The only real weakness for most LT1s are their careless, inexperienced owners.

 

AMEN!!!!

 

linky

 

Fixed.

 

Actually he won't gain any extra HP with the 1.7's over the 1.6's. Increasing the lift on stock heads won't gain you any extra power as the heads don't really increase in flow after .500 lift. If you had ported heads then i would agree with your statement.

 

Oh

I may try their 1.6s though, unless I find a better price. Would you happen to know of a more competitive price? Also, what makes the more pricey RRs better then the cheaper ones such as the scorpions?

 

It's not the lift that gives you the hp. It's the effective duration a 1.7 gives over the 1.6. A 1.7 rocker opens the valve quicker thereby giving you more effective duration.

Saying that 1.7 rockers don't give you more power couldn't be more asinine.

 

Thats true but the gains would be minimal. If you want more duration just get a larger cam. There is really no reason to run 1.7's in my opinion.

 

Boy, you handled that with class. Yea, I agree there won't be much hp gain but I have seen dyno proven 10 -12 hp from going from 1.5 to 1.6 rockers. It's certainly much less invasive than putting in a new cam. LS1's use them, why shouldn't we?

 

If that were true then why would people on here with really large cammed LT1s (GM847, CC306, ect) with stock heads have their lifts around .600 for the intake/exhaust instead of getting them ground with around .550 lift. They simply will make more power. 1.7s may not make much for HP than 1.6s but they won't make any less power For the price diff (none) and trying to get maximum HP 1.7s seem very logical unless your going with a big cam, then just get more lift when the cam is ordered. I'm planning on going with 1.7s this winter.

 

That is true. The stock heads don't gain in flow after .500 lift. So why increase the lift. The reason the CC306 makes lots of power is the long a$$ duration. A lot of people want the extra lift incase they add heads later on. If a head flows 200cfms at .500 lift and 200 at .600 lift is there really any point in lifting the valve open that much more? No.you would probably lose power because you have bigger valve springs and it takes more effort to open them to achieve the same flow.
Chris the dyno numbers you speak of must be going from 1.5 rockers to 1.6 roller rockers. I'm looking at a mag where they dyno 1.5 stock rockers vs 1.5 RR's and they gain 17hp on the same cam. So if you are saying that going from 1.5's to 1.6's adds another 10-12 hp thats almost 30 hp adding 1.6 roller rockers to a stock motor and i don't believe that.

 

1.7 RRs with stock heads/cam is just putting unnecessary wear and tear on the valvetrain IMO. Sure you might get a slightly more aggressive stock cam out of the deal but the fact still remains it is stock. And then when you eventually upgrade to an aftermarket cam, the RRs are useless b/c they will put the lift WAY up over where stock heads flow.

 

When you get a "free" cam there is

 

I have an upgraded cam and valvetrain going in, so I can assume it is safe for 1.7s if it is worth it.

 

Here is a good discussion from the advanced tech section on rocker arm ratios. I personally wouldn't run a 1.7 i see no reason a lot of draw backs to them. Why not sell that cam you have and get one you want it wouldn't cost to much more, or rather than buy rockers why not put that money towards headers. You would make a lot more power off of them. Here is that link. http://web.camaross.com/forums/showt...cker+arm+ratio