Is there going to be much of a difference with them. The car is only driven during the summer and sees the track 3 or 4 times a year. I have stock heads and im getting 3.73 for gears.

 

The difference will be that running the 1.7s will create some major headaches with the setup due to issues with the valvetrain geometry. I would just stick with the 1.6s and call it a day.

 

agreed I think if your worried about 1.7, then you need to just go custom cam to your specs. Like said it puts more stress on areas, that you could just avoid by getting a little bigger lift on a custom.

 

Hey Dave1980 do you have any dyno numbers or track times with your setup?? I'll be running almost the same exact setup.

 

That's an interesting theory. Care to point us to a post where somebody had "major headaches with the setup due to issues with the valvetrain geometry" using 1.7s on a 503 or a similar cam?


A hint - you won't find any.

 

well im interested since im running 1.7's and i would like a cam .. and a 503 was what i was looking at as well ..

 

I don't recall of hearing anyone getting "major headaches" using 1.7 RRs and the CC 503. Having said that, if anyone wants to do it, then I say go for it and let us know if you have any headaches. That way we'll all benefit from someone else falling on the grenade.JMHO

 

Maybe the "major" was a bit overused on my part, but I'm sure you are going to have to go through some extra consideration and planning when doing that setup due to the higher lifts. A little extra planning will be in order when choosing pushrods, springs, and there may even the possible issue with a valve contacting a piston. You may have to do the "clay method" just to make sure that the valves don't touch the pistons at all. I couldn't tell you for sure as I haven't heard of anyone running the CC503 cam with the 1.7RRs, then again, I haven't seen one here with aftermarket mild heads/cam setups and 1.7RRs, I wonder why? Maybe if someone has such a setup, then can post up their experiences and details.

 

I don't see much of anyone running 1.7rr's with anything outside solid roller, there must be good reason for it.

not sure how the additional lift will affect piston to valve clearance...

 

there are quite a few 1.7 rr,stock and aftermarket cams

 

in a ls series motors u will see 1.7 in stock or aftermarket a lot not gen 1 or gen 2 due to clearence issues

 

If there are quite a few, could you lead me to at least one or two? I'd like to learn more about this. With that said, and without knowing more about 1.7 on any LTx cam, I would play it safe and follow the masses, (1.6) rockers.

 

when it comes to things like valvetrain clearance I'd rather play it safe

 

There are plenty of people with 1.7 on stock and mild to moderate cams (up to about hotcam/503 territory). Hard to search for on this board since it won't take "1.7" as a search term.

A couple that I found right away:

http://camaross.com/forums/showthread.php?t=422491

http://web.camaross.com/forums/showp...19&postcount=4

http://www.camaross.com/forums/showthread.php?t=180122



You can also find plenty of people on other LT1 forums with 1.7s. Here's one I have bookmarked:

http://www.wku.edu/~nathan.plemons/h..._corvette.html


There have been a few people with 1.8s on stock cams, and none of them reported any serious geometry problems, either.

Lots of uninformed fearmongering here.

 

P-V problems at 230 dur / 578 lift with stock pistons & valves? I'd say you've paid as little attention to p-v posts on this board as you have to rocker ratio posts.