dual valve springs

Ed McLawhorn Jr. · 01-27-2014, 11:56 AM

Considering replacing 1.677 manley triple springs to lighter 1.5 dual springs for my super stock 520 heads. Installed height is right at 2.050 and could get it to 2" if needed. Looking for recommendations regarding PAC's, Manley, comp or others. Understanding every application is different, how many runs can one expect from the dual springs and how are the springs holding up? Wanting if possible something that would last longer than 35-40 runs.

Ed

Ed Wright · 01-27-2014, 12:04 PM

#1356 PACs, dual 1.5" diameter. Last all year on mine. Mine set up at 2.1", I have Victory retainers that are std, +.050" &. -.050" hight. I use .200" long valves, the -.050" retainers get away from rubbing my rockers.

Ed McLawhorn Jr. · 01-27-2014, 01:41 PM

thanks Ed. I was really leaning towards the PAC springs (1330 and 1356). I had thought more about the PAC 1330 spring as I don't have as much lift on my 283 (under .850). Still trying to keep coil bind close to .100. I can play with the keepers,/retainers and get installed ht close to 2.0 and end up with about 314 on seat. I too will have to deal with some .200 valves and rocker arm clearance.

Ed

Jody Lang · 01-27-2014, 02:23 PM

Which Manley spring have you been using?

Ed McLawhorn Jr. · 01-27-2014, 02:38 PM

Jody, it's a set of heads I bought used prep by layer. The spring currently on heads are the manley nextek 221447 spring. spec (350# at 2.0 installed ht.)

Ed

Mike Pearson · 01-27-2014, 03:49 PM

Ed,

We have one engine with the PAC 1.5 springs. They have held up real good Lift is just over .800 at the valve. Installed at 2.100 we get about 350 on a new set. If your spring seats are cut for the triple springs you will need their spring positioners to keep the spring located properly to the guide. we had a learning curve on that.

Jody Lang · 01-28-2014, 02:31 PM

Quote:

Originally Posted by Ed McLawhorn Jr.

Jody, it's a set of heads I bought used prep by layer. The spring currently on heads are the manley nextek 221447 spring. spec (350# at 2.0 installed ht.)

Ed

And you're only getting 35-40 runs out of the Nexteks?

I was told by a reputable Class engine builder that some have had problems with the doubles.

Weekend Racer · 01-30-2014, 09:15 PM

My pac #1356 are at 340 lbs.@2.075.Ten pull on dyno,30 pass. I don`t know if they drop again and again .Is there a safe limit ?

01-27-2014, 12:04 PM	#2
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: dual valve springs #1356 PACs, dual 1.5" diameter. Last all year on mine. Mine set up at 2.1", I have Victory retainers that are std, +.050" &. -.050" hight. I use .200" long valves, the -.050" retainers get away from rubbing my rockers. __________________ Ed Wright 4156 SS/JA

01-27-2014, 01:41 PM	#3
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 306 Likes: 3 Liked 19 Times in 17 Posts	Re: dual valve springs thanks Ed. I was really leaning towards the PAC springs (1330 and 1356). I had thought more about the PAC 1330 spring as I don't have as much lift on my 283 (under .850). Still trying to keep coil bind close to .100. I can play with the keepers,/retainers and get installed ht close to 2.0 and end up with about 314 on seat. I too will have to deal with some .200 valves and rocker arm clearance. Ed

01-27-2014, 02:23 PM	#4
Jody Lang Member Join Date: Mar 2002 Posts: 306 Likes: 28 Liked 89 Times in 28 Posts	Re: dual valve springs Which Manley spring have you been using?

01-27-2014, 02:38 PM	#5
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 306 Likes: 3 Liked 19 Times in 17 Posts	Re: dual valve springs Jody, it's a set of heads I bought used prep by layer. The spring currently on heads are the manley nextek 221447 spring. spec (350# at 2.0 installed ht.) Ed

01-27-2014, 03:49 PM	#6
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,447 Likes: 615 Liked 1,923 Times in 578 Posts	Re: dual valve springs Ed, We have one engine with the PAC 1.5 springs. They have held up real good Lift is just over .800 at the valve. Installed at 2.100 we get about 350 on a new set. If your spring seats are cut for the triple springs you will need their spring positioners to keep the spring located properly to the guide. we had a learning curve on that. __________________ Mike Pearson 2485 SS

01-27-2014, 11:56 AM	#1
Ed McLawhorn Jr. Member Join Date: Nov 2008 Posts: 306 Likes: 3 Liked 19 Times in 17 Posts	dual valve springs Considering replacing 1.677 manley triple springs to lighter 1.5 dual springs for my super stock 520 heads. Installed height is right at 2.050 and could get it to 2" if needed. Looking for recommendations regarding PAC's, Manley, comp or others. Understanding every application is different, how many runs can one expect from the dual springs and how are the springs holding up? Wanting if possible something that would last longer than 35-40 runs. Ed Last edited by Ed McLawhorn Jr.; 01-27-2014 at 11:58 AM. Reason: spelling

01-30-2014, 09:15 PM	#8
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 68 Likes: 1 Liked 1 Time in 1 Post	Re: dual valve springs My pac #1356 are at 340 lbs.@2.075.Ten pull on dyno,30 pass. I don`t know if they drop again and again .Is there a safe limit ?