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Old 10-05-2009, 05:39 PM   #1
DaBu
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Default will closed chamber pistons work with open chamber heads?

I have a .070 over 454 with a large dome closed chamber piston. the head was damaged and i have a set of open chamber heads. Will a closed chamber domed pistion work with a GM open chamber head.
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Old 10-05-2009, 05:43 PM   #2
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Default Re: will closed chamber pistons work with open chamber heads?

Check it with clay. My thought would be that you will loose a bunch of compression.
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Old 10-05-2009, 05:53 PM   #3
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Default Re: will closed chamber pistons work with open chamber heads?

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Originally Posted by Collinsautomotive View Post
Check it with clay. My thought would be that you will loose a bunch of compression.

When you say bunch of compression does that mean that it would go from say 14 to 1 to 10 to 1? or?
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Old 10-05-2009, 05:55 PM   #4
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Default Re: will closed chamber pistons work with open chamber heads?

If we are talking Chevy or old TRW stuff, the piston will hit the head.
Oddly enough, the open chamber piston will usually clear a closed chamber head, but not the other way around.
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Old 10-05-2009, 05:58 PM   #5
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Default Re: will closed chamber pistons work with open chamber heads?

That seems bass ackwards??? No doubt you are correct.
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Old 10-05-2009, 06:01 PM   #6
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Default Re: will closed chamber pistons work with open chamber heads?

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Originally Posted by Mark @ Meridian Tool View Post
If we are talking Chevy or old TRW stuff, the piston will hit the head.
Oddly enough, the open chamber piston will usually clear a closed chamber head, but not the other way around.

They were a Venolia custom closed chamber piston.
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Old 10-05-2009, 06:01 PM   #7
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Default Re: will closed chamber pistons work with open chamber heads?

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Originally Posted by Mark @ Meridian Tool View Post
If we are talking Chevy or old TRW stuff, the piston will hit the head.
Oddly enough, the open chamber piston will usually clear a closed chamber head, but not the other way around.

I forgot the closed Chamber head has the valve deeper in the chamber. Still you can clay it up and see what ya get.
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Old 10-05-2009, 06:02 PM   #8
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Default Re: will closed chamber pistons work with open chamber heads?

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When you say bunch of compression does that mean that it would go from say 14 to 1 to 10 to 1? or?
without knowing a whole lot of specifics thats tough to say.
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Old 10-05-2009, 06:13 PM   #9
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Default Re: will closed chamber pistons work with open chamber heads?

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Originally Posted by DaBu View Post
They were a Venolia custom closed chamber piston.
I would mock it up to be sure but I will guess it ain't gonna work.
The good news is you can usually find open chamber TRW piston sets used
for a couple hundy or so.
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Old 10-05-2009, 06:17 PM   #10
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Default Re: will closed chamber pistons work with open chamber heads?

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Originally Posted by Mark @ Meridian Tool View Post
I would mock it up to be sure but I will guess it ain't gonna work.
The good news is you can usually find open chamber TRW piston sets used
for a couple hundy or so.

If the domes are thickenough you might be able to use a bit of milling and clearancing on the piston and a thick head gasket if the interferance isn't to bad. IIRC its only .075 difference in valve depth between the 2 anyways.
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Old 10-05-2009, 06:34 PM   #11
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Default Re: will closed chamber pistons work with open chamber heads?

Gonna lose an easy couple points of compression in that swap...probably 15-20cc worth of chamber size difference being conservative.
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