Just like the title says, is there anyone here with 1.7RR on their LT1? There's this guy I know on another forum. He's got a buddy that runs a shop and is looking to become a vendor for "Scorpian" 1.7RR's. Would there be any disadvantages to running these over a set of 1.6RR? I've got an LT4 Hot cam with 1.6RR. The duration is (correct me if I'm wrong) 218/228 & 525/525 Lift. What would that be if I ran 1.7's?


Anybody know who sells them? I'd like to find out some more info. I think it would be (at the very least) easier to install than a whole new cam. Cheeper too I would think......

 

The only problem with running a larger ratio rocker is the increased wear and friction associated with the larger ratio. You're better off making more lift with the cam and a smaller ratio rocker if you like parts longetivity.

But if you insist on running 1.7's to get the new lift you just divide .525 by 1.6 then multiply by 1.7 to get the new lift of ~.558.

Thunder racing sells comp 1.7 rockers at the bottom of this
link

good luck with your buildup.

 

Thanks for the link.

I was just wondering, would I need any to make any modifations to the valve covers to get the 1.7"s in or could I use the stock ones? Any other upgrades I should do aswell? Springs? Pushrods?

Assuming the new lift with the 1.7 was 558 how much power would you estamate that'd be at the wheels?

The only reason I was considering theses RR's was because I didn't want to go through the hasle of installing another cam. What would be the biggest cam I could use on my LT1 and still be relitively streetable. I use my car as a daily driver and believe me, I can put up with a lot. Drove around with open headers all summer and I loved it As long as the car doesn't stall on me at every stop light I'd be pretty happy with it.

 

Depending on what kind of 1.7's you use they will fit under the stock covers. The Scorpion ones will fit but some ppl have dented the stock covers to make sure. You will need better springs and stronger push rods.

 

With the scorpion setup, you WILL need to run pushrod guideplates as they are NON-SA. I was going to be running a set of my 224/230 car until I found I needed a new motor.

As far as people running them, do a search on here. There was a LONG thread a few months ago. I do believe that SAR2K was running them also when he was just a bolt on car.

I think the recommendation was, due to the modded valvetrain geometry, was to upgrade to 7/16" studs also.

 

hmmm, so if I used the 1.7 rockers with my stock cam then that would raise the lift to .510/.510 right? I believe the lift on the 93s was .450/.450. Would I see the same performance as doing a cam?