Diagnosing Valve Train Clatter
Cargo Master
Joined: Dec 2015
Posts: 2,543
Likes: 322
From: Harned, Ky
rotating the exhaust valve each time it opened and closed seated it in a different position, this helped prevent carbon hot spots that resulted in burnt valves
This was common practice in heavy duty engines
but was used on later engines to help with unleaded gas issues
Exhaust valve rotators are not used on cams with higher lifts
This was common practice in heavy duty engines
but was used on later engines to help with unleaded gas issues
Exhaust valve rotators are not used on cams with higher lifts
Laughing Gas
Joined: Dec 2020
Posts: 869
Likes: 186
From: Near my truck
'' Pretty sure the machine shop that built the motor reused the stock springs. They made the suggestion on the cam, so I would've expected them to know if different springs were required
''
I put your comment here so as not to hijack the other thread.
Your expectation was reasonable, but alas, these days, who can we really trust ?
Assuming you get a set of VS280 springs suggested previously, check the manufacturer's spring pressure at spring height before fitting them.
There's a tool available to do that.
Then you'll know for sure that they are going to behave as expected.
You took the trouble to break in your cam, so it's s shame/nuisance/annoyance that you are having problems with an engine that is only 1,500 miles old.
Also, read the instructions. It might say heat them up (engine running for 5 minutes say) and then let them cool down.
''I put your comment here so as not to hijack the other thread.
Your expectation was reasonable, but alas, these days, who can we really trust ?
Assuming you get a set of VS280 springs suggested previously, check the manufacturer's spring pressure at spring height before fitting them.
There's a tool available to do that.
Then you'll know for sure that they are going to behave as expected.
You took the trouble to break in your cam, so it's s shame/nuisance/annoyance that you are having problems with an engine that is only 1,500 miles old.
Also, read the instructions. It might say heat them up (engine running for 5 minutes say) and then let them cool down.
Thread Starter
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Laughing Gas
Joined: Aug 2010
Posts: 1,049
Likes: 230
From: Amarillo, TX
I currently have the driver side head at the machine shop(not the same one that built the motor!) where they are going to take measurements on valve height & recommend the proper springs.
Cargo Master
Joined: Dec 2015
Posts: 2,543
Likes: 322
From: Harned, Ky
Rotators won't work with the 280 springs
Hotshot
Joined: Jul 2020
Posts: 10,456
Likes: 2,630
From: Near Salt Lake City
When you order valve springs for say a small block ford
They (all 16) come the same length
The rotators will work with the factory springs on a ford and the springs are all the same length as well
The rotators were always on the exhaust valves on all manufacturers that i know of
Never heard of a different spring intake vs exhaust from any manufacturer
BMW Porsche Mercedes Ford
Valve springs all the same length when you get a set
Engines built after about 1970 here in the US have the exhaust spring seats machined deeper in the head to accommodate the valve rotators
If you loose the rotators you need to add a .100" shim under the spring seat to accommodate for the difference
Why would you not want to run the rotators anyway?
All valves are designed to rotate anyway (however most valves do not rotate as you watch them operate at idle speed)
They are designed with a slight offset where the rocker tip hits the valve and that helps to rotate them
(maybe not all of them but it is the theory they teach in Ford school)
They (all 16) come the same length
The rotators will work with the factory springs on a ford and the springs are all the same length as well
The rotators were always on the exhaust valves on all manufacturers that i know of
Never heard of a different spring intake vs exhaust from any manufacturer
BMW Porsche Mercedes Ford
Valve springs all the same length when you get a set
Engines built after about 1970 here in the US have the exhaust spring seats machined deeper in the head to accommodate the valve rotators
If you loose the rotators you need to add a .100" shim under the spring seat to accommodate for the difference
Why would you not want to run the rotators anyway?
All valves are designed to rotate anyway (however most valves do not rotate as you watch them operate at idle speed)
They are designed with a slight offset where the rocker tip hits the valve and that helps to rotate them
(maybe not all of them but it is the theory they teach in Ford school)
Cargo Master
Joined: Dec 2015
Posts: 2,543
Likes: 322
From: Harned, Ky
I'm not sure about the import engines you listed but none of the Ford engines I worked on had the exhaust seats cut lower for rotators
I looked up late 70's - 80's 351W, 351M/400, 370HD and all had exhaust vale springs that were shorter than the intake springs, this also applied to the early 80's 302HO engine.
I worked on a lot of Ford FT truck engines in the 70's -80's and it was easy to tell which valve springs were intakes and exhaust due to their different heights
I looked up late 70's - 80's 351W, 351M/400, 370HD and all had exhaust vale springs that were shorter than the intake springs, this also applied to the early 80's 302HO engine.
I worked on a lot of Ford FT truck engines in the 70's -80's and it was easy to tell which valve springs were intakes and exhaust due to their different heights
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Thread Starter
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Laughing Gas
Joined: Aug 2010
Posts: 1,049
Likes: 230
From: Amarillo, TX
Another question as I'm putting everything back together - My head bolts looked good, so is it okay to re-use them? Do any of them need any kind of thread sealant? Hope not, as I've already put them back in
But I would think I could pull & re-torque one at a time if I had to.
But I would think I could pull & re-torque one at a time if I had to.