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Discussion Starter · #1 ·
I have a 454 bored to 4.280 and stroked to 4.25
671 blower
SRP flat tops
stock 049 heads
The springs are 120 on the seat 330 at .5 lift

the cam I have is comp 11-564-4

Dur at .050 230/244 lift .553 and .568
 

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AKA Blownjet 468
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1,206 Posts
yes, y should use them. look at the difference in height between your new springs and some stockers
 

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Discussion Starter · #3 ·
The machine shops are'nt giving me the straight scoop on my current spring tension/height set-up. i currently have. i've been to two and both are telling me different things. maybe thier spring height gauges are different?

anyhow thanks for the answer. How come only on the exhaust?
 

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E-7 Sheepdog (ret)
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6,834 Posts
The machine shops are'nt giving me the straight scoop on my current spring tension/height set-up. i currently have. i've been to two and both are telling me different things. maybe thier spring height gauges are different?

anyhow thanks for the answer. How come only on the exhaust?
I BELIEVE the origins of the rotators , exhaust only, were to help fight deposit build-up on the seats/valve seat interface.

I was told when I had my heads ported that removing them actually lowers the spring temperatures, I am unsure as to how, there may well be some aditional heat generated by the additional motion of the rotation, but, the racing shop with decades of experience, I ain't gonna argue with Denny or Saum.
They shot me straight on everything else, showed me many things in detail, measured things with me there to show me, and I could not be more pleased with the work I had done, or the education I recieved.


Spring height measuring tools should read the same, within a small ammount of error for calibration. They may be looking at it, expalining it from 2 different angles/viewpoints, and you may be missing something, or one (or both) could be full of crap, not much way to tell.
 

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steelcomp was here
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26,529 Posts
The only things that cool the valve springs is oil and heat transfer from the spring into the head. The spring rotators can act like insulators lessening the heat transfer. With the spring sitting in the spring pocket, the oil can collect around the bottom of the spring and as it flows, also carries away heat. The rotators don't let this happen either.
To maintain the proper installaed height, the rotators either need to be replaced with a thick shim or taller springs installed. If all your springs are the same height and you remove the rotators, you'll need to replace them with something.
I BELIEVE the origins of the rotators , exhaust only, were to help fight deposit build-up on the seats/valve seat interface.

I was told when I had my heads ported that removing them actually lowers the spring temperatures, I am unsure as to how, there may well be some aditional heat generated by the additional motion of the rotation, but, the racing shop with decades of experience, I ain't gonna argue with Denny or Saum.
They shot me straight on everything else, showed me many things in detail, measured things with me there to show me, and I could not be more pleased with the work I had done, or the education I recieved.


Spring height measuring tools should read the same, within a small ammount of error for calibration. They may be looking at it, expalining it from 2 different angles/viewpoints, and you may be missing something, or one (or both) could be full of crap, not much way to tell.
 

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E-7 Sheepdog (ret)
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6,834 Posts
The only things that cool the valve springs is oil and heat transfer from the spring into the head. The spring rotators can act like insulators lessening the heat transfer. With the spring sitting in the spring pocket, the oil can collect around the bottom of the spring and as it flows, also carries away heat. The rotators don't let this happen either.
To maintain the proper installaed height, the rotators either need to be replaced with a thick shim or taller springs installed. If all your springs are the same height and you remove the rotators, you'll need to replace them with something.
Makes perfect sense, thx. Steel.
 

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I didnt ask about why they where removed, just letting you know that his where.
1) many springs won't fit them (meaning dual, etc)
2) they were never meant for more than stock spring pressure, and will fail
3) same reason a bunch of other stock stuff was replaced or changed when you went to performance applications...rod bolts, timing chain sets, oil pumps, etc
Wags
 
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