has come out with a new retainer that will give the springs some extra room. We give the customer a choice of REV springs, Isky, Comp or Crain. Each spring is more expensive than the REV. In the early batches of REV springs, we didn't see any problems. Just lately have we seen some REV springs break. If the car shows signs of a broken spring, and the driver does not hot rod the car to try to "make the missfire go away". then the inner spring will hold the valve up and there will be no damage.
The new Comp 921 springs are about $250 more expensive than the REVs, but they are also a dual spring that is a drop in spring good to .650 lift. For $250 extra you can get peace of mind if you think there is a problem.

We are now letting the customer decide.

Now, having said that, I took my car out with the G5X-3 cam in it with REV springs and ran it on a road race track for 400 miles of hard racing at 7000rpms and had no problems. They also had 8000 street miles on them before. I think that there might have been a bad batch somewhere in the last year that caused some problems, but they fixed it lately.

Springs are a "consumable" in a race engine.

Thanks

Lou G

 

Lou, which do you think are better springs, the Isky's or the Comp's? I only ask because I know another local shop that highly recommends the Iskys over any other spring.

 

I like the comps the best because of the true dual set up.

The Iskys are still a very good spring and can hold up to the job, but if they ever fo break, the driver has to be alert and not drive the car so there is no damage.

On our complete head packages, we are using the Comp 977s but you need to run a comp R lifter.

LG

 

Thanks Lou, I'll prolly go that route. I was planning on running Comp R lifters anyway. Also do you recommend 1.8 rockers with your G5X-2 or x-3 cams?

 

I believe with .030 milling you will run into PtoV problems.

 

You may want to reconsider your cam choice with the TEA heads. Certain cylinder heads do better with certain cams than others, you may see more power with a smaller cam than with the G5X2 or X3, IMO. Also, you will have to flycut with milled heads, there is no way around it.


No way that will work, you'll be at .640-.650 lift.

 

What is to be gained or improved by using the Comp "R" Lifters and the Comp 977 springs? That is what I went with for my Absolute Speed 5.3L's that Jay is working on.

In addition, when will the G5X3's be ready for the public.. and will the spec's be readily available, and how is the G5X3 better than the G5X2?

 

I *think* that the 977s high seat pressure can/will collapse a stock hydraulic lifter. I am not sure, its just what Jay and Lou said I needed. :worship:

As LG put it, "The G5X3 is like a G5X2 on steriods." I think theres probably 5-15hp/tq difference between the X2 and X3, but you'd have to ask Lou, hes done some actual comparisons. As far as the specs, they will probably not be readily available at first, but someone will figure them out.

 

ttt ttt