Take A Look At My Graph
Take A Look At My Graph I showed this graph to another member here and he suggested that I post it up for the experts to look at as neither of us are Dyno Graph experts. The 2 graphs are open exhaust and closed exhaust. See any thing wrong here? Mods are in my signature.
Staging Lane
Joined: Feb 2010
Posts: 82
Likes: 0
what kind of springs are you running?
I personally had problems running a tfs head with harland sharp rockers. I had 660 lift springs(5K miles) with HS rockers, stock tfs valves(intake valve weighs about 110 grams)
my 383 with 225 tfs heads fast 102, big cam etc. 6 speed s60 made 450/420
I put in LS3 turned down hollow stems, fresh .675 springs and yella terra ultralight rockers, the car gained 40hp/30 tq through the entire rpm band.
through a 3 inch magnaflow it made 490/455 peak at 6400 rpm.
I personally had problems running a tfs head with harland sharp rockers. I had 660 lift springs(5K miles) with HS rockers, stock tfs valves(intake valve weighs about 110 grams)
my 383 with 225 tfs heads fast 102, big cam etc. 6 speed s60 made 450/420
I put in LS3 turned down hollow stems, fresh .675 springs and yella terra ultralight rockers, the car gained 40hp/30 tq through the entire rpm band.
through a 3 inch magnaflow it made 490/455 peak at 6400 rpm.
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what kind of springs are you running?
I personally had problems running a tfs head with harland sharp rockers. I had 660 lift springs(5K miles) with HS rockers, stock tfs valves(intake valve weighs about 110 grams)
my 383 with 225 tfs heads fast 102, big cam etc. 6 speed s60 made 450/420
I put in LS3 turned down hollow stems, fresh .675 springs and yella terra ultralight rockers, the car gained 40hp/30 tq through the entire rpm band.
through a 3 inch magnaflow it made 490/455 peak at 6400 rpm.
I personally had problems running a tfs head with harland sharp rockers. I had 660 lift springs(5K miles) with HS rockers, stock tfs valves(intake valve weighs about 110 grams)
my 383 with 225 tfs heads fast 102, big cam etc. 6 speed s60 made 450/420
I put in LS3 turned down hollow stems, fresh .675 springs and yella terra ultralight rockers, the car gained 40hp/30 tq through the entire rpm band.
through a 3 inch magnaflow it made 490/455 peak at 6400 rpm.
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Verdad Gallardo My graph was smoother than that and I was having float as pointed out to me by Shane from Thunder Racing here.
I got second opinions from some engine builders on the Chevelle board and they agreed.
On tear down I found 2 trashed lifters and 8 cam lobes which had at least some damage (a couple were chipped even). This was at only 5800rpm with stock valves and rockers.
I got second opinions from some engine builders on the Chevelle board and they agreed.
On tear down I found 2 trashed lifters and 8 cam lobes which had at least some damage (a couple were chipped even). This was at only 5800rpm with stock valves and rockers.
Staging Lane
Joined: Feb 2010
Posts: 82
Likes: 0
The spring pressures on your 660 springs compared to my 675 springs are virtually the same, only reason I replaced mine is the car was coming apart and my springs had quite a few miles on them.
I would start with the rockers and go from there, so you dont end up wasting money.
My graph was smoother than that and I was having float as pointed out to me by Shane from Thunder Racing here.
I got second opinions from some engine builders on the Chevelle board and they agreed.
On tear down I found 2 trashed lifters and 8 cam lobes which had at least some damage (a couple were chipped even). This was at only 5800rpm with stock valves and rockers.
I got second opinions from some engine builders on the Chevelle board and they agreed.
On tear down I found 2 trashed lifters and 8 cam lobes which had at least some damage (a couple were chipped even). This was at only 5800rpm with stock valves and rockers.
I would definetly take it to a shop or somewhere to get a professional opinion before you spend big money on the valvetrain. I honestly think the biggest problem is the HS rockers. You could just throw a set of stockers on there and see if it makes a difference. Or if you are planning on putting an intake on sometime down the road, do that first to make sure the intake was not the bottle neck.
The spring pressures on your 660 springs compared to my 675 springs are virtually the same, only reason I replaced mine is the car was coming apart and my springs had quite a few miles on them.
I would start with the rockers and go from there, so you dont end up wasting money.
The spring pressures on your 660 springs compared to my 675 springs are virtually the same, only reason I replaced mine is the car was coming apart and my springs had quite a few miles on them.
I would start with the rockers and go from there, so you dont end up wasting money.
