Hmmm....my cam with these would be .610/.632 . Ive got the springs to handle it, the heads to flow it are on the way, now am i going to smack a piston?

 

Awesome! I didnt want to have to take a dremel to my valve covers.

 

From what I know, chances are pretty good at that point.....I believe the general concensus is no greater than .600 on a stock head.

 

My buddy is running .608, but i agree its pushing it. New heads are milled too, which wont help since im already at .575/.595. Guess if i ever go with a new bottom end i can have the pistons cut for it.

 

If he's pulling it, more power to him. I stand corrected. On another note, isn't going over .600 pushing the "hydraulic roller" limit? Isn't that more solid roller territory?

 

i wouldnt mind getting a link to some step by step instructions on how to do the install "right"... if your willing to give um... thanks in advance...

 

Here is a good install page.
http://www.streetillusionsracing.com...ll/install.htm

 

Keep in mind piston to valve clearance won't happen at maximum lift. As a matter of fact it really tells you nothing about whether your cam is too big for your pistons. Minimum clearance will usually be at about 10 ATDC on the intake stroke. That's one reason why CC lists lift at TDC on a 106 and 110 intake centerline for their lobes. That's what you should be looking at.

Over .600" isn't a problem for hydraulic lifters if you design the lobe right.

 

Ok guys. I went ahead and orderd up the GM guide plates and the 1.7 Scorpions.. I asked for RED rockers and got Silver.. Oh well... Anyhow here is my problem.

I usually set my lash to 3/4 turn past zero. Well, I can't go any further that 1/2 turn. Any more and I hit the boss/hex on the screw in stud...

SO, how far do you guys running these 1.7's lash your rockers? My heads are a set of Stage II Aluminum heads from CMS, with ARP 3/8 studs.. I took a stud and a poly lock and measured with my calipers that for every 1/4 turn of the poly, I get about .009" of lifter preload... So at 1/2 turn I'm at .018" preload, with maybe .003-.005 clearance between the bottom of the rocker and the stud hex...

In a worse case scenario I could take the studs into work and put them onto a lathe and turn down the bottom of the hex so that the studs scew in further..

Any ideas?

-Tom

 

this really has me thinking....i wonder if i should go with a set of 1.7's on my intake side with the cc306? i was thinking of having a cam ground with a couple more degrees duration and more lift, but this would do the trick and be cheaper and easier. they say that higher ratio rockers can add a couple degrees duration, not sure how much....

so my lift on the 306 with 1.7 on the intake side and 1.6 on the exhaust side would be:

I=0.578"
E=0.576"

hmmmmm...i wonder how this would work out.......

(in case anybody is wondering, exhaust lift on a 306 with 1.7 would be 0.612". If I decide to buy a set of these, I am going to throw one on the Exhaust and make some measurements to see if I would have any clearance issues)

also, has anybody checked to see if the 1.7's line up on the valve stem correctly?

 

Hey man I would like to get the other 8 from you! Do you think I will have any problems since I am running 2.02/1.60 valves?

 

I lashed mine at 1/2 turn......

 

who is this directed at?

 

Deadcarney

 

Gotcha......