Valve covers interfering w/ springs

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Valve covers interfering w/ springs

Post  460Dave on March 15th 2014, 10:55 pm

Just installed some 1.625 springs with a 2" installed height in my P-51s. I am trying to install my FMS tall valve covers and the left most spring (when standing on the side of the engine) on both sides (at the number 4 and 5 cyl) is hitting the curved pocket area where the bolt hole is. It is preventing the valve cover from correct alignment with the bolt holes. Has anyone else run into this? What is the fix?

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Re: Valve covers interfering w/ springs

Post  c.evans on March 15th 2014, 11:00 pm

460Dave wrote:Just installed some 1.625 springs with a 2" installed height in my P-51s. I am trying to install my FMS tall valve covers and the left most spring (when standing on the side of the engine) on both sides (at the number 4 and 5 cyl) is hitting the curved pocket area where the bolt hole is.  It is preventing the valve cover from correct alignment with the bolt holes.   Has anyone else run into this?  What is the fix?

Yes, we have all run into that ever since the SCJ heads and then later the P-51 heads came out. I grind on the bolt boss and try not to break through. Others do break through and then weld a patch panel on the outside. Just deal with it and make'em fit.

Uncle Charlie

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Re: Valve covers interfering w/ springs

Post  rmcomprandy on March 15th 2014, 11:13 pm

c.evans wrote:

Yes, we have all run into that ever since the SCJ heads and then later the P-51 heads came out.  I grind on the bolt boss and try not to break through.  Others do break through and then weld a patch panel on the outside.  Just deal with it and make'em fit.

Uncle Charlie

That combination of 1.62+ inch diameter valve springs with that style SCJ type head and FRPP valve covers were not a match.
Grind the cover to get enough clearance as Charlie has said.
Before I even start, I get a 1.5" length of 1/4" inner diameter aluminum pipe welded in that valve cover space and use a longer bolt in that location. Then you can grind a whole bunch away inside for clearance and not break through.

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Re: Valve covers interfering w/ springs

Post  richter69 on March 16th 2014, 12:47 am

Grind on the covers problem solved
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Fabbed covers

Post  460Dave on March 16th 2014, 9:08 am

Do all the fabricated style covers eliminate the issue? Is the PRW cover worth looking at? I hate to spend the extra $ if it doesn't make my situation better.

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Re: Valve covers interfering w/ springs

Post  powerstrokeace on March 16th 2014, 9:21 am

I have 2 sets of the 4 1/2" tall Moroso from Kaase on the A460 heads that had to be ground down as well. Even after you think you have enough clearance the springs ra around and still has minor contact. I was rechecking mine after running the motor to warm up am lashing the valves. I even rechecked after the first race of the season and still had to do some more minor clearancing



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Re: Valve covers interfering w/ springs

Post  jasonf on March 16th 2014, 2:44 pm

Sorry miss-understood OP problem.


Last edited by jasonf on March 16th 2014, 11:13 pm; edited 1 time in total
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Re: Valve covers interfering w/ springs

Post  rmcomprandy on March 16th 2014, 3:11 pm

jasonf wrote:Felpro used to make a cork valve cover gasket that was double thick to give you that extra bit of clearance but it is quite some time since I used one. It worked well with stock valve covers after converting to adjustable rockers.

I think you are misunderstanding the problem ... a different gasket will not move the valve cover sideways.  Wink

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Re: Valve covers interfering w/ springs

Post  jasonf on March 16th 2014, 11:12 pm

rmcomprandy wrote:
jasonf wrote:Felpro used to make a cork valve cover gasket that was double thick to give you that extra bit of clearance but it is quite some time since I used one. It worked well with stock valve covers after converting to adjustable rockers.

I think you are misunderstanding the problem ... a different gasket will not move the valve cover sideways.  Wink

After re-reading it I am indeed wrong. Thanks Randy.  Embarassed 
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Re: Valve covers interfering w/ springs

Post  rmcomprandy on March 16th 2014, 11:56 pm

jasonf wrote:
rmcomprandy wrote:
jasonf wrote:Felpro used to make a cork valve cover gasket that was double thick to give you that extra bit of clearance but it is quite some time since I used one. It worked well with stock valve covers after converting to adjustable rockers.

I think you are misunderstanding the problem ... a different gasket will not move the valve cover sideways.  Wink

After re-reading it I am indeed wrong. Thanks Randy.  Embarassed 

Not wrong because what you said does indeed happen however, simply misunderstanding the problem HERE.  Cool 

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Re: Valve covers interfering w/ springs

Post  Lem Evans on March 21st 2014, 8:04 pm

This issuue did not start yesterday. Back in the '80s I had a set of the Ford M-6049-A460 heads & a set of Moroso stamped steel valve covers ....the springs chewed on the covers as mentioned.

I sanded the sharp edges & hit the afflicted area with a ball-peen hammer and moved on.


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