Valve spring question

Fastcar731 · 05-25-2014, 01:01 PM

ended up with a street 350 sbc and it has only run 8.20's...come to find out it has a .540 lift cam with stock valve springs....how much would it pick up if it had a set of springs that matched the cam?

Geerhead55 · 05-25-2014, 05:43 PM

The way I look at it,,,theres only one way to find out!
Danny Durham

Alan Roehrich · 05-25-2014, 05:47 PM

If those are production cylinder heads, and have never even had the valve springs changed, that won't be all that is wrong. There probably is not enough clearance between the retainer and the top of the valve guide, either. In cases like that, it is hard to say what has been damaged. If the rockers were not changed to long slot rockers or aftermarket roller rockers, I'd be surprised if the rockers had not hit the rocker studs.

Fastcar731 · 05-26-2014, 12:55 PM

Its powerglide leave on transbrake at 3000 shift at 5500 5.38 gears...(think that may be hurting it)...steel chevy 041 heads has roller rocker arms, dual plane edelbrock intake holley 750 dp, forged pistons stock bottom end...car probably 3300 pounds as well.. 69 Camaro..plenty tire..4link, def not spinning.. best 1.74 60 ft..

Eman · 05-26-2014, 04:59 PM

Stock valve springs would coil bind at that lift. There's a whole lot more going on if that's your 60' on a TB.

Fastcar731 · 05-26-2014, 08:43 PM

I figured it should be a lil better...what u think is holding it back?

05-25-2014, 01:01 PM	#1
Fastcar731 Junior Member Join Date: May 2014 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Valve spring question ended up with a street 350 sbc and it has only run 8.20's...come to find out it has a .540 lift cam with stock valve springs....how much would it pick up if it had a set of springs that matched the cam?

05-25-2014, 05:43 PM	#2
Geerhead55 VIP Member Join Date: Sep 2002 Location: Tacoma, Washington Posts: 1,632 Likes: 0 Liked 5 Times in 5 Posts	Re: Valve spring question The way I look at it,,,theres only one way to find out! Danny Durham

05-25-2014, 05:47 PM	#3
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,112 Likes: 1,570 Liked 1,818 Times in 413 Posts	Re: Valve spring question If those are production cylinder heads, and have never even had the valve springs changed, that won't be all that is wrong. There probably is not enough clearance between the retainer and the top of the valve guide, either. In cases like that, it is hard to say what has been damaged. If the rockers were not changed to long slot rockers or aftermarket roller rockers, I'd be surprised if the rockers had not hit the rocker studs. __________________ Alan Roehrich 212A G/S

05-26-2014, 12:55 PM	#4
Fastcar731 Junior Member Join Date: May 2014 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Re: Valve spring question Its powerglide leave on transbrake at 3000 shift at 5500 5.38 gears...(think that may be hurting it)...steel chevy 041 heads has roller rocker arms, dual plane edelbrock intake holley 750 dp, forged pistons stock bottom end...car probably 3300 pounds as well.. 69 Camaro..plenty tire..4link, def not spinning.. best 1.74 60 ft..

05-26-2014, 04:59 PM	#5
Eman Member Join Date: May 2014 Location: E TN Posts: 473 Likes: 16 Liked 133 Times in 76 Posts	Re: Valve spring question Stock valve springs would coil bind at that lift. There's a whole lot more going on if that's your 60' on a TB.

05-26-2014, 08:43 PM	#6
Fastcar731 Junior Member Join Date: May 2014 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Re: Valve spring question I figured it should be a lil better...what u think is holding it back?