Bobby1999c5

iTrader: (1)

I have a Futral Motorsports F14 high lift can (232/234 .646/.612 lift) and I am replacing my rocker arms with the quick lift Crane 1.7's. I am running manley springs(221426) on dart 225 heads that are good for .650 lift. The thing I am concerned with is that the lift will be too much for the springs. I read how the 1.6 rocker arms are like a 1.72 and if the 1.7's are the same way, it would be more than my spring rating. What do you suggest?

Thanks,

Bobby

98RedZone

iTrader: (1)

Stock ratio is 1.7. I'm not sure if that aggressive lobe and quick lift rocker is a good idea. I'm sure someone here has done it and will chime in.

vettenuts

iTrader: (4)

Final ration on the Crane's is 1.72. Overall lift should be OK. There is more to valve springs than lift, what is your installed seat load and open load. Those are the things you need to examine.

PREDATOR-Z

I would not use those rockers with such an agressive lobe. They were certainly not designed for that. Look at Crane lobes and you'll understand why.
Either get your stock ones rebuilt by Harland Sharp or go with a standard 1.7 aftermarket not that variable lift tech.

Bobby1999c5

iTrader: (1)

The installed pressure is 140 @1.800 and open at 385 @1.150. The Rate is 377 lbs in and coil binds at 1.100.

JPH

iTrader: (2)

if you can give me lobes specs .006,.050,.200, I can see if cam motions stuff might be to aggresive for crane rockers?

Bobby1999c5

iTrader: (1)

Do you know where I could find this info? I'm not sure if I still have the cam card.

JPH

iTrader: (2)

okay, well call alan @futral he might know.

PREDATOR-Z

Good luck, I doubt he would release this info (proprietary lobes).

Look around for a Cam Dr sheet, I know Patrick G has some with the regular FM14

On these the rate is about 50 intake and 51 exhaust (XE=53 and XE-R= 49)
so the high lift must be more than that at some lifts.

I had one but the site hosting died and it is lost.

vettenuts

iTrader: (4)

Just curious, have you run this setup yet? Do you know your installed height? It appears that unless you are exactly at 1.800 you could be running those springs really tight since you only have 0.700" to coil bind if installed at exactly 1.800 and your lift is 0.649. I would also check the retainer to valve seal clearance as well if you haven't done so.

Bobby1999c5

iTrader: (1)

I am currently running with this setup. Sorry for my ignorance, but I don't know my installed height. Futral recommended these springs when I bought the cam. Are there better springs out there than can handle more than .650 lift? I emailed futral to get the specs and see if the cam would be ok with crane rocker arms but haven't received a response yet. Also, how exactly would I check retainer to valve seal clearance?

Thanks,

Bobby

vettenuts

iTrader: (4)

You need to remove the spring and measure between the bottom of the retainer and the top of the seal. If you are already running this cam/spring combination then you would know by now if it was an issue. PAC just introduces some dynamite dual springs, that I think are good to 0.700" lift. Yeahdoug is a member of LS1tech so you can shoot him a PM.

150# at 1.800"
440# at 1.100"
Coil Bind at: 1.030"
Max Lift: .700"
Spring Rate: 402#/in
Spring Weight: 95 grams
OD 1.300"