2QUIK6

I noticed the LPE 211/219 cam has a much smaller base circle than the stocker and another Comp cam I have. See pic, the LPE 211 cam is the one on the top.
Just wondering what pushrod length you ended up using since it is a smaller base circle??
About to go measure for mine now, I'm figuring since its smaller it may be a little longer than stock.

ABA383

I believe you still use the stock length...I had that cam in my 383 for years and I think the PR are stock length...I don't think having a smaller base circle affects the lobe height...The lift remains the same and since the lifters ride on the lobes I would think it would have no effect on PR length, but double check that...

--Alan

96capricemgr

The base circle is the part of the lobe that the lifter rides on while the valve is on the seat, so generally a smaller base circle will require longer pushrods, BUT you NEED to check. If you do a head swap with milled heads or thin gaskets that can cause you to need a shorter pushrod, so with a small base circle, thin gaskets and some head milling you can endup right back at stock length.

2QUIK6

Forget to mention it has the bigger LE2 valves so the valve stems are .05 taller too...but I started out at 7.4 and it was off the the tip, then did 7.3 that was closer to the center, and just did 7.2 and its right on... So my thinking didn't pan out, I figured with the smaller base circle and taller valves it would req longer pr's..but maybe with the 1.6 Pro MAgs it couter acts it or something.... I'll keep shortening and see what happens.

Kevin97ss

Hard to say for sure but the BC looks the same, its just machined deeper between the lobes, possibly throwing your perception.

2QUIK6

It measures out to be about 1/4" smaller in diameter than the stocker.
Here was a thread I had posted a couple months ago when I received the cam and compared it to the stocker and a LE1.5 I have.
http://web.camaross.com/forums/showthread.php?t=533744

2QUIK6

Ok, it looks like 7.15" is going to be the perfect length for me.

speed_demon24

I have some trickflow 7.15" for sale if you are interested. Trickflows are the same exact pushrods as the comp hi-techs but with trickflows name on them.

2QUIK6

I already called up my local speedshop, they'll have them Monday, but thanks.

dangalla

please measure them, i tried to just go by what i was told by more than one person and i ended up needing to buy a new shorter set. it is time consuming but so worth it to just measure them or have someone do it

2QUIK6

Oh yes by all means you must measure, thats what I did see posts above.
I was figuring I would need longer than stock but it turns out just a tad shorter than stock looks to have the best centered pattern..was just wondering if thats what others with this cam came to the same conclusion but I guess there's too many other factors involved due to the head milling, valve stem length etc.

1racerdude

I don't think you checked them right. Do a search on the procedure or maybe Shoebox has info on his sight.
In no way would they be shorter with a smaller BC.

2QUIK6

Anything over 7.2 the pattern goes over to the lower half of the stem head. I visually saw the contact of the roller bearing also beside the marks left where the Sharpie mark was removed.
At 7.4 it was almost off the stem.
This is with the Caddy racing lifters, and I took it apart and placed a solid rod in place of the spring so there was no collasping of the lifter. Rotated crank by hand so the valve was opened twice for each mark.

What other way would there be?
Must be some of the milling of the head and thinner gasket. With the GTP6 cam it had 7.3 prs in it, but whos to say that was right since I didn't do that work.

1racerdude

http://www.mid-lift.com/INTRO-ML-BKGRND.htm

Go here.

1racerdude

Wait.
Are the pushrod cups sitting higher in the lifter or is the lifter longer than stock?