Whats the difference from 1.6 vs 1.7

[quake101]

Whats the main difference from 1.6 vs 1.7 roller rockers?

[PNY PWR]

1.7's Opens the valves more

[quake101]

Ok, If you was getting THIS cam what would you run 1.6 or 1.7 rockers and why?

[Evil95GT]

If it were *me*, I'd do 1.6s, just to be on the safe side. 1.7s are gonna cause your clearances to run REAL close. For example........the cam you're looking at has .509 lift on the in take side.......adding 1.7s would make that more like 5.38 or something. Wayyy too much. Furthermore, you'd need some pretty decent springs to handle all that. And if you don't mind my asking, why flat tappet?

[quake101]

I'm not SET on that cam. I was told on the "other site" that would be the best cam for my combo.

[Evil95GT]

Joe,
I'm not trying to change your mind or anything, I'm just an inquisitive person. What year block are you using? Are you doing a small stroker or anything like that? Hell, I had a cam not much bigger than that in my 347.

[quake101]

I'm using the stock 302 motor out of my 90gt. If you view http://www.badassmustangs.com/forums/index.php/topic,60.0.html you can see what I have planed for this winter.

[Evil95GT]

*edit*N/M the first statement. I was thinking of two totally different things*edit* What you're going to need is a hydraulic roller cam, like a Motorsport 303 series, Steeda #18 or #19, or a Crane (2031 is a good one). For what you're doing, you're not gonna spin the motor too high, and you'll wanna keep your power band between 2000 and 6000 RPM (at least I would). I had two other cars with the E303, and they were both VERY responsive above 2800.........you need a set of gears to keep it in the powerband though. I now run a Steeda #19 in the '89. I like the cam because it has a nice lopey idle, but nothing too aggressive. It has good low end, but has that "throw you back in the seat" from 2800 on up.

[quake101]

Hrmm, I'm glad I asked before I got that cam and just tossed it in. I really don't want to go with the e303 tho. I'll look at the steeda #19 and Crane2031 to see what I think. For both them cams the 1.6's would be the best combo right?

[Evil95GT]

Definitely! If you were sticking with the stock cam, I'd tell you to add the 1.7s to give it a little more. After trying a few different cams, I *would* use another E303, but it wouldn't be my first choice.

[quake101]

http://store.summitracing.com/default.asp?target=esearch.asp&N=110&Ntk=KeywordSearch&Ntt=Crane+2031&x=26&y=5 is that the crane your taking about? Well I might have to end up using the e303. I'm on a LOW budget and I can pick up a used e303 for cheap.

[Evil95GT]

That's the one, Joe.

[RIO 5.0]

I run the Steeda 19 myself.....nice little cam...its a 1.6 or was designed around that...same as the 2031, its a 1.7 cam...was made for the 94/95 Cobra as a stock replacment...

[Aussie XAXB]

I really like the look of that Crane 2031 cam, but it says fits HO motors only  Won't fit into my dinosaur.


Steve

[Lee8995]

Well lift is not as criticle as duration is when concerning V/P clearance, The ratio of the rocker arm multiplies the the size of the lobe by the ratio selected. For instance a cam with a lobe lift of .360(height of lobe beyond that of the base circle) and a rocker ratio of 1.6 will increase the lobe lift to .576. The higher rocker arm ratio would increase lobe area without actually having a larger lobe, This will increase valve speed. In certain situations its a good alternative and in other cases its a good tuning tool.

[butch86]

1/10th lol