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HOW MUCH IS TOO MUCH....??? #306493
05/03/09 03:09 PM 05/03/09 03:09 PM
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Thumperdart Offline OP
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I got my ISKY part #9365 plus series valve springs yesturday and after some carefull measuring they come in at 265 seat and 600+ open pressures. My concern is about liveable pressures on the street and how much is too much in terms of my Harland-sharp rockers and shafts. We also removed the inner spring on the new ones and replaced it w/my old inners and the pressure dropped to 230 seat and about 580 open so, which would you run? My old #`s were 200-210 seat and 525 open but my car seemed to level out on the second half of the track which is why I`m changing em out.....much appreciated.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306494
05/03/09 03:34 PM 05/03/09 03:34 PM
Joined: Jan 2004
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Saskatchewan, Canada
cudabin Offline
super stock
cudabin  Offline
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Saskatchewan, Canada
I would run both new springs. I don't think 600+ spring pressure will cause any problems as long as you don't idle too long, or set idle rpm too low...

My two cents!

Arnie

67 Cuda 8.48@ 158.7 mph 1.18 60' 2,600 DA(so far...) 70 Super Bee 440 Six Pack 4-speed. 13.2 @ 104 Stock exhaust/Street tires.
Re: HOW MUCH IS TOO MUCH....??? [Re: cudabin] #306495
05/03/09 04:09 PM 05/03/09 04:09 PM
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Thumperdart Offline OP
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Now the next issue......because these are set up for a 1.950 installed height and my rpm`s are at 1.900-1.915 the inners go into coil bind at .680 lift which my cam is. And I don`t like the idea that I can`t idle it cos after all, it IS a street car. What to do?

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306496
05/03/09 05:02 PM 05/03/09 05:02 PM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
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Central Valley, CA.
Maybe try some offset locks that increase installed height.
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306497
05/03/09 05:19 PM 05/03/09 05:19 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Look into a +.050 lock... comp 614-16
Re: HOW MUCH IS TOO MUCH....??? [Re: MR_P_BODY] #306498
05/03/09 06:02 PM 05/03/09 06:02 PM
Joined: Feb 2007
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U.S.
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moparniac Offline
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I was always under the impression that the inch lbs of the springs is what makes it more streetable or not...

Mopar Performance
Re: HOW MUCH IS TOO MUCH....??? [Re: MR_P_BODY] #306499
05/03/09 08:17 PM 05/03/09 08:17 PM
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Thumperdart Offline OP
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So, I gather you guys feel I should use the new springs and adjust the installed height instead of using the old inners and lowering the pressures. I`ll think about it for a bit and go from there.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306500
05/03/09 08:57 PM 05/03/09 08:57 PM
Joined: Nov 2004
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tjmarcus1 Offline
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Quote:

So, I gather you guys feel I should use the new springs and adjust the installed height instead of using the old inners and lowering the pressures. I`ll think about it for a bit and go from there.

definitely use the new ones i think that idle thing applies more to a flat tappet cam like us "little boys" run

Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306501
05/03/09 09:01 PM 05/03/09 09:01 PM
Joined: Sep 2008
Posts: 219
so cal
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cmcgee123 Offline
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so cal
Quote:

So, I gather you guys feel I should use the new springs and adjust the installed height instead of using the old inners and lowering the pressures. I`ll think about it for a bit and go from there.



yeah dom either cut the valve pocket or use the offset lock mr p body suggested. oh on an off note i got the 6 pt finished in the cuda and will be making some full passes at irwindale this week.

Re: HOW MUCH IS TOO MUCH....??? [Re: tjmarcus1] #306502
05/03/09 09:08 PM 05/03/09 09:08 PM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
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Quicksilver440  Offline
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Central Valley, CA.
Quote:

i think that idle thing applies more to a flat tappet cam like us "little boys" run



I'm no expert..but I agree. I don't see that idle speed or idle time should mean much with a roller.
Re: HOW MUCH IS TOO MUCH....??? [Re: tjmarcus1] #306503
05/03/09 11:26 PM 05/03/09 11:26 PM
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Thumperdart Offline OP
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Thankxx guys.......I can`t cut the valve pockets cos the heads are still on the car and I don`t plan on removing em. I run lash caps so will the keepers you guys discribe work w/those locks? I need to get this handled soon since I`m racing on the 10th. Thankxx again.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306504
05/03/09 11:39 PM 05/03/09 11:39 PM
Joined: Aug 2003
Posts: 43,202
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
Quote:

So, I gather you guys feel I should use the new springs and adjust the installed height instead of using the old inners and lowering the pressures. I`ll think about it for a bit and go from there.

I would use what ever parts you need to get the pressures even. I use 250 lbs. seat pressures and 630 lbs open on my 512 with Harland Sharp rockers for two years and 275 lbs seat and 650 lbs. open now for the last two years.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: HOW MUCH IS TOO MUCH....??? [Re: Cab_Burge] #306505
05/03/09 11:44 PM 05/03/09 11:44 PM
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Thumperdart Offline OP
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Thankxx Cab..........Now I just have to figure out how to get the inner spring out of coil bind.

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: HOW MUCH IS TOO MUCH....??? [Re: Thumperdart] #306506
05/04/09 02:18 AM 05/04/09 02:18 AM
Joined: Jan 2003
Posts: 4,152
SO. CAL.
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70blackfish Offline
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70blackfish  Offline
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if your cam lift is .680, it wont be once you have lash and deflection.

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