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440 Piston ID
#2734610
01/19/20 07:11 PM
01/19/20 07:11 PM
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Joined: Mar 2010
Posts: 28 wv
73bbroadrunner
OP
member
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OP
member
Joined: Mar 2010
Posts: 28
wv
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Does anyone know who manufactures this piston? Thanks
Last edited by 73bbroadrunner; 01/19/20 07:23 PM.
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Re: 440 Piston I.D.
[Re: mr_340]
#2734917
01/20/20 02:37 PM
01/20/20 02:37 PM
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Joined: Jan 2003
Posts: 4,720 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
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X2. Trw/Speedpro. Mopar also sold them as D.C. or M.P. They give about 11.5 :1 compression with 906 heads. It's going to be a little more with most aluminum heads. I called Trw a looong time ago and asked about machining them to lower compression. They said I could safely take .090" out of the entire valve notch and the top of the dome. Don't try to take off the entire dome. Don't forget to round over the edges where you machine them. Rebalance as necessary.
Last edited by GomangoCuda; 01/20/20 02:41 PM.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: 440 Piston ID
[Re: R/T1968R/T]
#2734961
01/20/20 03:57 PM
01/20/20 03:57 PM
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Joined: Jan 2003
Posts: 14,496 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,496
So. Burlington, Vt.
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One other note...... the valve pocket isn’t very generous.
If you plan of using a fairly long duration cam....... check the clearance.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: 440 Piston ID
[Re: fast68plymouth]
#2734977
01/20/20 04:32 PM
01/20/20 04:32 PM
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Joined: Jan 2003
Posts: 4,720 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
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One other note...... the valve pocket isn’t very generous.
If you plan of using a fairly long duration cam....... check the clearance. Yep, that was the primary reason I called Trw. I needed to know how much I could take out of the notch for a big flat tappet. They threw in the info about the dome.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: 440 Piston ID
[Re: GomangoCuda]
#2735115
01/20/20 11:59 PM
01/20/20 11:59 PM
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Joined: Jan 2003
Posts: 3,504 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,504
DFW
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I had one scanned and 3D printed 1/2 of the top. The notch area was about .240" thick and under the dome was around .40" at the thinnest part. I think if you take off the whole dome you would end up around 9.5:1 compression ratio unless you have small chambers.
Floyd Lippencott IV
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